A clamp for placing automatic clamps and a working method thereof

Abstract

The present invention discloses a clamp for placing automatic clamps and a working method thereof, and relates to the technical field of clamps. The invention aims to solve the problem that when the existing clamps clamp a workpiece, the clamping force of the workpiece is difficult to control, and if it is too heavy, it is easy to damage the workpiece, and if the clamping force is insufficient, it is easy to cause the workpiece to move, which affects the subsequent processing of the workpiece. A screw fixing sleeve is symmetrically fixed in the middle of one side of the mounting plate, and the screw fixing sleeve is vertically rotatably connected with positive and negative screws. The upper and lower ends of the positive and negative screws are connected with screw sleeves through threaded sleeves. A moving plate is fixed on the side of the screw sleeve away from the mounting plate, and a compensation cylinder is installed in a vertical array on the moving plate. The compensation cylinder and the moving plate are fixedly connected through a No. 1 mounting frame. A No. 1 spring telescopic rod is fixed to the lower end of the moving plate along one side of the compensation cylinder, and a clamping plate is fixed to the lower end of the No. 1 spring telescopic rod, and a clamping weighing sensor is vertically installed in the middle of the clamping plate.

Description

Technical Field

[0001] The invention relates to the technical field of clamps, in particular to an automatic clamping clamp and a working method thereof. Background Art

[0002] A fixture is a device used to fix the workpiece in the mechanical manufacturing process so that it occupies the correct position for construction or inspection. It is also called a clamp. A fixture usually consists of a positioning element (to determine the correct position of the workpiece in the fixture), a clamping device, a tool guiding element (to determine the relative position of the tool and the workpiece or to guide the direction of the tool), an indexing device (to enable the workpiece to complete the processing of several stations in one installation, and there are two types: a rotary indexing device and a linear motion indexing device), a connecting element, and a clamp body (fixture base).

[0003] However, when the existing clamps clamp the workpiece, it is difficult to control the force of the clamping workpiece. If the clamping force is too heavy, it is easy to damage the workpiece, and if the clamping force is insufficient, it is easy to cause the workpiece to move, affecting the subsequent processing of the workpiece. Therefore, it does not meet the existing needs. In this regard, we propose a clamp for automatic clamping and a working method thereof. Summary of the invention

[0004] The object of the present invention is to provide a clamp for automatic clamping and a working method thereof, so as to solve the problem that the clamping force of the existing clamps proposed in the above background technology is difficult to control when clamping the workpiece, and if it is too heavy, it is easy to cause damage to the workpiece, and if the clamping force is insufficient, it is easy to cause the workpiece to move, affecting the subsequent processing of the workpiece.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a fixture for placing automatic clamping, comprising a mounting plate, a screw fixing sleeve is symmetrically fixed to the middle part of one side of the mounting plate, the screw fixing sleeve is vertically rotatably connected to positive and negative screws, the upper and lower ends of the positive and negative screws are connected to screw sleeves through threaded sleeves, a movable plate is fixed to the side of the screw sleeve away from the mounting plate, a compensation cylinder is installed in a vertical array of the movable plate, the compensation cylinder and the movable plate are fixedly connected through a No. 1 mounting frame, a No. 1 spring telescopic rod is fixed to the lower end of the movable plate along one side of the compensation cylinder, a clamping plate is fixed to the lower end of the No. 1 spring telescopic rod, and the middle part of the clamping plate A clamping weighing sensor is installed vertically, and a compensation plate is fixed to the measuring end of the clamping weighing sensor. A No. 1 detection plate is fixed to the side of the clamping plate away from the mounting plate. A moving groove is opened on one side of the No. 1 detection plate, and a moving sleeve is slidably connected to the inner wall of the moving groove. A displacement sensor is fixed to the middle part of the top of the No. 1 detection plate, and the detection end of the displacement sensor is connected to the moving sleeve by screws. A No. 2 mounting frame is fixed in the middle of one side of the mounting plate, and a detection cylinder is installed inside the No. 2 mounting frame. A sensor mounting sleeve is fixed to one end of the piston rod of the detection cylinder, and a detection weighing sensor is installed inside the sensor mounting sleeve by screws.

