CN212227975U

CN212227975U - U-shaped beam measuring device capable of automatically adjusting measuring position

Info

Publication number: CN212227975U
Application number: CN202020814853.XU
Authority: CN
Inventors: 李学明; 刘振堂; 宋洪勇
Original assignee: Jinan Kaifeng Cnc Machinery Co ltd
Current assignee: Jinan Kaifeng Cnc Machinery Co ltd
Priority date: 2020-05-16
Filing date: 2020-05-16
Publication date: 2020-12-25
Anticipated expiration: 2030-05-16

Abstract

A U-shaped beam measuring device capable of automatically adjusting a measuring position comprises a movable measuring device and a fixed measuring device which are arranged on two sides of a measured U-shaped beam workpiece, and is characterized in that the movable measuring device comprises a movable bottom plate and a movable bottom plate automatic position adjusting mechanism which are arranged on a welding bracket I, and an air cylinder push-pull measuring mechanism arranged on the movable bottom plate; the fixed measuring device comprises a fixed bottom plate and a cylinder push-pull measuring mechanism arranged on the fixed bottom plate.

Description

U-shaped beam measuring device capable of automatically adjusting measuring position

Technical Field

This scheme relates to a measuring device, especially relates to a non-contact induction formula U-shaped roof beam position measurement device that can automatic adjustment position.

Background

In the prior art, two main schemes are adopted for a mechanism for measuring the surface position of a workpiece. First, a conventional non-contact position detecting device is to detect a sensing area corresponding to a surface of an object by using one or more sensor heads, and then transmit the detected value to a control system for compensating a machining accuracy of a workpiece. The non-contact detection mode has the advantages of high detection precision, long service life, simple structure and the like, and has the defect of higher requirement on the cleanliness of the surface of the workpiece. In actual operation sites, it is difficult to ensure complete cleaning of the workpiece surface. Once the surface of the workpiece to be detected is stained with particles, the real data of the surface of the workpiece to be detected cannot be obtained even if the accuracy of the sensor is higher. Second, a displacement sensing detection device with a fixed detection length. Generally, a movable induction magnet is fixed at one end of a movable rigid component, and the other end of the rigid component is closely contacted with the surface of a workpiece to be detected. The measuring device enhances the anti-interference capability of the measuring system. However, the disadvantage is that the measuring range of the displacement sensing device is fixed. For workpieces of various specifications, particularly workpieces to be detected with large section size change, if the measuring range of the displacement sensing detection device is insufficient, the use requirement cannot be met, and once the limit stroke is exceeded, the expensive displacement sensing detection device is easily damaged by the workpieces.

SUMMERY OF THE UTILITY MODEL

In view of the above problems, the present application discloses a non-contact inductive U-beam position measuring device that can automatically adjust a displacement sensing detection device.

A U-shaped beam measuring device capable of automatically adjusting a measuring position comprises a movable measuring device and a fixed measuring device which are arranged on two sides of a measured U-shaped beam workpiece, wherein the movable measuring device comprises a movable bottom plate and a movable bottom plate automatic position adjusting mechanism which are arranged on a welding bracket I, and an air cylinder push-pull measuring mechanism arranged on the movable bottom plate; the fixed measuring device comprises a fixed bottom plate and a cylinder push-pull measuring mechanism arranged on the fixed bottom plate.

The automatic position adjusting mechanism of the movable bottom plate is characterized by comprising a bearing seat fixedly arranged on an installation surface of the welding bracket I and a position adjusting sliding block of the movable bottom plate, wherein a position adjusting guide rail of the movable bottom plate is fixedly arranged on the movable bottom plate, and the position adjusting guide rail of the movable bottom plate is in sliding fit with the position adjusting sliding block of the movable bottom plate; a screw bearing is fixedly arranged in the bearing seat, and the screw bearing supports the precision ball screw to enable the precision ball screw to pivot relative to the screw bearing. A nut seat is fixed on the bottom surface of the movable bottom plate, a screw nut is arranged in the nut seat, and the screw nut is sleeved on a precision ball screw; still be provided with the motor mounting panel on welding stent I, the fixed servo motor that is provided with on the motor mounting panel, the fixed synchronous pulley that is provided with on the servo motor output shaft, also be provided with synchronous pulley at accurate ball tip, the package has synchronous cingulum on two synchronous pulleys, and servo motor passes through synchronous cingulum drive accurate ball and screw nut, makes the screw seat drive the removal bottom plate, and then drives the cylinder push-and-pull measuring mechanism that is located the removal bottom plate and make reciprocal linear motion in the horizontal direction.

