Clamping detection method and device suitable for multi-specification thin-wall parts

Abstract

The invention discloses a clamping detection method and device suitable for multi-specification thin-wall parts, and belongs to the field of machine tool machining. Two cavities of an oil cylinder communicate with a main oil way through a first oil way and a second oil way correspondingly, and the first oil way is provided with a first flow switch and a first pressure switch; a second flow switch and a second pressure switch are arranged on the second oil way, when the pressure in the first oil way reaches a preset value, the first pressure switch generates a signal, and when hydraulic oil in the first oil way flows towards the rod cavity, the first flow switch generates a signal; when the pressure in the second oil way reaches a preset value, the second pressure switch generates a signal, and when hydraulic oil in the second oil way flows to the rodless cavity, the second flow switch generates a signal; the clamping mode and the clamping state are comprehensively judged through signals of the first flow switch, the first pressure switch, the second flow switch and the second pressure switch, and on the premise that deformation of the thin-wall part during clamping can be prevented, the clamping device is suitable for thin-wall parts of different specifications, and trial production does not need to be carried out.

Description

Technical Field

[0001] The invention relates to the field of machine tool processing, in particular to a clamping detection method suitable for thin-walled parts of multiple specifications and a device for implementing the clamping detection method suitable for thin-walled parts of multiple specifications. Background Art

[0002] In the process of machining thin-walled parts with machine tools, internal support clamping or external clamping is often used. For example, patent CN112719957B discloses a thin-walled cylindrical fixture that uses internal support clamping, and patent CN117066935B discloses an open thin-walled boring fixture that uses external clamping.

[0003] Regardless of internal support clamping or external clamping, the clamping device generally uses delay or stroke detection to determine whether the clamp is clamped in place. Delay refers to the movement time of the hydraulic cylinder driving the clamp, and stroke detection refers to the movement stroke of the piston rod in the hydraulic cylinder. Based on the delay time or stroke detection, it can be determined whether the clamp is clamped in place, that is, whether the workpiece is clamped.

[0004] However, when the workpiece is a thin-walled product, in order to prevent the workpiece from deforming during clamping, a lower hydraulic pressure must be used to control the clamping of the fixture. At this time, the clamping speed is slow, the delay time is long, and the machine tool is prone to alarm. In addition, when the specifications of thin-walled products are different, the delay time is also different, and small-batch trial production is required, resulting in a high scrap rate. When product specifications are different, the piston rod travel is also different, and small-batch trial production is also required to determine the travel detection switch detection position, resulting in a high scrap rate. Summary of the invention

[0005] In order to overcome the deficiencies of the prior art, one of the objectives of the present invention is to provide a thin-walled parts clamping detection method that can be applied to thin-walled products of different specifications and does not require trial production.

[0006] In order to overcome the deficiencies of the prior art, a second object of the present invention is to provide a thin-walled parts clamping and detection device that can be applied to thin-walled products of different specifications and does not require trial production.