[0006] Preferably, the movable sleeve is vertically slidably connected to a sliding rod, a telescopic spring is fixedly sleeved on the top of the sliding rod, and the lower end of the telescopic spring is fixedly connected to the movable sleeve.

[0007] Preferably, a No. 2 detection plate is fixed to the lower end of the sliding rod, a No. 3 spring telescopic rod is connected between the No. 1 detection plate and the No. 2 detection plate, and the bottom of the No. 2 detection plate is flush with the bottom of the compensation plate.

[0008] Preferably, a second spring telescopic rod is arranged in an array between the clamping plate and the compensation plate, and the second spring telescopic rod is fixedly connected to the clamping plate and the compensation plate.

[0009] Preferably, a connecting plate is fixed to the side of the clamping plate away from the No. 1 detection plate, and a through hole is opened on the connecting plate along the outer side of the positive and negative screw rods. Fixed plates are fixed to the upper and lower ends of one side of the No. 1 mounting plate, and the upper and lower ends of the positive and negative screw rods are rotatably connected to the fixed plate.

[0010] Preferably, one side of the mounting plate is symmetrically provided with a guide groove, the inner wall of the guide groove is slidably connected with a guide block, and one side of the guide block is fixedly connected to the screw sleeve.

[0011] Preferably, a driving motor is fixedly mounted on the bottom of one side of the mounting plate, the rotors at both ends of the driving motor are connected to driving bevel gears through keyways, the bottoms of the forward and reverse screw rods are connected to transmission bevel gears through keyways, and the transmission bevel gears are meshedly connected with the driving bevel gears.

[0012] A working method for placing an automatic clamping fixture comprises the following steps:

[0013] Step 1: Place the workpiece to be clamped and fixed between the two compensation plates. The workpiece applies pressure to the clamping weighing sensor under the action of gravity. The clamping weighing sensor senses the pressure change and converts the change into an electrical signal to transmit to the external computer. The external computer controls the driving motor. The output end of the driving motor drives the driving bevel gear to rotate. The driving bevel gear drives the forward and reverse screws to rotate through the meshing with the transmission bevel gear. The forward and reverse screws drive the two moving plates to approach each other through the meshing with the screw sleeve, thereby moving the clamping plate to clamp the workpiece.

[0014] Step 2: During the clamping process, the No. 1 spring telescopic rod, the No. 2 spring telescopic rod and the No. 3 spring telescopic rod are all contracted and deformed, the No. 2 detection plate is close to the workpiece, and pushes the slide bar to slide in the moving sleeve, thereby driving the telescopic spring to extend. During the clamping period, the pressure detected by the clamping weighing sensor increases. After the pressure detected by the clamping weighing sensor increases to a certain value and does not change, the external computer controls the drive motor to turn off and turns on the detection cylinder;

[0015] Step 3: After the detection cylinder is opened, its piston rod extends, driving the detection weighing sensor to move towards the direction of the workpiece and exerting thrust on the workpiece. The detection weighing sensor detects the thrust exerted by the detection cylinder on the workpiece. If the thrust detected by the detection weighing sensor increases to a certain value and does not change, the external computer controls the detection cylinder piston rod to stop extending;

[0016] Step 4: During the extension of the piston rod of the detection cylinder, the No. 2 detection plate is close to the workpiece. If the workpiece is firmly clamped, the position of the workpiece does not change during the extension of the piston rod of the detection cylinder, and the workpiece does not drive the No. 2 detection plate to move. The No. 2 detection plate, the slide rod and the movable sleeve have no lateral displacement, and the displacement sensor has no signal change, indicating that the workpiece is firmly clamped;

