Workpiece clamping fall detection device

Abstract

The utility model proposes a workpiece clamping and falling detection device, including a frame, a clamping assembly, a slide rail, a distance measuring unit and a push rod; the clamping assembly is installed on the frame for clamping the workpiece; the slide rail is vertically installed on the frame; the distance measuring unit is slidably installed on the slide rail; the push rod is connected to the distance measuring unit, the push rod is vertically arranged, and the bottom of the push rod abuts against the upper surface of the workpiece. The push rod is vertically installed on the frame through the slide rail; the distance measuring unit is slidably installed on the slide rail; the push rod is connected to the distance measuring unit, and the bottom of the push rod abuts against the upper surface of the workpiece. When the workpiece falls, the push rod falls with the workpiece under the action of its own weight, and the bottom is kept in abutment with the upper surface of the workpiece. The falling height of the push rod is measured by the distance measuring unit, so as to obtain the falling height of the workpiece. The measurement is performed by the push rod abutting against the workpiece, and the measurement is more direct and not affected by dim light, so the accuracy can be improved.

Description

Technical Field

[0001] The utility model relates to the field of measurement technology, in particular to a workpiece clamping and falling detection device. Background Art

[0002] In machining equipment, a three-jaw chuck is generally used to clamp annular workpieces. For vertically placed workpieces, they may fall to a certain height after clamping due to their own weight or other reasons. Therefore, it is necessary to measure the falling height of the workpiece to correct the processing amount of the workpiece to ensure the processing accuracy.

[0003] In the prior art, a laser sensor is generally provided on a three-jaw chuck to measure the falling height of the workpiece. However, since the three-jaw chuck is generally covered by a protective cover and the ambient light is dim, the measurement accuracy is low. Utility Model Content

[0004] In view of this, the utility model proposes a workpiece clamping fall detection device to solve the technical problem proposed in the above background technology that a laser sensor is set on a three-jaw chuck to measure the fall height of the workpiece, but the measurement accuracy is low due to dim light.

[0005] The technical solution of the utility model is achieved in this way:

[0006] The utility model provides a workpiece clamping fall detection device, comprising a frame, a clamping assembly, a slide rail, a distance measuring unit and a mandrel, wherein:

[0007] The clamping assembly is mounted on the frame and is used to clamp the workpiece;

[0008] The slide rail is vertically mounted on the frame;

[0009] The distance measuring unit is slidably mounted on the slide rail;

[0010] The push rod is connected to the distance measuring unit, the push rod is vertically arranged, and the bottom of the push rod abuts against the upper surface of the workpiece.

[0011] On the basis of the above technical solution, preferably, it further comprises a connecting ring, wherein the connecting ring is connected to the push rod, and the distance measuring unit is connected to the connecting ring.

[0012] On the basis of the above technical solution, preferably, it also includes a guide assembly, which is fixedly mounted on the frame and is used to guide the push rod.

[0013] On the basis of the above technical solution, preferably, the guide assembly includes a support frame and a guide cylinder; the support frame is connected to the frame and the guide cylinder respectively; the guide cylinder is located below the connecting ring, and the guide cylinder is provided with a guide hole in the vertical direction, and the push rod is slidably installed in the guide hole.

[0014] On the basis of the above technical solution, preferably, it further comprises an adapter, wherein the adapter is respectively connected to the connecting ring and the distance measuring unit, so that the distance measuring unit is located between the connecting ring and the guide cylinder.

[0015] On the basis of the above technical solution, preferably, it further comprises a limiting ring, wherein the limiting ring is installed on the top rod, the limiting ring is located below the connecting ring, and the distance measuring unit is located between the limiting ring and the connecting ring.

[0016] On the basis of the above technical solution, preferably, the clamping assembly includes a motor, a transmission mechanism and a clamping member; the motor is installed on the frame; the transmission mechanism is respectively connected to the motor and the clamping member, and is used to drive the clamping member to rotate under the drive of the motor.

[0017] On the basis of the above technical solution, preferably, the transmission mechanism includes a driving gear and a driven gear; the driving gear is connected to the output shaft of the motor; the driven gear is connected to the clamping member, and the driven gear meshes with the driving gear for transmission.

[0018] On the basis of the above technical solution, preferably, the clamping assembly further includes a cylinder, which is mounted on the frame and connected to the clamping member to drive the clamping member to clamp or release the workpiece.

[0019] On the basis of the above technical solution, preferably, the distance measuring unit adopts a magnetostrictive sensor.

