1. The utility model provides a numerical control spring grinding machine of self-adaptation adjustment emery wheel clearance which characterized in that: the spring grinding machine comprises a detection unit arranged corresponding to a grinding wheel of a spring grinding machine, wherein the detection unit feeds back the detected distance between the upper grinding wheel surface and the lower grinding wheel surface to a control system in real time, and the control system controls a driving mechanism to adjust the gap between the upper grinding wheel surface and the lower grinding wheel surface in real time so as to keep the gap between the upper grinding wheel surface and the lower grinding wheel surface as a set value.

2. The numerical control spring grinding machine capable of adaptively adjusting the clearance of the grinding wheel according to claim 1, characterized in that: the detection unit comprises a first infrared distance meter and a third infrared distance meter which are arranged corresponding to two sides of the lower grinding wheel, and a second infrared distance meter and a fourth infrared distance meter which are arranged corresponding to two sides of the upper grinding wheel.

3. The numerical control spring grinding machine capable of adaptively adjusting the clearance of the grinding wheel as claimed in claim 2, wherein: first infrared distancer, second infrared distancer, third infrared distancer and fourth infrared distancer all install at fixed position.

4. The numerical control spring grinding machine capable of adaptively adjusting the clearance of the grinding wheel according to claim 1, characterized in that: the control system adopts a PLC system.

5. The numerical control spring grinding machine capable of adaptively adjusting the clearance of the grinding wheel according to claim 1, characterized in that: the driving mechanism adopts a servo motor.

6. A method for adjusting the clearance of a grinding wheel in a self-adaptive manner is characterized by comprising the following steps:

determining the clearance between the upper surface and the lower surface of the grinding wheel to be H0 through trial grinding;

arranging the detection device 1 and the detection device 2 on the same side of the grinding wheel, wherein the distance between the detection device 1 and the detection device 2 is constant S12, the distance value from the detection device 1 to the lower grinding wheel surface is dynamically changed S1, and the distance value from the detection device 2 to the upper grinding wheel surface is dynamically changed S2;

arranging the detection device 3 and the detection device 4 on the other side of the grinding wheel, wherein the distance between the detection device 3 and the detection device 4 is constant S34, the distance value to the lower grinding wheel surface detected by the detection device 3 is dynamically changed S3, and the distance value to the upper grinding wheel surface detected by the detection device 4 is dynamically changed S4;

the above detection devices feed back the measured data S1, S2, S3 and S4 to the control system in real time, and

by the control system according to the formula: s0 is 0.5 (S1+ S2+ S3+ S4-S12-S34), and the actual distance value S0 between the upper and lower grinding wheel surfaces is calculated;

comparison of S0 with the upper and lower grinding wheel face standard clearance H0 is made by the control system:

when S0 is larger than H0, the upper grinding wheel and the lower grinding wheel are close to each other until the gap between the surfaces of the upper grinding wheel and the lower grinding wheel is adjusted to the standard gap; and when the S0 is smaller than H0, the upper grinding wheel and the lower grinding wheel are separated until the clearance between the upper grinding wheel surface and the lower grinding wheel surface is adjusted to be the standard clearance.

7. The numerical control spring grinding machine capable of adaptively adjusting the gap of the grinding wheel according to claim 6, wherein: the detection devices all adopt infrared distance measuring instruments.

8. The numerical control spring grinding machine capable of adaptively adjusting the gap of the grinding wheel according to claim 6, wherein: the control system adopts a PLC system.

9. The numerical control spring grinding machine capable of adaptively adjusting the gap of the grinding wheel according to claim 6, wherein: the position of the grinding wheel is adjusted by a driving mechanism controlled by a control system.

10. The numerical control spring grinding machine capable of adaptively adjusting the gap of the grinding wheel according to claim 9, wherein: the driving mechanism adopts a servo motor.