[0017] Step 5: If the displacement sensor has a signal change, it means that the workpiece is not firmly clamped. The external computer receives the electrical signal transmitted by the displacement sensor, and then controls the compensation cylinder to start. The piston rod of the compensation cylinder extends, driving the compensation plate to further close to the clamped workpiece, thereby further fixing the workpiece;

[0018] Step 6: After the subsequent processing of the workpiece is completed, the external computer controls the drive motor rotor to rotate in the opposite direction, thereby reversing the forward and reverse screws, driving the moving plate to reset. At the same time, the external computer controls the detection cylinder and compensation cylinder piston rods to retract, driving the detection weighing sensor and compensation plate to reset, releasing the clamping of the workpiece, and then the workpiece can be removed.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The present invention can drive the two moving plates to approach each other through the meshing with the screw sleeve during the rotation process by setting the positive and negative screws, so as to perform preliminary clamping on the workpiece to be clamped, thereby ensuring the basic function of the device. The No. 1 spring telescopic rod is used to connect the moving plate and the clamping plate, and plays a certain buffering and protective role, reducing the damage to the workpiece after clamping. The clamping weighing sensor is used to send an electrical signal to an external computer, thereby controlling the start and shut down of the driving motor, and can also detect the clamping condition of the clamping plate on the workpiece, so as to avoid excessive clamping pressure and damage to the workpiece. The detection cylinder and the detection weighing sensor are used to cooperate with the displacement sensor to detect whether the clamped workpiece is firmly clamped. The structures such as the moving sleeve and the displacement sensor can be used to detect whether the workpiece has a displacement change under the push of the detection cylinder. If there is a displacement change, it means that the workpiece is not firmly clamped. The compensation cylinder can be controlled to start by the external computer when the workpiece is not firmly clamped. The piston rod of the compensation cylinder extends a certain length to push the compensation plate to further clamp the workpiece, thereby improving the clamping effect of the workpiece.

[0021] 2. The telescopic spring and the third spring telescopic rod of the present invention can ensure that the second detection plate is always in close contact with the clamped workpiece, and then when the workpiece moves, the second detection plate can drive the sliding rod and the moving sleeve to produce lateral displacement, so that the displacement sensor detection signal changes, and the signal is transmitted to the external computer, thereby controlling the start of the compensation cylinder to further clamp the workpiece;

[0022] 3. The present invention uses a driving motor, a driving bevel gear and a transmission bevel gear to drive the forward and reverse screws to rotate, and the guide groove and the guide block are used to limit the screw sleeve to ensure normal engagement between the screw sleeve and the forward and reverse screws. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A perspective view of the present invention;

[0024] Figure 2 It is a front view of the present invention;

[0025] Figure 3 It is a side view of the present invention after removing the No. 1 detection plate and the structure thereon;

[0026] Figure 4 It is an enlarged view of structure A of the present invention;

[0027] Figure 5 It is an enlarged view of structure B of the present invention;

[0028] Figure 6 It is an enlarged view of the C structure of the present invention.