[0007] One of the purposes of the present invention is achieved by the following technical solution: A clamping detection method for thin-walled parts of multiple specifications, comprising the following steps: Build a clamping device: the rod chamber of the oil cylinder is connected to the main oil circuit through the first oil circuit, and the rodless chamber of the oil cylinder is connected to the main oil circuit through the second oil circuit. A clamping claw is installed on the piston rod of the oil cylinder. A first flow switch and a first pressure switch are arranged on the first oil circuit, and a second flow switch and a second pressure switch are arranged on the second oil circuit. Both the first flow switch and the second flow switch are one-way switches. When the pressure in the first oil circuit reaches a preset value, the first pressure switch generates a signal, and when the hydraulic oil in the first oil circuit flows to the rod chamber, the first flow switch generates a signal; when the pressure in the second oil circuit reaches a preset value, the second pressure switch generates a signal, and when the hydraulic oil in the second oil circuit flows to the rodless chamber, the second flow switch generates a signal; Device zeroing: The oil cylinder performs one internal support clamping and one external clamping respectively. When the internal support clamping is in place, the second flow switch is zeroed; when the external clamping is in place, the first flow switch is zeroed; Gripping jaws: Set the trigger pressure of the first pressure switch and the second pressure switch. ,in is the material coefficient, is the contact area between the clamping jaws and the thin-walled part, is the thickness of the thin-walled part, the maximum width of the cross section of the thin-walled part, the clamping device working, and collecting the signals of the first pressure switch, the first flow switch, the second pressure switch, and the second flow switch during the working process of the clamping device; Determine the clamping state: when the first pressure switch, the first flow switch, the second pressure switch and the second flow switch have no signals, the clamping device is in an unclamped state; when the first flow switch has a signal, and the first pressure switch, the second pressure switch and the second flow switch have no signals, the clamping device is in an internal support clamping process; when the second flow switch has a signal, and the first pressure switch, the second pressure switch and the first flow switch have no signals, the clamping device is in an external clamping process; when the first pressure switch has a signal, and the first flow switch, the second pressure switch and the second flow switch have no signals, the clamping device is in an external clamping position state; when the second pressure switch has a signal, and the first pressure switch, the first flow switch and the second flow switch have no signals, the clamping device is in an internal support clamping position state.

[0008] Furthermore, when the cross section of the thin-walled part is circular, is the diameter of the cross section of a thin-walled part.

[0009] Furthermore, the clamping step of the clamping jaws also includes reducing pressure through a pressure reducing valve, the pressure after the pressure reducing valve reduces pressure is the same as the triggering pressure of the first pressure switch and the second pressure switch, and the pressure reducing valve controls the maximum pressure in the first oil circuit and the second oil circuit.

[0010] Furthermore, in the step of determining the clamping state, when the clamping device is in the external clamping state, the second oil circuit is drained, so the second pressure switch has no signal.

[0011] Furthermore, the triggering directions of the first flow switch and the second flow switch are the same.

[0012] Furthermore, the clamping step of the clamping jaws also includes switching the flow direction of the hydraulic oil through a reversing valve to release the clamping jaws.

[0013] The second object of the present invention is achieved by adopting the following technical solution: A clamping detection device for thin-walled parts of various specifications, used for implementing any one of the above-mentioned clamping detection methods for thin-walled parts of various specifications, comprising a main oil circuit, a first oil circuit, a second oil circuit, an oil cylinder, a first flow switch, a second flow switch, a first pressure switch, a second pressure switch and a processor, wherein the rod chamber of the oil cylinder is connected to the main oil circuit through the first oil circuit, and the rodless chamber of the oil cylinder is connected to the main oil circuit through the second oil circuit, a clamping claw is installed on the piston rod of the oil cylinder, the first flow switch and the first pressure switch are arranged on the first oil circuit, and the second flow switch and the second pressure switch are arranged on the second oil circuit. Switch, the first flow switch and the second flow switch are both one-way switches, when the pressure in the first oil circuit reaches a preset value, the first pressure switch generates a signal, when the hydraulic oil in the first oil circuit flows to the rod chamber, the first flow switch generates a signal; when the pressure in the second oil circuit reaches a preset value, the second pressure switch generates a signal, when the hydraulic oil in the second oil circuit flows to the rodless chamber, the second flow switch generates a signal, the processor comprehensively determines the clamping mode and the clamping state according to the signals of the first flow switch, the second flow switch, the first pressure switch and the second pressure switch.

[0014] Furthermore, the clamping detection device suitable for thin-walled parts of multiple specifications also includes a pressure reducing valve, which is installed between the main oil circuit and the first oil circuit and the second oil circuit. The pressure reducing valve controls the maximum pressure in the first oil circuit and the second oil circuit. The pressure after the pressure is reduced by the pressure reducing valve is the same as the trigger pressure of the first pressure switch and the second pressure switch.