Background

The spring grinding machine grinds the end face of the spring to enable the height and the finish degree of the spring to meet the process requirements. The spring quality control device is a key device in the spring production process, and the precision of the spring quality control device directly determines the quality of the spring. However, the processing precision of the existing spring grinding machine is difficult to guarantee along with the abrasion of the grinding wheel. For example, if the clearance between the upper surface and the lower surface of the grinding wheel is determined to be H0 through trial grinding, the free height of the processed spring is the median L0 of the process requirement. And (3) recording the gaps of the upper grinding wheel surface and the lower grinding wheel surface as H1, H2 and H3. every processing period, and recording the free heights of the processed springs as L1 and L2. Because of the abrasion of the grinding wheel, H0 < H1 < H2 … causes the height of the processed spring to be gradually increased: l0 < L1 < L2 …, which results in large fluctuation of the free height of the spring and influences the processing quality and efficiency of the spring. Although the prior art has a design of adding a clearance compensation function on a spring grinding machine, the clearance increase caused by grinding wheel abrasion is counteracted by setting a compensation amount, for example, the grinding wheel loss is 0.1mm after the machining cycle is finished, and the grinding wheel returns to a set height of-0.1 mm before the next machining cycle is started so as to achieve an ideal state that the grinding wheel clearance is kept unchanged.

Disclosure of Invention

In view of this, the invention provides a numerical control spring grinding machine and an adjusting method for adaptively adjusting the clearance of a grinding wheel, aiming at overcoming the defects in the prior art.

In order to achieve the purpose, the technical scheme of the invention is realized as follows:

a numerical control spring grinding machine capable of adaptively adjusting the gap between grinding wheels comprises a detection unit arranged corresponding to the grinding wheels of the spring grinding machine, wherein the detection unit feeds back the detected distance between the upper grinding wheel surface and the lower grinding wheel surface to a control system in real time, the control system controls a driving mechanism to adjust the gap between the upper grinding wheel surface and the lower grinding wheel surface in real time, and the gap between the upper grinding wheel surface and the lower grinding wheel surface is always kept as a set value.

Further, the detecting unit comprises a first infrared distance meter and a third infrared distance meter which are arranged corresponding to two sides of the lower grinding wheel, and a second infrared distance meter and a fourth infrared distance meter which are arranged corresponding to two sides of the upper grinding wheel, wherein the first infrared distance meter and the second infrared distance meter are arranged on the same side, and the third infrared distance meter and the fourth infrared distance meter are arranged on the same side.

Furthermore, first infrared distance meter, second infrared distance meter, third infrared distance meter and fourth infrared distance meter all install at fixed position, and each distance meter does not all produce the position change along with the emery wheel wearing and tearing promptly, the accurate measurement emery wheel surface wearing and tearing volume of being convenient for.

Further, the control system adopts a PLC system.

Furthermore, the driving mechanism adopts a servo motor, the servo motor drives the upper grinding wheel and/or the lower grinding wheel to move, so that the distance between the upper grinding wheel and the lower grinding wheel is increased or reduced, linear adjustment control is formed, the gap between the upper grinding wheel and the lower grinding wheel is linearly adjusted, and the machining precision of the spring is ensured.

A method for adjusting the clearance of a grinding wheel in a self-adaptive manner comprises the following steps:

determining the clearance between the upper surface and the lower surface of the grinding wheel to be H0 through trial grinding;

arranging the detection device 1 and the detection device 2 on the same side of the grinding wheel, wherein the distance between the detection device 1 and the detection device 2 is constant S12, the distance value from the detection device 1 to the lower grinding wheel surface is dynamically changed S1, and the distance value from the detection device 2 to the upper grinding wheel surface is dynamically changed S2;

arranging the detection device 3 and the detection device 4 on the other side of the grinding wheel, wherein the distance between the detection device 3 and the detection device 4 is constant S34, the distance value to the lower grinding wheel surface detected by the detection device 3 is dynamically changed S3, and the distance value to the upper grinding wheel surface detected by the detection device 4 is dynamically changed S4;