[0029] In the figure: 1. Mounting plate; 2. Fixed plate; 3. Guide groove; 4. Guide block; 5. Moving plate; 6. Screw sleeve; 7. Screw fixing sleeve; 8. Positive and negative screws; 9. No. 1 spring telescopic rod; 10. Clamping plate; 11. No. 1 mounting frame; 12. Compensation cylinder; 13. Connecting plate; 14. No. 2 spring telescopic rod; 15. Compensation plate; 16. Clamping weighing sensor; 17. No. 2 mounting frame; 18. Detection cylinder; 19. Sensor mounting sleeve; 20. Detection weighing sensor; 21. No. 1 detection plate; 22. Moving groove; 23. Moving sleeve; 24. Sliding rod; 25. Telescopic spring; 26. Displacement sensor; 27. No. 3 spring telescopic rod; 28. No. 2 detection plate; 29. ​​Driving motor; 30. Driving bevel gear; 31. Transmission bevel gear. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0031] See also Figure 1-6, an embodiment of the present invention: a fixture for placing automatic clamping, comprising a mounting plate 1, a screw fixing sleeve 7 is symmetrically fixed in the middle of one side of the mounting plate 1, the screw fixing sleeve 7 is vertically rotatably connected with a positive and negative screw 8, the upper and lower ends of the positive and negative screw 8 are connected with a screw sleeve 6 through a threaded sleeve, and a movable plate 5 is fixed on the side of the screw sleeve 6 away from the mounting plate 1. The arranged positive and negative screws 8 can drive the two movable plates 5 to approach each other through the engagement with the screw sleeve 6 during the rotation process, so as to perform preliminary clamping of the workpiece to be clamped to ensure the basic function of the device, and the movable plate 5 is vertically arrayed with a compensation cylinder 12, and the compensation cylinder 12 is fixedly connected to the movable plate 5 through a No. 1 mounting frame 11, and the compensation cylinder 12 can be used for workpiece clamping When it is not firm, it is started by the control of an external computer, and the piston rod of the compensation cylinder 12 extends a certain length to push the compensation plate 15 to further clamp the workpiece, thereby improving the clamping effect of the workpiece. A spring telescopic rod 9 is fixed to the lower end of the movable plate 5 along one side of the compensation cylinder 12. The spring telescopic rod 9 is used to connect the movable plate 5 and the clamping plate 10, and plays a certain buffering and protective role to reduce the damage to the workpiece after clamping. A clamping plate 10 is fixed to the lower end of the spring telescopic rod 9, and a clamping weighing sensor 16 is vertically installed in the middle of the clamping plate 10. The clamping weighing sensor 16 is used to send an electrical signal to the external computer on the one hand, thereby controlling the start and shut down of the drive motor 29, and can also detect the clamping plate 10 on the workpiece. The clamping condition is to prevent excessive clamping pressure from causing damage to the workpiece. A compensation plate 15 is fixed to the measuring end of the clamping weighing sensor 16. A No. 1 detection plate 21 is fixed to the side of the clamping plate 10 away from the mounting plate 1. A moving groove 22 is opened on one side of the No. 1 detection plate 21. A moving sleeve 23 is slidably connected to the inner wall of the moving groove 22. A displacement sensor 26 is fixed to the middle of the top of the No. 1 detection plate 21. The detection end of the displacement sensor 26 is connected to the moving sleeve 23 by screws. The structures such as the set moving sleeve 23 and the displacement sensor 26 can be used to detect whether the workpiece has displacement changes under the push of the detection cylinder 18, so as to judge whether the workpiece is firmly clamped. A No. 2 mounting frame 17 is fixed in the middle of one side of the mounting plate 1. The inside of the No. 2 mounting frame 17 A detection cylinder 18 is installed, and a sensor mounting sleeve 19 is fixed at one end of the piston rod of the detection cylinder 18. A detection weighing sensor 20 is installed inside the sensor mounting sleeve 19 by screws. The compensation cylinder 12, the clamping weighing sensor 16, the detection cylinder 18, the detection weighing sensor 20, the displacement sensor 26, and the drive motor 29 are electrically connected through an external computer. The compensation cylinder 12, the clamping weighing sensor 16, the detection cylinder 18, the detection weighing sensor 20, the displacement sensor 26, the drive motor 29 and the external computer are all prior arts and will not be elaborated here. The detection cylinder 18 and the detection weighing sensor 20 are used to cooperate with the displacement sensor 26 to detect whether the clamped workpiece is firmly clamped.