Two movable bottom plate position adjusting slide blocks are provided.

The cylinder push-pull measuring mechanism on the movable bottom plate comprises a cylinder push-pull sliding block which is inversely and fixedly arranged on the movable bottom plate, and a cylinder push-pull guide rail is arranged on the cylinder push-pull sliding block. The cylinder push-pull guide rail and the cylinder push-pull sliding block slide in a matching way. The movable bottom plate is fixedly provided with an air cylinder, and a piston rod of the air cylinder is fixedly locked with a lug which is convexly arranged at the front end of the guide rail connected with the rear seat. The two ends of the cylinder push-pull guide rail are fixedly provided with a guide rail connection front seat and a guide rail connection rear seat, and the guide rail connection front seat is fixedly provided with a pressing beam roller. The guide rail is connected with the rear end of the rear seat and is fixedly provided with an induction magnet. And a displacement sensor is fixedly arranged at the rear part of the mounting surface on the movable bottom plate. The induction magnet is arranged above the displacement sensor, and a certain gap is arranged between the induction magnet and the displacement sensor.

Fixed measuring device is including fixed two sets of push-and-pull guide rails and the L type locating piece that sets up on welding stent II, the left side that lies in two sets of push-and-pull guide rails on welding stent II is provided with the boss, left end at push-and-pull guide rail is provided with the step face, the locating surface I and the boss terminal surface of L type locating piece are pasted really, the locating surface II and the push-and-pull guide rail front end face of L type locating piece closely paste really, the lower surface of L type locating piece compresses tightly with push-and-pull guide rail's outstanding upper surface, fixed PMKD that sets up. And a cylinder push-pull measuring mechanism is fixedly arranged on the fixed bottom plate.

The cylinder push-pull measuring mechanism on the fixed bottom plate comprises a cylinder push-pull sliding block which is inversely and fixedly arranged on the fixed bottom plate, and a cylinder push-pull guide rail is arranged on the cylinder push-pull sliding block; the cylinder push-pull guide rail and the cylinder push-pull sliding block slide in a matching way; the fixed bottom plate is fixedly provided with an air cylinder, and a piston rod of the air cylinder is fixedly locked with a lug which is convexly arranged at the front end of the guide rail connected rear seat; a guide rail connection front seat and a guide rail connection rear seat are fixedly arranged at two ends of the cylinder push-pull guide rail, and a pressing beam roller is fixedly arranged on the guide rail connection front seat; the guide rail is connected with the rear end of the rear seat and is fixedly provided with an induction magnet; a displacement sensor is fixedly arranged at the rear part of the mounting surface on the fixed bottom plate; the induction magnet is arranged above the displacement sensor, and a certain gap is arranged between the induction magnet and the displacement sensor.

The utility model has the advantages that: the utility model discloses automatic U-shaped roof beam measuring device of adjustment measuring position is the displacement sensing detection device with fixed detection length, sets up on one set of mechanism that can the automatic adjustment position, compares according to work piece specification size change information and current position, and control system sends the position adjustment instruction, makes displacement sensing detection device arrive the assigned position to this solves the not enough problem of range. And the induction magnet is arranged at one end of a set of cylinder push-pull measuring mechanism, and the other end of the induction magnet is tightly attached to the tested U-shaped beam through the pressing beam roller, so that even if large granular pollutants exist on the surface of the U-shaped beam, the force of the push-pull cylinder can be enough to collide the U-shaped beam, and the problem of interference of the pollutants on the sensor is solved. This novel detection scheme gets strong and mends the weak point, not only can guarantee to detect the precision, presses close to production reality, convenient to use, reliable moreover more. The method mainly comprises the following steps: the automatic position adjusting mechanism comprises a displacement sensor, a servo motor, a precise ball screw, a linear guide rail, a slide block, a synchronous toothed belt, a belt wheel and the like, and the air cylinder push-pull measuring mechanism comprises an air cylinder, an air cylinder push-pull slide block, an air cylinder push-pull guide rail, a guide seat, an induction magnet, a pressing beam roller and the like.