[0015] Furthermore, the triggering directions of the first flow switch and the second flow switch are the same.

[0016] Compared with the prior art, the present invention is applicable to a method for detecting clamping thin-walled parts of various specifications by arranging a first flow switch and a first pressure switch on the first oil circuit of the clamping device, and arranging a second flow switch and a second pressure switch on the second oil circuit. The clamping mode and the clamping state are comprehensively judged by the signals of the first flow switch, the first pressure switch, the second flow switch and the second pressure switch. Under the premise of preventing deformation of the thin-walled workpiece during clamping, the present invention is applicable to thin-walled parts of different specifications and does not require trial production. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a flow chart of the clamping detection method for thin-walled parts of various specifications applicable to the present invention; Figure 2 It is a schematic diagram of the oil circuit of the clamping detection method for thin-walled parts of various specifications applicable to the present invention; Figure 3 This is a schematic diagram of the forces acting on thin-walled parts when they are clamped externally; Figure 4 for Figure 3 Schematic diagram of the oil circuit direction of the cylinder when the thin-walled parts are clamped externally; Figure 5 It is a schematic diagram of the force when the thin-walled part of the present invention is internally supported; Figure 6 for Figure 5 Schematic diagram of the cylinder oil circuit direction when the thin-walled parts are clamped internally.

[0018] In the figure: 10, main oil circuit; 20, pressure reducing valve; 30, reversing valve; 40, first oil circuit; 50, second oil circuit; 60, oil cylinder; 61, housing; 62, piston; 63, rod chamber; 64, rodless chamber; 71, first flow switch; 72, second flow switch; 81, first pressure switch; 82, second pressure switch; 200, thin-walled parts. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may be another intermediate component through which it is fixed. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be another intermediate component at the same time. When a component is considered to be "set on" another component, it may be directly set on the other component or there may be another intermediate component at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0022] See also Figure 1 as well as Figure 2 The present invention provides a clamping detection method for thin-walled parts of various specifications, comprising the following steps: Build a clamping device: the rod chamber 63 of the oil cylinder 60 is connected to the main oil circuit 10 through the first oil circuit 40, and the rodless chamber 64 of the oil cylinder 60 is connected to the main oil circuit 10 through the second oil circuit 50. A clamping claw is installed on the piston rod of the oil cylinder 60. A first flow switch 71 and a first pressure switch 81 are arranged on the first oil circuit 40, and a second flow switch 72 and a second pressure switch 82 are arranged on the second oil circuit 50. Both the first flow switch 71 and the second flow switch 72 are one-way switches. When the pressure in the first oil circuit 40 reaches a preset value, the first pressure switch 81 generates a signal, and when the hydraulic oil in the first oil circuit 40 flows to the rod chamber 63, the first flow switch 71 generates a signal; when the pressure in the second oil circuit 50 reaches a preset value, the second pressure switch 82 generates a signal, and when the hydraulic oil in the second oil circuit 50 flows to the rodless chamber 64, the second flow switch 72 generates a signal; The device is zeroed: the oil cylinder 60 performs one internal support clamping and one external clamping respectively. When the internal support clamping is in place, the second flow switch 72 is zeroed; when the external clamping is in place, the first flow switch 71 is zeroed; Clamping: Set the trigger pressure of the first pressure switch 81 and the second pressure switch 82. , where α is the material coefficient, A is the contact area between the clamping jaws and the thin-walled part 200, H is the thickness of the thin-walled part 200, and D is the maximum width of the cross section of the thin-walled part 200. The clamping device is working, and the signals of the first pressure switch 81, the first flow switch 71, the second pressure switch 82, and the second flow switch 72 are collected during the working process of the clamping device; Determine the clamping state: when the first pressure switch 81, the first flow switch 71, the second pressure switch 82 and the second flow switch 72 have no signals, the clamping device is in an unclamped state; when the first flow switch 71 has a signal, and the first pressure switch 81, the second pressure switch 82 and the second flow switch 72 have no signals, the clamping device is in an internal support clamping process; when the second flow switch 72 has a signal, and the first pressure switch 81, the second pressure switch 82 and the first flow switch 71 have no signals, the clamping device is in an external clamping process; when the first pressure switch 81 has a signal, and the first flow switch 71, the second pressure switch 82 and the second flow switch 72 have no signals, the clamping device is in an external clamping position state; when the second pressure switch 82 has a signal, and the first pressure switch 81, the first flow switch 71 and the second flow switch 72 have no signals, the clamping device is in an internal support clamping position state.