[0032] See also Figure 1 , Figure 2 , Figure 6 The movable sleeve 23 is vertically slidably connected with a slide bar 24, and a telescopic spring 25 is fixedly sleeved on the top of the slide bar 24. The lower end of the telescopic spring 25 is fixedly connected to the movable sleeve 23, and a No. 2 detection plate 28 is fixed to the lower end of the slide bar 24. A No. 3 spring telescopic rod 27 is connected between the No. 1 detection plate 21 and the No. 2 detection plate 28. The bottom of the No. 2 detection plate 28 is flush with the bottom of the compensation plate 15. The telescopic spring 25 and the No. 3 spring telescopic rod 27 can ensure that the No. 2 detection plate 28 is always in close contact with the clamped workpiece, and then when the workpiece moves, the No. 2 detection plate 28 can drive the slide bar 24 and the movable sleeve 23 to produce lateral displacement, so that the displacement sensor 26 detects the signal change, and transmits the signal to the external computer, thereby controlling the start of the compensation cylinder 12 to further clamp the workpiece.

[0033] See also Figure 1 , Figure 2 , Figure 3 , Figure 4 A No. 2 spring telescopic rod 14 is arranged in an array between the clamping plate 10 and the compensation plate 15. The No. 2 spring telescopic rod 14 is fixedly connected to the clamping plate 10 and the compensation plate 15. The arranged No. 2 spring telescopic rod 14 can prevent the clamping plate 10 and the compensation plate 15 from excessively supporting the workpiece, thereby protecting the clamped workpiece.

[0034] See also Figure 1 , Figure 2 , Figure 3 , Figure 4 A connecting plate 13 is fixed on the side of the clamping plate 10 away from the No. 1 detection plate 21. The connecting plate 13 has through holes along the outside of the forward and reverse screw rods 8. A fixing plate 2 is fixed to the upper and lower ends of one side of the No. 1 mounting plate 1. The upper and lower ends of the forward and reverse screw rods 8 are rotatably connected to the fixing plate 2. The fixing plate 2 is used to connect the forward and reverse screw rods 8 and cooperate with the mounting plate 1 to facilitate the installation of the clamp on other equipment.

[0035] See also Figure 1 , Figure 2 , Figure 3 A guide groove 3 is symmetrically provided on one side of the mounting plate 1, and a guide block 4 is slidably connected to the inner wall of the guide groove 3. One side of the guide block 4 is fixedly connected to the screw sleeve 6. The guide groove 3 and the guide block 4 are used to limit the screw sleeve 6 to ensure the normal engagement of the screw sleeve 6 with the positive and negative screws 8.

[0036] See also Figure 1 , Figure 2 , Figure 3A driving motor 29 is fixedly installed at the bottom of one side of the mounting plate 1. The rotors at both ends of the driving motor 29 are connected to the driving bevel gear 30 through keyways. The bottom of the forward and reverse screw rods 8 is connected to the transmission bevel gear 31 through keyways. The transmission bevel gear 31 is meshed with the driving bevel gear 30. The set driving motor 29, driving bevel gear 30 and transmission bevel gear 31 are used to drive the forward and reverse screw rods 8 to rotate.

[0037] A working method for placing an automatic clamping fixture comprises the following steps:

[0038] Step 1: Place the workpiece to be clamped and fixed between the two compensation plates 15. The workpiece applies pressure to the clamping weighing sensor 16 under the action of gravity. The clamping weighing sensor 16 senses the pressure change, converts the change into an electrical signal and transmits it to an external computer. The external computer controls the driving motor 29. The output end of the driving motor 29 drives the driving bevel gear 30 to rotate. The driving bevel gear 30 drives the forward and reverse screw rods 8 to rotate by meshing with the transmission bevel gear 31. The forward and reverse screw rods 8 drive the two moving plates 5 to approach each other by meshing with the screw sleeve 6, thereby moving the clamping plate 10 to clamp the workpiece.