The invention comprises a measuring device 1 capable of automatically adjusting the position of the width change side of a U-shaped beam, a fixed measuring device 2 positioned on the guide reference side of the U-shaped beam, and a measured U-shaped beam workpiece 3, and is a position measuring device for identifying the position deviation of the measuring point of the U-shaped beam by changing the position of a displacement sensor and pushing an induction magnet by using an air cylinder to obtain the position relative to the displacement sensor. The device has the advantages of automatic adjustment of the measuring position, strong anti-interference capability, high precision, long service life, exquisite structure and the like, and can meet the position detection requirements of various U-shaped beam section specifications.

Drawings

Fig. 1 is a schematic view of the overall layout of the present invention. Fig. 2 is a top view of fig. 1. Fig. 3 is an M-direction view in fig. 1. Fig. 4 is a partial view E of fig. 2. Fig. 5 is a sectional view a-a in fig. 1. Fig. 6 is a sectional view B-B in fig. 2. Fig. 7 is a partial view F of fig. 6. Fig. 8 is a cross-sectional view C-C of fig. 2. Fig. 9 is a partial view G in fig. 8.

Wherein: 1-moving the measuring device; 2-fixing the measuring device; 3-tested U-shaped beam workpiece; 4-U-shaped beam guide datum plane; 5-positioning surface I; 6-positioning surface II; 7-support ear; 8-boss; 101-a cylinder mounting plate; 102-cylinder mounting nut; 103-vertical plate; 104-rail coupling rear seats; 105-cylinder push-pull slide block; 106-moving the bottom plate; 107-pressing beam roller shaft; 108-nut and washer; 109-spacer; 110-cylinder push-pull guide rail; 111-a fixed base plate; 112-a displacement sensor; 113-lead screw bearings; 114-a cylinder; 115-guide rail coupling front seat; 116-press beam roller; 117-washer; 118-an induction magnet; 119-cylinder push-pull measuring mechanism guide rail; 120-moving the bottom plate position adjusting slider; 121-a servo motor; 122-precision ball screw; 123-synchronous pulley; 124-synchronous toothed belt; 125-welding bracket I; 126-motor mounting plate; 127-a pulley gland; 128-nut seat; 129-screw nut; 130-a buffer block; 131-a bearing gland; 132-a bearing seat; 133-a locking nut; 134-screws and washers; 201-welding a bracket II; 202-a positioning block; 203-push-pull guide rail; 204-screw washer.

Detailed Description

As shown in fig. 1-3, a U-beam measuring device capable of automatically adjusting a measuring position comprises a mobile measuring device 1 and a fixed measuring device 2 which are arranged on two sides of a measured U-beam workpiece 3, wherein the mobile measuring device 1 comprises a mobile bottom plate 106 and a mobile bottom plate automatic position adjusting mechanism which are arranged on a welding bracket I125, and a cylinder push-pull measuring mechanism which is arranged on the mobile bottom plate 106; the fixed measuring device comprises a fixed bottom plate 111 and a cylinder push-pull measuring mechanism arranged on the fixed bottom plate 111. The fixed measuring device 2 comprises two groups of push-pull guide rails 203 arranged on the welding bracket II 201, a fixed bottom plate 111 is fixedly arranged on the push-pull guide rails 203, and an air cylinder push-pull measuring mechanism is fixedly arranged on the fixed bottom plate 111.

The movable measuring device 1 at the width change side of the U-shaped beam and the fixed measuring device 2 at one side of the U-shaped beam guide datum plane 4 are distributed at two sides of the U-shaped beam workpiece 3 to be measured. Wherein, the tested U-shaped beam workpiece 3 has various specifications of the cross section of the web. And setting the minimum ventral surface section width of the tested U-shaped beam workpiece 3 as L and the maximum ventral surface section width as S. The adjustment range of the surface position of the movement measuring device 1 on the side of the U-beam width change should be a value greater than or equal to (S-L).