[0023] Specifically, in the step of building the clamping device, a pressure reducing valve 20 and a reversing valve 30 are further provided between the main oil circuit 10 and the first oil circuit 40 and the second oil circuit 50. The pressure reducing valve 20 is used to reduce the pressure of the hydraulic oil entering the reversing valve 30 from the main oil circuit 10. The pressure after the pressure reducing valve 20 is reduced is the same as the triggering pressure of the first pressure switch 81 and the second pressure switch 82. The pressure reducing valve 20 controls the maximum pressure in the first oil circuit 40 and the second oil circuit 50. The triggering directions of the first flow switch 71 and the second flow switch 72 are the same. When the hydraulic oil in the first oil circuit 40 flows to the rod chamber 63, the first flow switch 71 is triggered to generate a signal. When the hydraulic oil in the second oil circuit 50 flows to the rodless chamber 64, the second flow switch 72 is triggered to generate a signal.

[0024] Specifically, in the zeroing step of the device, since the jaws are stationary when they are clamped in place, there will be a certain amount of leakage in the corresponding circuit, and the leakage amount is small. Therefore, in order to prevent the leakage from affecting the accuracy of the first flow switch 71 and the second flow switch 72, the first flow switch 71 and the second flow switch 72 need to be zeroed to avoid the influence of leakage on the first flow switch 71 and the second flow switch 72.

[0025] Please continue reading Figure 3 as well as Figure 4 When the external clamp is clamped in place, the hydraulic oil in the first oil circuit 40 reaches the set value, and the second oil circuit 50 is depressurized. Since there is a certain leakage in the rod chamber 63, there is flow in the first flow switch 71 at this time, thereby generating a signal, which will mislead the detection of the clamping state. At this time, the first flow switch 71 is zeroed, and when the thin-walled part 200 is clamped later, the leakage in the rod chamber 63 will not affect the clamping state judgment of the thin-walled part 200.

[0026] Please continue reading Figure 5 as well as Figure 6 When the inner support is clamped in place, the hydraulic oil in the second oil circuit 50 reaches the set value, and the first oil circuit 40 is depressurized. Since the rodless chamber 64 will have a certain leakage, the second flow switch 72 will have flow at this time, thereby generating a signal, which will mislead the detection of the clamping state. At this time, the second flow switch 72 is adjusted to zero. When the thin-walled part 200 is clamped later, the leakage of the rodless chamber 64 will not affect the clamping state judgment of the thin-walled part 200.

[0027] Specifically, during the clamping process of the clamping jaws, the clamping forms are divided into internal support clamping and external clamping. Since the thin-walled part 200 is easily deformed, the clamping force of the thin-walled part 200 needs to be controlled, and the control is performed by the trigger pressure of the first pressure switch 81 and the second pressure switch 82. When the cross section of the thin-walled part 200 is circular, D is the diameter of the cross section of the thin-walled part 200.