[0039] Step 2: During the clamping process, the No. 1 spring telescopic rod 9, the No. 2 spring telescopic rod 14 and the No. 3 spring telescopic rod 27 are all contracted and deformed, the No. 2 detection plate 28 is close to the workpiece, and pushes the slide bar 24 to slide in the movable sleeve 23, thereby driving the telescopic spring 25 to extend. During the clamping period, the pressure detected by the clamping weighing sensor 16 increases. After the pressure detected by the clamping weighing sensor 16 increases to a certain value and does not change, the external computer controls the drive motor 29 to turn off and turns on the detection cylinder 18;

[0040] Step 3: After the detection cylinder 18 is opened, its piston rod extends, driving the detection weighing sensor 20 to move toward the direction of the workpiece and exerting thrust on the workpiece. The detection weighing sensor 20 detects the thrust exerted by the detection cylinder 18 on the workpiece. If the thrust detected by the detection weighing sensor 20 increases to a certain value and does not change, the external computer controls the piston rod of the detection cylinder 18 to stop extending;

[0041] Step 4: During the extension of the piston rod of the detection cylinder 18, the second detection plate 28 is close to the workpiece. If the workpiece is firmly clamped, the position of the workpiece does not change during the extension of the piston rod of the detection cylinder 18, and the workpiece will not drive the second detection plate 28 to move. The second detection plate 28, the slide bar 24 and the movable sleeve 23 have no lateral displacement, and the displacement sensor 26 has no signal change, indicating that the workpiece is firmly clamped;

[0042] Step 5: If the displacement sensor 26 has a signal change, it means that the workpiece is not firmly clamped. The external computer receives the electrical signal transmitted by the displacement sensor 26, and then controls the compensation cylinder 12 to start. The piston rod of the compensation cylinder 12 extends, driving the compensation plate 15 to further close to the clamped workpiece, thereby further fixing the workpiece;

[0043] Step 6: After the subsequent processing of the workpiece is completed, the external computer controls the drive motor 29 to rotate in the opposite direction, thereby reversing the forward and reverse screws 8, driving the movable plate 5 to reset. At the same time, the external computer controls the detection cylinder 18 and the compensation cylinder 12 to retract the piston rods, driving the detection weighing sensor 20 and the compensation plate 15 to reset, thereby releasing the clamping of the workpiece, and then the workpiece can be removed.

[0044] Working principle: When in use, the workpiece to be clamped and fixed is placed between the two compensation plates 15. The workpiece applies pressure to the clamping weighing sensor 16 under the action of gravity. The clamping weighing sensor 16 senses the pressure change and converts the change into an electrical signal to be transmitted to an external computer. The external computer controls the driving motor 29. The output end of the driving motor 29 drives the driving bevel gear 30 to rotate. The driving bevel gear 30 drives the forward and reverse screw rods 8 to rotate through the engagement with the transmission bevel gear 31. The forward and reverse screw rods 8 drive the two moving plates 5 to approach each other through the engagement with the screw rod sleeve 6, thereby moving the clamping plate 10 to clamp the workpiece. During the clamping process, The spring telescopic rod 9, the second spring telescopic rod 14 and the third spring telescopic rod 27 are all contracted and deformed, the second detection plate 28 is close to the workpiece, and pushes the slide bar 24 to slide in the movable sleeve 23, thereby driving the telescopic spring 25 to extend. During the clamping period, the pressure detected by the clamping weighing sensor 16 increases. After the pressure detected by the clamping weighing sensor 16 increases to a certain value and does not change, the external computer controls the drive motor 29 to close and open the detection cylinder 18. After the detection cylinder 18 is opened, its piston rod extends, driving the detection weighing sensor 20 to move in the direction close to the workpiece and applying thrust to the workpiece to detect the weighing. The sensor 20 detects the thrust applied by the detection cylinder 18 to the workpiece. If the thrust detected by the detection weighing sensor 20 increases to a certain value and does not change, the external computer controls the detection cylinder 18 piston rod to stop extending. During the extension of the detection cylinder 18 piston rod, the second detection plate 28 is close to the workpiece. If the workpiece is firmly clamped, the position of the workpiece does not change during the extension of the detection cylinder 18 piston rod, and the workpiece will not drive the second detection plate 28 to move. The second detection plate 28, the sliding rod 24 and the movable sleeve 23 have no lateral displacement, and the displacement sensor 26 has no signal change, indicating that the workpiece is firmly clamped. If the displacement sensor 26 has a signal The signal changes, indicating that the workpiece is not firmly clamped. The external computer receives the electrical signal transmitted by the displacement sensor 26, and then controls the compensation cylinder 12 to start. The piston rod of the compensation cylinder 12 extends, driving the compensation plate 15 to further close to the clamped workpiece, thereby further fixing the workpiece. After the subsequent processing of the workpiece is completed, the external computer controls the drive motor 29 rotor to rotate in the opposite direction, thereby reversing the forward and reverse screw rods 8, driving the moving plate 5 to reset. At the same time, the external computer controls the detection cylinder 18 and the compensation cylinder 12 piston rods to retract, driving the detection weighing sensor 20 and the compensation plate 15 to reset, thereby releasing the clamping of the workpiece, and the staff can remove the workpiece.