[0020] The workpiece clamping fall detection device of the utility model has the following beneficial effects compared with the prior art:

[0021] (1) The slide rail is vertically mounted on the frame; the distance measuring unit is slidably mounted on the slide rail; the push rod is connected to the distance measuring unit, and the bottom of the push rod abuts against the upper surface of the workpiece. When the workpiece falls, the push rod falls with the workpiece under the action of its own weight, and the bottom of the push rod is kept in abutment with the upper surface of the workpiece. The falling height of the push rod is measured by the distance measuring unit, thereby obtaining the falling height of the workpiece. The measurement is performed by abutting the workpiece with the push rod, which makes the measurement more direct and is not affected by dim light, thereby improving the accuracy.

[0022] (2) The support frame is connected to the frame and the guide cylinder respectively; the guide cylinder is located below the connecting ring, and the guide cylinder is provided with a guide hole in the vertical direction, and the push rod is slidably installed in the guide hole. The guide hole guides the sliding of the push rod, so that the push rod always remains perpendicular to the upper surface of the workpiece, thereby improving the accuracy of measurement;

[0023] (3) The limiting ring is located below the connecting ring, and the distance measuring unit is located between the limiting ring and the connecting ring. When the push rod falls, the limiting ring first contacts the guide tube, thereby protecting the distance measuring unit and improving the reliability and stability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 It is a three-dimensional diagram of the workpiece clamping and falling detection device of the utility model;

[0026] Figure 2 It is a cross-sectional view of the workpiece clamping and falling detection device of the utility model;

[0027] Figure 3 A three-dimensional diagram of the workpiece clamping and falling detection device of the utility model without the frame and the clamping assembly;

[0028] Figure 4 It is a stereoscopic diagram of the guide assembly of the present utility model.

[0029] Description of reference numerals: 100-workpiece, 1-frame, 2-clamping assembly, 3-slide rail, 4-distance measuring unit, 5-thrust rod, 6-connecting ring, 7-guide assembly, 8-adapter, 9-limiting ring;

[0030] 21-motor, 22-transmission mechanism, 221-driving gear, 222-driven gear, 23-clamping member, 24-cylinder;

[0031] 71-support frame, 72-guide cylinder, 721-guide hole. DETAILED DESCRIPTION

[0032] The following will be combined with the implementation of the utility model to clearly and completely describe the technical solutions in the implementation of the utility model. Obviously, the described implementation is only a part of the implementation of the utility model, not all of the implementations. Based on the implementation of the utility model, all other implementations obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0033] Reference Figure 1-Figure 4 As shown, the embodiment of the utility model proposes a workpiece 1 clamping and falling detection device, including a frame 1, a clamping assembly 2, a slide rail 3, a distance measuring unit 4 and a push rod 5, wherein:

[0034] The clamping assembly 2 is mounted on the frame 1 and is used to clamp the workpiece 1;

[0035] The slide rail 3 is vertically mounted on the frame 1;

[0036] The distance measuring unit 4 is slidably mounted on the slide rail 3, and the sliding direction of the distance measuring unit 4 is along the vertical direction;

[0037] The push rod 5 is connected to the distance measuring unit 4, and the push rod 5 is vertically arranged, and the bottom of the push rod 5 abuts against the upper surface of the workpiece 1. The bottom of the push rod 5 is a sharp end, and the bottom abuts against the upper surface of the workpiece 1 by point contact.

[0038] The workpiece 1 clamping fall detection device provided in the embodiment of the present application is vertically installed on the frame 1 through the slide rail 3; the distance measuring unit 4 is slidably installed on the slide rail 3; the push rod 5 is connected to the distance measuring unit 4, and the bottom of the push rod 5 abuts against the upper surface of the workpiece 1. When the workpiece 1 falls, the push rod 5 falls with the workpiece 1 under the action of its own weight, and maintains the abutment state between the bottom and the upper surface of the workpiece 1. The falling height of the push rod 5 is measured by the distance measuring unit 4, so as to obtain the falling height of the workpiece 1. The measurement is performed by abutting the push rod 5 against the workpiece 1, and the measurement is more direct, not affected by dim light, and the accuracy can be improved.