[0028] During the clamping process, please continue to refer to Figure 3 as well as Figure 4 When the thin-walled part 200 is clamped by an external clamp and the clamping has not started, the first pressure switch 81, the first flow switch 71, the second pressure switch 82 and the second flow switch 72 have no signals; when in the clamping process, when the hydraulic oil in the first oil circuit 40 flows to the rod chamber 63, the first flow switch 71 is triggered and generates a signal. At this moment, the hydraulic pressure in the first oil circuit 40 does not reach the triggering pressure of the first pressure switch 81, the first pressure switch 81 has no signal, and the second pressure switch 82 and the second flow switch 72 have no signals. When the external clamp is clamped in place, only a small amount of hydraulic oil leaks out of the first oil circuit 40. Since the first flow switch 71 has been zeroed, the leakage flow rate fails to reach the flow rate that triggers the first flow switch 71. The first flow switch 71 has no signal. The hydraulic oil in the first oil circuit 40 reaches the set value, the first pressure switch 81 generates a signal, the second oil circuit 50 is depressurized, and the second pressure switch 82 has no signal. Since the flow direction of the hydraulic oil in the second oil circuit 50 is opposite to the triggering direction of the second flow switch 72, the second flow switch 72 has no signal.

[0029] Please continue reading Figure 5 as well as Figure 6When the thin-walled part 200 is clamped by internal support, before the clamping starts, the first pressure switch 81, the first flow switch 71, the second pressure switch 82 and the second flow switch 72 have no signals; when in the clamping process, when the hydraulic oil in the second oil circuit 50 flows to the rodless chamber 64, the second flow switch 72 is triggered and generates a signal. At this moment, the hydraulic pressure in the second oil circuit 50 does not reach the triggering pressure of the second pressure switch 82, the second pressure switch 82 has no signal, and the first pressure switch 81 and the first flow switch 71 have no signal. When the inner support is clamped in place, only a small amount of hydraulic oil leaks out of the second oil circuit 50. Since the second flow switch 72 has been zeroed, the leakage flow rate fails to reach the flow rate that triggers the second flow switch 72. The second flow switch 72 has no signal. The hydraulic oil in the second oil circuit 50 reaches the set value, the second pressure switch 82 generates a signal, the first oil circuit 40 is depressurized, and the first pressure switch 81 has no signal. Since the flow direction of the hydraulic oil in the first oil circuit 40 is opposite to the triggering direction of the first flow switch 71, the first flow switch 71 has no signal.

[0030] After the clamping is in place, the direction of the hydraulic oil flow is switched through the reversing valve 30 to release the clamping jaws.

[0031] Please continue reading Figure 2 The present application also relates to a clamping detection device applicable to thin-walled parts 200 of various specifications, which is used to implement the above-mentioned clamping detection method applicable to thin-walled parts 200 of various specifications.

[0032] The clamping detection device suitable for thin-walled parts 200 of various specifications includes a main oil circuit 10, a pressure reducing valve 20, a reversing valve 30, a first oil circuit 40, a second oil circuit 50, an oil cylinder 60, a first flow switch 71, a second flow switch 72, a first pressure switch 81, a second pressure switch 82 and a processor.

[0033] The main oil passage 10 is used to supply oil to the first oil passage 40 and the second oil passage 50. The main oil passage 10 is in communication with the first oil passage 40 and the second oil passage 50.

[0034] The pressure reducing valve 20 is installed between the main oil circuit 10 and the first oil circuit 40 and the second oil circuit 50. The pressure reducing valve 20 is used to reduce the pressure of the hydraulic oil entering the reversing valve 30 from the main oil circuit 10. The pressure after the pressure reducing valve 20 reduces the pressure is the same as the trigger pressure of the first pressure switch 81 and the second pressure switch 82. The pressure reducing valve 20 controls the maximum pressure in the first oil circuit 40 and the second oil circuit 50.

[0035] The reversing valve 30 is installed between the first oil circuit 40 and the second oil circuit 50 to switch the direction of the hydraulic oil and switch between clamping and loosening of the clamping jaws. The pressure reducing valve 20 is located between the main oil circuit 10 and the reversing valve 30, and the hydraulic oil after decompression enters the reversing valve 30.