As shown in fig. 3 and 6, the automatic position adjustment mechanism for the movable base plate includes a bearing seat 132 fixedly disposed on the mounting surface of the welding bracket i 125 and a position adjustment slider 120 for the movable base plate, a position adjustment guide 119 for the movable base plate is fixedly disposed on the movable base plate 106, and the position adjustment guide 119 for the movable base plate is slidably engaged with the position adjustment slider 120 for the movable base plate; a screw bearing 113 is fixedly provided in the bearing housing 132, and the screw bearing 113 supports the precision ball screw 122 to be pivotable with respect to the screw bearing 113. A nut seat 128 is fixed on the bottom surface of the movable bottom plate 106, a screw nut 129 is arranged in the nut seat 128, and the screw nut 129 is sleeved on the precision ball screw 122; a motor mounting plate 126 is further arranged on the welding support I125, a servo motor 121 is fixedly arranged on the motor mounting plate 126, a synchronous belt pulley 123 is fixedly arranged on an output shaft of the servo motor 121, the synchronous belt pulley 123 is also arranged at the end part of the precision ball screw 122, a synchronous toothed belt 124 is wound on the two synchronous belt pulleys 123, and the servo motor 121 drives the precision ball screw 122 and a screw nut 129 through the synchronous belt pulley 124, so that the screw seat 128 drives the movable bottom plate 106, and further drives the cylinder push-pull measuring mechanism on the movable bottom plate 106 to do reciprocating linear motion in the horizontal direction. The number of the moving base plate position adjusting sliders 120 is two.

As shown in fig. 7, the lock nut 133, washer 117 and bearing gland 131 are shaft end stops for the precision ball screw 122. The buffer block 130 plays a role of buffering and limiting when the lead screw nut 129 moves back. The pulley gland 127, screws, and washers 134 are used for axial restraint of the upper and lower synchronous pulleys 123.

As shown in fig. 6, the cylinder push-pull measuring mechanism on the movable base plate 106 includes a cylinder push-pull slider 105 fixed on the movable base plate 106 in an inverted manner, and a cylinder push-pull guide rail 110 provided on the cylinder push-pull slider 105. The cylinder push-pull guide rail 110 is matched with the cylinder push-pull sliding block 105 to slide. An air cylinder 114 is fixedly arranged on the movable bottom plate 106, and the piston rod of the air cylinder is fixedly locked with a support lug 7 which is convexly arranged at the front end of the guide rail connection rear seat 104. A guide rail connection front seat 115 and a guide rail connection rear seat 104 are fixedly arranged at two ends of the cylinder push-pull guide rail 110, and a pressure beam roller 116 is fixedly arranged on the guide rail connection front seat 115. The guide rail is connected with the rear end of the rear seat 104, and an induction magnet 118 is fixedly arranged at the rear end. A displacement sensor 112 is fixedly provided on the movable base plate 106 at the rear of the mounting surface. The induction magnet 118 is located above the displacement sensor 112 with a gap therebetween.

The pressure beam roller 116 is inserted into the pressure beam roller shaft 107, and is fitted into a mounting hole provided at the front end of the rail coupling front base 115 together with the spacer 109, and is locked by using a nut and washer 108.

As shown in fig. 6, a cylinder mounting plate 101 and a vertical plate 103 are fixedly provided on a movable base plate 106, a circular hole is provided on the upper portion of the cylinder mounting plate 101, and an avoidance hole is provided on the lower portion. One end of the cylinder barrel of the cylinder 114 is sleeved into a circular hole at the upper part of the cylinder mounting plate 101 and is locked by using a cylinder mounting nut 102. The other end of the cylinder barrel of the cylinder 114 passes through the opening on the upper part of the vertical plate 103 and is locked by a cylinder mounting nut 102 arranged on the front end surface of the vertical plate 103. The guide rail is coupled to the rear seat 104 and may pass through an escape hole below the cylinder mounting plate 101.

As shown in FIG. 4, the cylinder 114 fixes and locks two ends of the cylinder with the vertical plate 103 and the cylinder mounting plate 101 through the cylinder mounting nut 102, the piston rod of the cylinder 114 is initially in an extended state, when it retracts, the piston rod drives the guide rail to connect with the rear seat 104 and simultaneously drives the cylinder push-pull guide rail 110 to slide in the slider 105, and the front end of the cylinder push-pull guide rail 110 drives the guide rail to connect with the front seat 115 and the pressing beam roller 116 installed in the front end mounting hole to move together until the pressing beam roller 116 is tightly attached to the tested U-shaped beam workpiece 3. When the section of the tested U-shaped beam workpiece 3 changes, the pressing beam roller 116 drives the guide rail to be connected with the front seat 115, the cylinder to push and pull the guide rail 110 and the guide rail to be connected with the rear seat 104, and drives the induction magnet 118 to move. Thus, the variation of the cross section is equal to the variation of the relative movement between the induction magnet 118 and the displacement sensor 112, so that the deviation of the cross section from the theoretical cross section dimension at each position can be detected in real time and transmitted to the control system for error compensation.