[0039] In some embodiments, the workpiece 1 clamping fall detection device further includes a connecting ring 6, the connecting ring 6 is connected to the mandrel 5, and the distance measuring unit 4 is connected to the connecting ring 6. The mandrel 5 is connected to the distance measuring unit 4 by connecting the connecting ring 6 to the mandrel 5, and the distance measuring unit 4 is connected to the connecting ring 6, so as to realize the connection between the mandrel 5 and the distance measuring unit 4. The connecting ring 6 plays a role of switching. The connecting ring 6 and the mandrel 5 are separately arranged, and the mandrel 5 has a simple structure. There is no need to carry out a complicated manufacturing process for the connecting ring 6 and the mandrel 5 as an integrated design, thereby reducing the difficulty of parts manufacturing.

[0040] In some embodiments, the workpiece 1 clamping fall detection device further includes a guide assembly 7, which is fixedly mounted on the frame 1 and is used to guide the push rod 5. The guide assembly 7 guides the sliding of the push rod 5 so that the push rod 5 always remains perpendicular to the upper surface of the workpiece 1, thereby improving the accuracy of the measurement.

[0041] In some embodiments, the guide assembly 7 includes a support frame 71 and a guide cylinder 72; the support frame 71 is connected to the frame 1 and the guide cylinder 72 respectively; the guide cylinder 72 is located below the connecting ring 6, and the guide cylinder 72 is provided with a guide hole 721 in the vertical direction, and the push rod 5 is slidably installed in the guide hole 721. The support frame 71 is connected to the frame 1 and the guide cylinder 72 respectively; the guide cylinder 72 is located below the connecting ring 6, and the guide cylinder 72 is provided with a guide hole 721 in the vertical direction, and the push rod 5 is slidably installed in the guide hole 721, and the guide hole 721 guides the sliding of the push rod 5, so that the push rod 5 always remains perpendicular to the upper surface of the workpiece 1, thereby improving the accuracy of measurement.

[0042] In some embodiments, the workpiece 1 clamping fall detection device further includes an adapter 8, and the adapter 8 is respectively connected to the connecting ring 6 and the distance measuring unit 4, so that the distance measuring unit 4 is located between the connecting ring 6 and the guide cylinder 72. The adapter 8 is L-shaped, and is respectively connected to the connecting ring 6 and the distance measuring unit 4 through the adapter 8, so that the distance measuring unit 4 is located between the connecting ring 6 and the guide cylinder 72.

[0043] In some embodiments, the workpiece 1 clamping and falling detection device further includes a limit ring 9, which is mounted on the mandrel 5, the limit ring 9 is located below the connecting ring 6, and the distance measuring unit 4 is located between the limit ring 9 and the connecting ring 6. Since the limit ring 9 is located below the connecting ring 6 and the distance measuring unit 4 is located between the limit ring 9 and the connecting ring 6, during the falling process of the mandrel 5, the limit ring 9 first contacts the guide cylinder 72, thereby protecting the distance measuring unit 4 and improving the reliability and stability of the device.

[0044] In some embodiments, the clamping assembly 2 includes a motor 21, a transmission mechanism 22 and a clamping member 23; the motor 21 is mounted on the frame 1; the transmission mechanism 22 is respectively connected to the motor 21 and the clamping member 23, and is used to drive the clamping member 23 to rotate under the drive of the motor 21. In this embodiment, after the workpiece 1 is clamped and fixed, the workpiece 1 does not rotate. Before clamping the workpiece 1, the transmission mechanism 22 is driven by the motor 21 to move, thereby driving the clamping member 23 to rotate, so as to adjust the angle of the clamping member 23, so as to facilitate clamping the workpiece 1 and improve the reliability of the device. Of course, in actual use, after the clamping member 23 clamps the workpiece 1, the motor 21 and the transmission mechanism 22 can drive the clamping member 23 to rotate, thereby driving the workpiece 1 to rotate, so as to process the workpiece 1.

[0045] In some embodiments, the transmission mechanism 22 includes a driving gear 221 and a driven gear 222; the driving gear 221 is connected to the output shaft of the motor 21; the driven gear 222 is connected to the clamping member 23, and the driven gear 222 is meshed with the driving gear 221 for transmission. The driving gear 221 is driven to rotate by the motor 21, and the driving gear 221 drives the driven gear 222 to rotate through meshing, thereby driving the clamping member 23 connected to the driven gear 222 to rotate.

[0046] In other embodiments, the transmission mechanism 22 is not limited to the above structure, and may also adopt mechanisms such as belt transmission and chain transmission.

[0047] In some embodiments, the clamping assembly 2 further includes a cylinder 24, which is mounted on the frame 1 and connected to the clamping member 23, and is used to drive the clamping member 23 to clamp or release the workpiece 1. The clamping member 23 is driven by the cylinder 24 to move, thereby clamping or releasing the workpiece 1, thereby improving the convenience of clamping.