[0036] The first oil passage 40 is communicated with the rod chamber 63 of the oil cylinder 60 .

[0037] The second oil passage 50 is communicated with the rodless chamber 64 of the oil cylinder 60 .

[0038] The oil cylinder 60 includes a housing 61 and a piston 62 installed in the housing 61. The piston 62 divides the housing 61 into a rod chamber 63 and a rodless chamber 64. The end of the piston rod of the piston 62 extends out of the oil cylinder 60 and is fixed to the clamping claw.

[0039] The first flow switch 71 is installed in the first oil circuit 40 . When there is hydraulic oil flowing toward the rod chamber 63 in the first oil circuit 40 , the first flow switch 71 is triggered to generate a signal.

[0040] The second flow switch 72 is installed in the second oil circuit 50 . When there is hydraulic oil in the second oil circuit 50 flowing toward the rodless chamber 64 , the second flow switch 72 is triggered to generate a signal.

[0041] The first pressure switch 81 is installed in the first oil circuit 40. When the hydraulic oil pressure in the first oil circuit 40 reaches the trigger value of the first pressure switch 81, the first pressure switch 81 is triggered to generate a signal. The trigger value of the first pressure switch 81 is set according to the material, size and thickness of the thin-walled part 200.

[0042] The second pressure switch 82 is installed in the second oil circuit 50. When the hydraulic oil pressure in the second oil circuit 50 reaches the trigger value of the second pressure switch 82, the second pressure switch 82 is triggered to generate a signal. The trigger value of the second pressure switch 82 is set according to the material, size and thickness of the thin-walled part 200.

[0043] Compared with the prior art, the present invention is applicable to a method for detecting clamping thin-walled parts of various specifications by arranging a first flow switch 71 and a first pressure switch 81 on the first oil circuit 40 of the clamping device, and arranging a second flow switch 72 and a second pressure switch 82 on the second oil circuit 50. The clamping mode and the clamping state are comprehensively judged by the signals of the first flow switch 71, the first pressure switch 81, the second flow switch 72 and the second pressure switch 82. Under the premise of preventing the thin-walled workpiece 200 from deforming during clamping, the present invention is applicable to thin-walled parts 200 of different specifications and does not require trial production.

[0044] The above embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which are equivalent modifications and improvements made to the above embodiments based on the essential technology of the present invention, and all of them belong to the protection scope of the present invention.

Claims

1. A clamping detection method suitable for thin-walled parts of various specifications, characterized in that: The following steps are involved: Build a clamping device: the rod chamber of the oil cylinder is connected to the main oil circuit through the first oil circuit, and the rodless chamber of the oil cylinder is connected to the main oil circuit through the second oil circuit. A clamping claw is installed on the piston rod of the oil cylinder. A first flow switch and a first pressure switch are arranged on the first oil circuit, and a second flow switch and a second pressure switch are arranged on the second oil circuit. Both the first flow switch and the second flow switch are one-way switches. When the pressure in the first oil circuit reaches a preset value, the first pressure switch generates a signal, and when the hydraulic oil in the first oil circuit flows to the rod chamber, the first flow switch generates a signal; when the pressure in the second oil circuit reaches a preset value, the second pressure switch generates a signal, and when the hydraulic oil in the second oil circuit flows to the rodless chamber, the second flow switch generates a signal; Device zeroing: The oil cylinder performs one internal support clamping and one external clamping respectively. When the internal support clamping is in place, the second flow switch is zeroed; When the external clamp is clamped in place, the first flow switch is adjusted to zero; Gripping jaws: Set the trigger pressure of the first pressure switch and the second pressure switch. ,in is the material coefficient, is the contact area between the clamping jaws and the thin-walled part, is the thickness of the thin-walled part, the maximum width of the cross section of the thin-walled part, the clamping device working, and collecting the signals of the first pressure switch, the first flow switch, the second pressure switch, and the second flow switch during the working process of the clamping device; Determine the clamping state: when the first pressure switch, the first flow switch, the second pressure switch and the second flow switch have no signals, the clamping device is in an unclamped state; when the first flow switch has a signal, and the first pressure switch, the second pressure switch and the second flow switch have no signals, the clamping device is in an internal support clamping process; when the second flow switch has a signal, and the first pressure switch, the second pressure switch and the first flow switch have no signals, the clamping device is in an external clamping process; when the first pressure switch has a signal, and the first flow switch, the second pressure switch and the second flow switch have no signals, the clamping device is in an external clamping position state; when the second pressure switch has a signal, and the first pressure switch, the first flow switch and the second flow switch have no signals, the clamping device is in an internal support clamping position state.