As shown in fig. 2 and 8, the U-beam guides the fixed measuring device 2 on one side of the reference surface 4. As shown in fig. 8, the fixed measuring device 2 includes two sets of push-pull guide rails 203 and an L-shaped positioning block 202 which are arranged on the welding bracket ii 201, a boss 8 is arranged on the left side of the two sets of push-pull guide rails 203 on the welding bracket ii 201, a step surface is arranged at the left end of the push-pull guide rails 203, a positioning surface i 5 of the L-shaped positioning block 202 is closely attached to the end surface of the boss 8, a positioning surface ii 6 of the L-shaped positioning block 202 is closely attached to the front end surface of the push-pull guide rails 203, and the lower surface of the L-shaped positioning block 202 is tightly pressed against the. After the surfaces of the L-shaped positioning block 202 and the push-pull guide rail 203 are attached tightly, the L-shaped positioning block and the push-pull guide rail are respectively and fixedly connected to the welding bracket II 201. Further, the fixed base plate 111 is fixed to the push-pull rail 203. A cylinder push-pull measuring mechanism is fixedly arranged on the fixed bottom plate 111. Through the arrangement, all degrees of freedom of the fixed bottom plate 111 and the air cylinder push-pull measuring mechanism on the fixed bottom plate are restrained, and the precision of the air cylinder push-pull measuring mechanism can be kept.

As shown in fig. 9, a screw washer 204 fixedly couples the push-pull rail 203 with the base plate 111. The two push-pull guide rails 203, the fixed base plate 111 and all mechanisms thereon are arranged on the mounting upper planes on two sides of the welding bracket II 201, and form a positioning structure capable of being pulled and slid together with the L-shaped positioning block 202. The L-shaped positioning block 202 is provided to define both the horizontal position of the push-pull rail 203 and the vertical position of the push-pull rail 203 on the lower end surface thereof.

As shown in fig. 2, the cylinder push-pull measuring mechanism on the fixed base plate 111 includes a cylinder push-pull slider 105 that is fixed on the fixed base plate 111 in an inverted manner, and a cylinder push-pull guide rail 110 that is disposed on the cylinder push-pull slider 105. The cylinder push-pull guide rail 110 is matched with the cylinder push-pull sliding block 105 to slide. An air cylinder is fixedly arranged on the fixed bottom plate 111, and a piston rod of the air cylinder is fixedly locked with a support lug which is arranged at the front end of the guide rail connection rear seat 104 in a protruding mode. A guide rail connection front seat 115 and a guide rail connection rear seat 104 are fixedly arranged at two ends of the cylinder push-pull guide rail 110, and a pressure beam roller 116 is fixedly arranged on the guide rail connection front seat 115. The guide rail is connected with the rear end of the rear seat 104, and an induction magnet 118 is fixedly arranged at the rear end. A displacement sensor 112 is fixedly provided on the fixed base plate 111 at the rear of the mounting surface. The induction magnet 118 is located above the displacement sensor 112 with a gap therebetween.

In summary, the control system sends a control command to the automatic bottom plate position adjusting mechanism in advance according to the actual parameters of the current measured U-beam workpiece 3, so that the moving bottom plate of the moving measurement device 1 moves to the designated position. Then, the movable measuring device 1 and the cylinder push-pull measuring mechanism of the fixed measuring device 2 on the two sides of the measured U-shaped beam workpiece 3 tightly press the beam pressing roller 116 and the surface of the workpiece together. When the measured U-shaped beam workpiece 3 moves along the length direction, the beam pressing rollers 116 of the two side movable measuring devices 1 and the fixed measuring devices 2 are tightly attached to the measured U-shaped beam workpiece 3 under the action of the air cylinder 114 and other components. The change value of the section size of the U-shaped beam workpiece 3 to be measured is converted into a parameter change value caused by the motion of the induction magnet 118 relative to the displacement sensor 112, so that the actual numerical value of a certain section of the U-shaped beam is obtained, the measurement of the sections of the U-shaped beam at different positions is completed, and the purpose of stably providing accurate high-precision compensation data for subsequent operation is achieved.

Claims

1. A U-shaped beam measuring device capable of automatically adjusting a measuring position comprises a movable measuring device and a fixed measuring device which are arranged on two sides of a measured U-shaped beam workpiece, and is characterized in that the movable measuring device comprises a movable bottom plate and a movable bottom plate automatic position adjusting mechanism which are arranged on a welding bracket I, and an air cylinder push-pull measuring mechanism arranged on the movable bottom plate; the fixed measuring device comprises a fixed bottom plate and a cylinder push-pull measuring mechanism arranged on the fixed bottom plate.