[0048] In some embodiments, the distance measuring unit 4 uses a magnetostrictive sensor. A magnetostrictive sensor is a sensor that uses internal non-contact measurement and control technology to accurately detect the absolute position of a movable magnetic ring to measure the actual displacement value of the detected product. The measurement process is that a current pulse is generated in the electronic chamber of the sensor, and the current pulse is transmitted in the waveguide, thereby generating a circumferential magnetic field outside the waveguide. When the magnetic field intersects with the magnetic field generated by the movable magnetic ring that is sleeved on the waveguide as a position change, a strain mechanical wave pulse signal is generated in the waveguide due to the effect of magnetostriction. This strain mechanical wave pulse signal is transmitted at a fixed sound speed and is quickly detected by the electronic chamber. Since the transmission time of this strain mechanical wave pulse signal in the waveguide is proportional to the distance between the movable magnetic ring and the electronic chamber, by measuring the time, this distance can be determined with high accuracy.

[0049] In some other embodiments, the sensor distance measuring unit 4 may also adopt other distance measuring sensors such as grating sensors.

[0050] The distance measurement sensors used by the distance measurement unit 4 of the present application all adopt existing distance measurement solutions, and do not involve improvements in algorithm procedures.

[0051] The working principle of the workpiece 1 clamping and falling detection device is as follows: the bottom of the push rod 5 abuts against the upper surface of the workpiece 1. When the workpiece 1 falls, the push rod 5 falls with the workpiece 1 under the action of its own weight, and maintains the abutment state between the bottom and the upper surface of the workpiece 1. The falling height of the push rod 5 is measured by the distance measuring unit 4, thereby obtaining the falling height of the workpiece 1. By abutting the push rod 5 against the workpiece 1 for measurement, the measurement is more direct, is not affected by dim light, and can improve accuracy.

[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A workpiece clamping fall detection device, characterized in that: It includes a frame, a clamping assembly, a slide rail, a distance measuring unit and a push rod, wherein: The clamping assembly is mounted on the frame and is used to clamp the workpiece; The slide rail is vertically mounted on the frame; The distance measuring unit is slidably mounted on the slide rail; The push rod is connected to the distance measuring unit, the push rod is vertically arranged, and the bottom of the push rod abuts against the upper surface of the workpiece.

2. The workpiece clamping fall detection device according to claim 1, characterized in that: It also includes a connecting ring, which is connected to the top rod, and the distance measuring unit is connected to the connecting ring.

3. The workpiece clamping fall detection device according to claim 2, characterized in that: It also includes a guide assembly, which is fixedly mounted on the frame and is used to guide the push rod.

4. The workpiece clamping fall detection device according to claim 3, characterized in that: The guide assembly includes a support frame and a guide cylinder; the support frame is connected to the frame and the guide cylinder respectively; the guide cylinder is located below the connecting ring, and the guide cylinder is provided with a guide hole along the vertical direction, and the push rod is slidably installed in the guide hole.

5. The workpiece clamping fall detection device according to claim 4, characterized in that: It also includes an adapter, which is connected to the connecting ring and the distance measuring unit respectively, so that the distance measuring unit is located between the connecting ring and the guide cylinder.

6. The workpiece clamping fall detection device according to claim 5, characterized in that: It also includes a limiting ring, which is installed on the top rod and is located below the connecting ring. The distance measuring unit is located between the limiting ring and the connecting ring.

7. The workpiece clamping fall detection device according to claim 1, characterized in that: The clamping assembly comprises a motor, a transmission mechanism and a clamping member; the motor is mounted on the frame; the transmission mechanism is respectively connected to the motor and the clamping member, and is used to drive the clamping member to rotate under the drive of the motor.

8. The workpiece clamping fall detection device according to claim 7, characterized in that: The transmission mechanism comprises a driving gear and a driven gear; the driving gear is connected to the output shaft of the motor; the driven gear is connected to the clamping member, and the driven gear is meshed with the driving gear for transmission.

9. The workpiece clamping fall detection device according to claim 7, characterized in that: The clamping assembly also includes a cylinder, which is installed on the frame and connected to the clamping member to drive the clamping member to clamp or release the workpiece.

10. The workpiece clamping fall detection device according to any one of claims 1 to 9, characterized in that: The distance measuring unit adopts a magnetostrictive sensor.

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