[0045] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A fixture for placing automatic clamps, comprising a mounting plate (1), characterized in that: A screw fixing sleeve (7) is symmetrically fixed in the middle of one side of the mounting plate (1), and the screw fixing sleeve (7) is vertically rotatably connected to a positive and negative screw (8), and the upper and lower ends of the positive and negative screw (8) are connected to a screw sleeve (6) through a threaded sleeve, and a movable plate (5) is fixed on the side of the screw sleeve (6) away from the mounting plate (1), and a compensation cylinder (12) is vertically arrayed on the movable plate (5), and the compensation cylinder (12) and the movable plate (5) are fixedly connected through a No. 1 mounting frame (11), and a No. 1 spring telescopic rod (9) is fixed at the lower end of the movable plate (5) along one side of the compensation cylinder (12), and a clamping plate (10) is fixed at the lower end of the No. 1 spring telescopic rod (9), and a clamping plate (10) is vertically installed in the middle of the clamping plate (10). A weighing sensor (16), a compensation plate (15) is fixed to the measuring end of the clamping weighing sensor (16), a first detection plate (21) is fixed to the side of the clamping plate (10) away from the mounting plate (1), a moving groove (22) is opened on one side of the first detection plate (21), a moving sleeve (23) is slidably connected to the inner wall of the moving groove (22), a displacement sensor (26) is fixed to the middle of the top of the first detection plate (21), the detection end of the displacement sensor (26) is connected to the moving sleeve (23) by screws, a second mounting frame (17) is fixed to the middle of one side of the mounting plate (1), a detection cylinder (18) is installed inside the second mounting frame (17), and a sensor is fixed to one end of the piston rod of the detection cylinder (18) The sensor installation sleeve (19) is provided with a detection weighing sensor (20) installed inside the sensor installation sleeve (19) by screws. The movable sleeve (23) is vertically slidably connected with a slide rod (24). The top of the slide rod (24) is fixedly sleeved with a telescopic spring (25). The lower end of the telescopic spring (25) is fixedly connected to the movable sleeve (23). A second detection plate (28) is fixedly provided at the lower end of the slide rod (24). A third spring telescopic rod (27) is connected between the first detection plate (21) and the second detection plate (28). The bottom of the second detection plate (28) is flush with the bottom of the compensation plate (15). A second spring telescopic rod (14) is arranged in an array between the clamping plate (10) and the compensation plate (15). The retracted rod (14) is fixedly connected to the clamping plate (10) and the compensation plate (15); a connecting plate (13) is fixedly connected to the side of the clamping plate (10) away from the No. 1 detection plate (21); a through hole is opened on the connecting plate (13) along the outer side of the forward and reverse screw rods (8); a fixing plate (2) is fixedly connected to the upper and lower ends of one side of the mounting plate (1); the upper and lower ends of the forward and reverse screw rods (8) are rotatably connected to the fixing plate (2); a driving motor (29) is fixedly installed at the bottom of one side of the mounting plate (1); the rotors at both ends of the driving motor (29) are connected to driving bevel gears (30) through keyways; a transmission bevel gear (31) is connected to the bottom of the forward and reverse screw rods (8) through keyways; and the transmission bevel gear (31) is meshingly connected to the driving bevel gear (30); The working method of placing the automatic clamping fixture comprises the following steps: Step 1: Place the workpiece to be clamped and fixed between two compensation plates (15). The workpiece applies pressure to the clamping weighing sensor (16) under the action of gravity. The clamping weighing sensor (16) senses the pressure change and converts the change into an electrical signal and transmits it to an external computer. The external computer controls the driving motor (29). The output end of the driving motor (29) drives the driving bevel gear (30) to rotate. The driving bevel gear (30) drives the forward and reverse screw rods (8) to rotate by meshing with the transmission bevel gear (31). The forward and reverse screw rods (8) drive the two moving plates (5) to approach each other by meshing with the screw rod sleeve (6), thereby moving the clamping plate (10) to clamp the workpiece. Step 2: During the clamping process, the first spring telescopic rod (9), the second spring telescopic rod (14) and the third spring telescopic rod (27) are all contracted and deformed, the second detection plate (28) is close to the workpiece, and pushes the slide bar (24) to slide in the movable sleeve (23), thereby driving the telescopic spring (25) to extend. During the clamping period, the pressure detected by the clamping weighing sensor (16) increases. After the pressure detected by the clamping weighing sensor (16) increases to a certain value and does not change, the external computer controls the drive motor (29) to turn off and turns on the detection cylinder (18); Step 3: After the detection cylinder (18) is opened, its piston rod extends, driving the detection weighing sensor (20) to move in a direction close to the workpiece and exert a thrust on the workpiece. The detection weighing sensor (20) detects the thrust exerted by the detection cylinder (18) on the workpiece. If the thrust detected by the detection weighing sensor (20) increases to a certain value and does not change, the external computer controls the piston rod of the detection cylinder (18) to stop extending; Step 4: During the extension of the piston rod of the detection cylinder (18), the second detection plate (28) is in close contact with the workpiece. If the workpiece is firmly clamped, the position of the workpiece does not change during the extension of the piston rod of the detection cylinder (18), and the workpiece does not drive the second detection plate (28) to move. The second detection plate (28), the sliding rod (24) and the movable sleeve (23) all have no lateral displacement, and the displacement sensor (26) has no signal change, indicating that the workpiece is firmly clamped; Step 5: If the displacement sensor (26) has a signal change, it means that the workpiece is not firmly clamped. The external computer receives the electrical signal transmitted by the displacement sensor (26), and then controls the compensation cylinder (12) to start. The piston rod of the compensation cylinder (12) extends, driving the compensation plate (15) to further close to the clamped workpiece, thereby further fixing the workpiece; Step 6: After the subsequent processing of the workpiece is completed, the external computer controls the drive motor (29) to rotate in the opposite direction, thereby reversing the forward and reverse screws (8) and driving the movable plate (5) to reset. At the same time, the external computer controls the piston rods of the detection cylinder (18) and the compensation cylinder (12) to retract, driving the detection weighing sensor (20) and the compensation plate (15) to reset, thereby releasing the clamping of the workpiece, and then the workpiece can be removed.

2. The automatic clamping fixture according to claim 1, characterized in that: A guide groove (3) is symmetrically provided on one side of the mounting plate (1) in the upper and lower parts, a guide block (4) is slidably connected to the inner wall of the guide groove (3), and one side of the guide block (4) is fixedly connected to the screw sleeve (6).

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