the detection devices feed back the measured data S1, S2, S3 and S4 to the control system in real time, and

by the control system according to the formula: s0 is 0.5 (S1+ S2+ S3+ S4-S12-S34), and the actual distance value of the current upper grinding wheel surface and the current lower grinding wheel surface is calculated;

and comparing the standard clearance H0 between the S0 and the upper and lower grinding wheel surfaces by the control system, when S0 is larger than H0, enabling the upper and lower grinding wheels to approach until the clearance between the upper and lower grinding wheel surfaces is adjusted to the standard clearance, and when S0 is smaller than H0, enabling the upper and lower grinding wheels to be far away until the clearance between the upper and lower grinding wheel surfaces is adjusted to the standard clearance.

Furthermore, the detection devices all adopt infrared distance measuring instruments.

Further, the control system adopts a PLC system.

Further, a drive mechanism controlled by the control system adjusts the position of the grinding wheel.

Further, the driving mechanism adopts a servo motor.

Compared with the prior art, the invention has the following advantages:

the invention uses the infrared distance meter to detect the clearance between the upper and lower grinding wheel surfaces in real time, so that the clearance between the upper and lower grinding wheel surfaces can be always automatically controlled at a set value no matter how the loss of the grinding wheel changes, better processing quality can be obtained, and the operation of manual adjustment is also saved.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the invention without limitation. In the drawings:

FIG. 1 is a schematic diagram of the structural arrangement of a detecting unit in the invention;

fig. 2 is a schematic diagram of a grinding wheel clearance adjusting method in an embodiment of the invention.

Detailed Description

It should be noted that the embodiments and features of the embodiments of the present invention may be combined with each other without conflict.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings, which are merely for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be construed as limiting the invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the invention, the meaning of "a plurality" is two or more unless otherwise specified.

In the description of the invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted", "connected" and "connected" are to be construed broadly, e.g. as being fixed or detachable or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the creation of the present invention can be understood by those of ordinary skill in the art through specific situations.

The invention will be described in detail with reference to the following embodiments with reference to the attached drawings.

A numerical control spring grinding machine capable of adaptively adjusting the gap between grinding wheels is disclosed, as shown in figure 1, and comprises a detection unit arranged corresponding to the grinding wheels of the spring grinding machine, wherein the detection unit feeds back the detected distance to an upper grinding wheel surface 1 and the detected distance to a lower grinding wheel surface 2 to a control system in real time, the control system controls a driving mechanism to adjust the gap between the upper grinding wheel surface and the lower grinding wheel surface in real time, and the gap between the upper grinding wheel surface and the lower grinding wheel surface is always kept as a set value.

The detection unit comprises a first infrared distance meter 3 and a third infrared distance meter 4 which are arranged corresponding to two sides of the lower grinding wheel, a second infrared distance meter 5 and a fourth infrared distance meter 6 which are arranged corresponding to two sides of the upper grinding wheel, the first infrared distance meter is arranged on the same side as the second infrared distance meter, and the third infrared distance meter is arranged on the same side as the fourth infrared distance meter.

As shown in fig. 1 and 2, the first infrared distance meter 3 and the third infrared distance meter 4 are respectively used for detecting surface loss amounts of the left and right sides of the lower grinding wheel (distance between the lower grinding wheel surface and the corresponding distance meter is changed), and the second infrared distance meter 5 and the fourth infrared distance meter 6 are respectively used for detecting surface loss amounts of the left and right sides of the upper grinding wheel (distance between the upper grinding wheel surface and the corresponding distance meter is changed).