2. A U-shaped beam measuring device capable of automatically adjusting the measuring position according to claim 1, wherein the automatic position adjusting mechanism of the movable base plate comprises a bearing seat fixedly arranged on the mounting surface of the welding bracket I and a position adjusting slider of the movable base plate, a position adjusting guide rail of the movable base plate is fixedly arranged on the movable base plate, and the position adjusting guide rail of the movable base plate is in sliding fit with the position adjusting slider of the movable base plate; a screw bearing is fixedly arranged in the bearing seat, and supports the precision ball screw to enable the precision ball screw to pivot relative to the screw bearing; a nut seat is fixed on the bottom surface of the movable bottom plate, a screw nut is arranged in the nut seat, and the screw nut is sleeved on a precision ball screw; still be provided with the motor mounting panel on welding stent I, the fixed servo motor that is provided with on the motor mounting panel, the fixed synchronous pulley that is provided with on the servo motor output shaft, also be provided with synchronous pulley at accurate ball tip, the package has synchronous cingulum on two synchronous pulleys, and servo motor passes through synchronous cingulum drive accurate ball and screw nut, makes the screw seat drive the removal bottom plate, and then drives the cylinder push-and-pull measuring mechanism that is located the removal bottom plate and make reciprocal linear motion in the horizontal direction.

3. A U-beam measuring device for automatically adjusting a measuring position according to claim 2, wherein there are two movable base plate position adjusting sliders.

4. A U-shaped beam measuring device with an automatically adjusted measuring position according to claim 1, wherein the cylinder push-pull measuring mechanism on the movable bottom plate comprises a cylinder push-pull slider which is fixedly arranged on the movable bottom plate in an inverted manner, and a cylinder push-pull guide rail is arranged on the cylinder push-pull slider; the cylinder push-pull guide rail and the cylinder push-pull sliding block slide in a matching way; a cylinder is fixedly arranged on the movable bottom plate, and a piston rod of the cylinder is fixedly locked with a lug which is convexly arranged at the front end of the guide rail connected with the rear seat; a guide rail connection front seat and a guide rail connection rear seat are fixedly arranged at two ends of the cylinder push-pull guide rail, and a pressing beam roller is fixedly arranged on the guide rail connection front seat; the guide rail is connected with the rear end of the rear seat and is fixedly provided with an induction magnet; a displacement sensor is fixedly arranged at the rear part of the mounting surface on the movable bottom plate; the induction magnet is arranged above the displacement sensor, and a certain gap is arranged between the induction magnet and the displacement sensor.

5. The U-shaped beam measuring device capable of automatically adjusting the measuring position according to claim 1, wherein the fixed measuring device comprises two sets of push-pull guide rails and an L-shaped positioning block which are fixedly arranged on a welding bracket II, a boss is arranged on the welding bracket II on the left side of the two sets of push-pull guide rails, a step surface is arranged at the left end of the push-pull guide rails, a positioning surface I of the L-shaped positioning block is tightly attached to the end surface of the boss, a positioning surface II of the L-shaped positioning block is tightly attached to the front end surface of the push-pull guide rails, the lower surface of the L-shaped positioning block is tightly pressed against the protruded upper surface of the push-pull.

6. A U-shaped beam measuring device with an automatically adjusted measuring position according to claim 1, wherein the cylinder push-pull measuring mechanism on the fixed base plate comprises a cylinder push-pull slider which is fixedly arranged on the fixed base plate in an inverted manner, and a cylinder push-pull guide rail is arranged on the cylinder push-pull slider; the cylinder push-pull guide rail and the cylinder push-pull sliding block slide in a matching way; the fixed bottom plate is fixedly provided with an air cylinder, and a piston rod of the air cylinder is fixedly locked with a lug which is convexly arranged at the front end of the guide rail connected rear seat; a guide rail connection front seat and a guide rail connection rear seat are fixedly arranged at two ends of the cylinder push-pull guide rail, and a pressing beam roller is fixedly arranged on the guide rail connection front seat; the guide rail is connected with the rear end of the rear seat and is fixedly provided with an induction magnet; a displacement sensor is fixedly arranged at the rear part of the mounting surface on the fixed bottom plate; the induction magnet is arranged above the displacement sensor, and a certain gap is arranged between the induction magnet and the displacement sensor.