2. The clamping detection method for thin-walled parts of various specifications according to claim 1 is characterized in that: When the cross section of the thin-walled part is circular, is the diameter of the cross section of a thin-walled part.

3. The clamping detection method for thin-walled parts of various specifications according to claim 1 is characterized in that: The clamping step of the clamping jaws also includes reducing pressure through a pressure reducing valve, the pressure after the pressure reducing valve is reduced is the same as the triggering pressure of the first pressure switch and the second pressure switch, and the pressure reducing valve controls the maximum pressure in the first oil circuit and the second oil circuit.

4. The clamping detection method for thin-walled parts of various specifications according to claim 1 is characterized in that: In the step of determining the clamping state, when the clamping device is in the external clamping state, the second oil circuit is drained, so the second pressure switch has no signal.

5. The clamping detection method applicable to thin-walled parts of various specifications according to claim 1 is characterized in that: The triggering directions of the first flow switch and the second flow switch are the same.

6. The clamping detection method applicable to thin-walled parts of various specifications according to claim 1 is characterized in that: The clamping step of the clamping jaws also includes switching the flow direction of the hydraulic oil through a reversing valve to release the clamping jaws.

7. A clamping detection device for thin-walled parts of various specifications, used to implement the clamping detection method for thin-walled parts of various specifications as claimed in any one of claims 1 to 6, characterized in that: It includes a main oil circuit, a first oil circuit, a second oil circuit, an oil cylinder, a first flow switch, a second flow switch, a first pressure switch, a second pressure switch and a processor. The rod chamber of the oil cylinder is connected to the main oil circuit through the first oil circuit, and the rodless chamber of the oil cylinder is connected to the main oil circuit through the second oil circuit. A clamping claw is installed on the piston rod of the oil cylinder. The first oil circuit is provided with the first flow switch and the first pressure switch, and the second oil circuit is provided with the second flow switch and the second pressure switch. The first flow switch and the second flow switch are both one-way switches. When the pressure in the first oil circuit reaches a preset value, the first pressure switch generates a signal, and when the hydraulic oil in the first oil circuit flows to the rod chamber, the first flow switch generates a signal; when the pressure in the second oil circuit reaches a preset value, the second pressure switch generates a signal, and when the hydraulic oil in the second oil circuit flows to the rodless chamber, the second flow switch generates a signal. The processor comprehensively determines the clamping mode and the clamping state according to the signals of the first flow switch, the second flow switch, the first pressure switch and the second pressure switch.

8. The clamping detection device for thin-walled parts of various specifications according to claim 7 is characterized in that: The clamping detection device for thin-walled parts of multiple specifications also includes a pressure reducing valve, which is installed between the main oil circuit and the first oil circuit and the second oil circuit. The pressure reducing valve controls the maximum pressure in the first oil circuit and the second oil circuit. The pressure after the pressure reduction by the pressure reducing valve is the same as the trigger pressure of the first pressure switch and the second pressure switch.

9. The clamping detection device for thin-walled parts of various specifications according to claim 7 is characterized in that: The triggering directions of the first flow switch and the second flow switch are the same.

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