Above-mentioned first infrared distance meter, second infrared distance meter, third infrared distance meter and fourth infrared distance meter all install at fixed position, and each infrared distance meter all does not produce the position change along with the emery wheel wearing and tearing to the accurate measurement emery wheel surface wearing and tearing volume of being convenient for. In an optional embodiment, in order to ensure the adjustment reliability of the upper grinding wheel and the lower grinding wheel of the numerical control spring grinding machine, the limiting mechanisms for limiting the maximum displacement of the grinding wheels can be respectively arranged at the left end and the right end of the upper grinding wheel and the lower grinding wheel, under the condition of normal work, the limiting mechanisms do not participate in production, once a structural part or a control system breaks down, the safety of the spring grinding machine is improved due to the limiting effect of the limiting mechanisms, the upper grinding wheel and/or the lower grinding wheel cannot move to a range beyond the limit of the limiting mechanisms, so that not only are production accidents reduced, but also waste products are reduced to a certain extent, and the reliability of equipment is higher.

When the specific structure is arranged, the limiting mechanism can comprise limiting parts which are respectively arranged above and below the corresponding grinding wheel. The arrangement form of the limiting part structure corresponding to the upper grinding wheel is that the position of the limiting part above the upper grinding wheel is generally slightly higher than the upper edge of the primary installation position of the upper grinding wheel by 2-5mm, and the distance between the limiting part below the upper grinding wheel and the lower edge of the primary installation position of the upper grinding wheel is generally the total wear value of the grinding wheel when the limit wear of the upper grinding wheel needs to be replaced. The arrangement form of the limiting part structure corresponding to the lower grinding wheel is that the position of the limiting part below the lower grinding wheel is generally slightly lower than the upper edge of the primary installation position of the lower grinding wheel by 2-5mm, and the distance between the limiting part above the lower grinding wheel and the lower edge of the primary installation position of the lower grinding wheel is generally the total wear value of the grinding wheel when the limit wear of the lower grinding wheel needs to be replaced. Above-mentioned structural design can effectively avoid interfering and the interference between the emery wheel between emery wheel and other structures, guarantee safety in production.

For example, the limiting member may be a fixedly installed limiting member, and the grinding wheel is prevented from damaging the structural member of the device or the workpiece between the two grinding wheels by a mechanical limiting manner. In addition, the position limiting part can also adopt a position sensor (such as a proximity switch), an alarm device is independently installed on each position sensor, and when the position sensor detects that the grinding wheel reaches the set limit position, the alarm device gives an alarm to remind a worker to process in time. The alarm device is not generally connected with a control system of the spring grinding machine and is an independent detection and control unit, and the alarm device is independent of a main control system of the equipment, so that the alarm device can still play normal functions and functions even if the main control system fails, and the reliability is high.

In another alternative embodiment, the upper detection device includes 2 infrared distance meters corresponding to different positions of the upper grinding wheel surface and 1 infrared distance meter corresponding to at least one side surface of the upper grinding wheel, and the lower detection device includes 2 infrared distance meters corresponding to different positions of the lower grinding wheel surface and 1 infrared distance meter corresponding to at least one side surface of the lower grinding wheel. The specific position of the infrared distance measuring instrument arranged corresponding to the side surface of the grinding wheel is not limited as long as the infrared distance measuring instrument does not influence and interfere with the infrared distance measuring instruments for detecting the upper and lower grinding wheel surfaces.

It should be noted that the infrared distance meter arranged corresponding to the side surface of the grinding wheel can be further connected with a buzzing alarm device, and when the deviation of the grinding wheel exceeds a set value, the buzzing alarm device is triggered to alarm so as to prompt a worker to process in time.

The effect of the infrared distance measuring instruments arranged on the upper surface and the lower surface of the grinding wheel is the same as that of the embodiment, and the infrared distance measuring instruments arranged on the side surfaces of the grinding wheel can detect the deviation of the grinding wheel in real time, avoid the conditions of dislocation, serious partial eccentric wear and the like of the grinding wheel, and improve the reliability of equipment.

The control system adopts a PLC system, adopts a conventional control system in the prior art, can receive the real-time feedback of the infrared distance meter, and sends out an instruction to control the action of the driving mechanism. The driving mechanism adopts a servo motor, the servo motor drives the upper grinding wheel and/or the lower grinding wheel to move, the distance between the upper grinding wheel and the lower grinding wheel is increased or reduced, linear adjustment control is formed, the gap between the upper grinding wheel and the lower grinding wheel is linearly adjusted, and the machining precision of the spring is ensured.

An adjusting method for adaptively adjusting the clearance of a grinding wheel is shown in fig. 2:

determining the clearance between the upper surface and the lower surface of the grinding wheel to be H0 through trial grinding;

arranging a detection device 1 (a first infrared distance meter) and a detection device 2 (a second infrared distance meter) on the same side of the grinding wheel, wherein the distance between the detection device 1 and the grinding wheel is constant S12, the distance value from the detection device 1 to the lower grinding wheel surface is dynamically changed S1, and the distance value from the detection device 2 to the upper grinding wheel surface is dynamically changed S2;

arranging a detection device 3 (a third infrared distance meter) and a detection device 4 (a fourth infrared distance meter) on the other side of the grinding wheel, wherein the distance between the detection device 3 and the grinding wheel is constant S34, the distance value from the detection device 3 to the lower grinding wheel surface is dynamically changed S3, and the distance value from the detection device 4 to the upper grinding wheel surface is dynamically changed S4;

the detection devices feed back the measured data S1, S2, S3 and S4 to the control system in real time, and the control system feeds back the data to the control system according to the formula:

S0＝0.5*(S1+S2+S3+S4-S12-S34)，

calculating to obtain the actual distance value of the upper grinding wheel surface and the lower grinding wheel surface;

and comparing S0 with the standard clearance H0 of the upper and lower grinding wheel surfaces by the control system, when S0 is larger than H0, enabling the upper and lower grinding wheels to approach until the clearance of the upper and lower grinding wheel surfaces is adjusted to the standard clearance, and when S0 is smaller than H0, enabling the upper and lower grinding wheels to be far away until the clearance of the upper and lower grinding wheel surfaces is adjusted to the standard clearance. The four infrared distance measuring instruments are used for respectively measuring the surface change of the grinding wheel at the corresponding position, and the device has no complex logic control, high reliability and good stability.

The detection device adopts the infrared distance measuring instrument, can accurately measure the distance between the instrument and the grinding wheel surface, and because the infrared distance measuring instrument is fixed on the installation position, when the grinding wheel is worn, the position of the grinding wheel surface is changed, and then the change can be detected by the infrared distance measuring instrument in real time and is fed back to the control system. Generally, the control system adopts a PLC system, and after receiving the numerical information of the infrared distance meter, sends a command to control the driving mechanism to operate.

The position of the grinding wheel is adjusted by a driving mechanism controlled by a control system, and the adjusting displacement of the grinding wheel is accurately controlled according to the numerical difference between S0 and H0, wherein one set of driving mechanism can be respectively arranged on the upper grinding wheel and the lower grinding wheel, or a certain grinding wheel is fixed, while the other set of driving mechanism is arranged on the other grinding wheel to drive the single-side grinding wheel to adjust the position.

The driving mechanism is, for example, a servo motor, for example, a linear motor. A servo cylinder or an electric push rod can be adopted, and the action of driving the grinding wheel can be realized.

The invention uses the infrared distance meter to detect the clearance between the upper and lower grinding wheel surfaces in real time, so that the clearance between the upper and lower grinding wheel surfaces can be always automatically controlled at a set value no matter how the abrasion loss of the grinding wheel changes, better processing quality can be obtained, the operation of manual adjustment is also saved, the labor amount of workers is saved, the production efficiency is improved, and the product quality is also reliably ensured.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the invention, so that any modifications, equivalents, improvements and the like, which are within the spirit and principle of the present invention, should be included in the scope of the present invention.