A novel linkage type oil cylinder stroke detection device and detection method

Abstract

The present invention belongs to the technical field of oil cylinder detection, and specifically discloses a novel linkage type oil cylinder stroke detection device and detection method, which includes a frame, a mounting frame, a first control oil circuit, a second control oil circuit, a piston cavity measuring cylinder, a rod cavity measuring cylinder, a first angle bar, a second angle bar and a detection structure. The piston cavity of the rod cavity measuring cylinder is connected to the rod cavity of the die cylinder, and the rod cavity and the piston cavity of the piston cavity measuring cylinder are connected to the piston cavity of the die cylinder; both the first angle bar and the second angle bar include a first angle rod and a second angle rod that are vertically fixed; a rotating shaft is fixed at the position where the first angle rod and the second angle rod are fixed, and the rotating shaft is rotatably connected to the frame; the first angle rod is slidably connected to the frame; an elastic member is arranged in the rod cavity of the rod cavity measuring cylinder; the rod cavity measuring cylinder and the piston cavity measuring cylinder are respectively used to drive the second angle rod of the first angle bar and the second angle bar to rotate. The externally arranged rod cavity measuring cylinder and piston cavity measuring cylinder are connected in series with the die cylinder, and in the case of no leakage, the true position of the die cylinder can be accurately detected.

Description

Technical Field

[0001] The present invention belongs to the technical field of oil cylinder detection, and particularly relates to a novel linkage type oil cylinder stroke detection device and a detection method. Background Art

[0002] In the die for sheet hot forming, many built-in oil cylinders are integrated, which can realize functions such as blanking, forming, and ejecting of workpieces. These built-in oil cylinders have the following characteristics: ① The cylinder diameter and stroke are generally relatively small, and some strokes are only a dozen millimeters; ② The die space is narrow, and it is impossible to install a detection device or detection switch for the position of the oil cylinder; ③ Strict requirements are imposed on the setting state of the oil cylinder. For example, a slight ejection of the oil cylinder will cause forming defects or even scrapping of the workpiece; ④ The oil cylinder rod is prone to the "floating" phenomenon. Since the mass of the moving part of the oil cylinder is small, and the residual pressure in the pipeline is difficult to completely eliminate, the piston rod of the oil cylinder is not easy to reset and often extends "inexplicably".

[0003] The operation of the built-in oil cylinder is controlled by an oil circuit. The existing oil circuit design of the die cylinder has the following disadvantages: 1. It is impossible to accurately detect the position state of the oil cylinder. Since it is impossible to install a position detection switch, only pressure detection can be used to indirectly judge whether the oil cylinder is in place, which is prone to misjudgment; 2. It is impossible to reliably lock the oil cylinder, and the "floating" phenomenon is likely to occur, resulting in the breakage of the cylinder rod or the scrapping of the workpiece. Summary of the Invention

[0004] The purpose of the present invention is to provide a novel linkage type oil cylinder stroke detection device and a detection method to solve the problems existing in the existing die cylinder oil circuit, namely, the inability to accurately detect the position state of the die cylinder and the easy occurrence of the floating phenomenon, resulting in the breakage of the cylinder rod or the scrapping of the workpiece.

[0005] To achieve the above object, the technical solution of the present invention is: a new type of linkage cylinder stroke detection device, including a frame, a mounting frame, a first control oil circuit, a second control oil circuit, a piston cavity measuring cylinder, a rod cavity measuring cylinder, a first angle bar, a second angle bar and a detection structure; the mounting frame is used to mount the detection structure, and the detection structure includes a first detection member, a second detection member, a third detection member and a fourth detection member; the mounting frame, the piston cavity measuring cylinder, the rod cavity measuring cylinder, the first angle bar and the second angle bar are mounted on the frame; the piston cavity of the rod cavity measuring cylinder is connected to the rod cavity of the mold cylinder through the first control oil circuit, and the rod cavity and the piston cavity of the piston cavity measuring cylinder are connected to the piston cavity of the mold cylinder through the second control oil circuit; both the first angle bar and the second angle bar include a first angle rod and a second angle rod, the length of the first angle rod is longer than that of the second angle rod, and one end of the first angle rod is vertically fixed to the end of the second angle rod; a rotating shaft is fixed at the position where the first angle rod and the second angle rod are fixed, and the rotating shaft is rotatably connected to the frame; the first angle rod is horizontally slidably connected to the frame; an elastic member is arranged in the rod cavity of the rod cavity measuring cylinder, and both sides of the elastic member are respectively connected to the bottom of the rod cavity of the rod cavity measuring cylinder and the top of the piston rod; the ends of the piston rods of the rod cavity measuring cylinder and the piston cavity measuring cylinder are respectively used to drive the second angle rods of the first angle bar and the second angle bar to rotate; the position of the first angle rod in the vertical state is the limit position, and the first detection member corresponds to the limit position; when all the oil in the rod cavity of the mold cylinder is discharged into the piston cylinder of the rod cavity measuring cylinder, the position of the first angle rod of the first angle bar is the terminal position of the first angle bar, and the second detection member corresponds to the terminal position of the first angle bar; when all the oil in the piston cavity of the mold cylinder is discharged into the piston cylinder of the piston cavity measuring cylinder, the position of the first angle rod of the second angle bar is the terminal position of the second angle bar, and the third detection member corresponds to the terminal position of the second angle bar; a certain amount of oil is respectively injected into the piston cavities of the rod cavity measuring cylinder and the piston cavity measuring cylinder through the first control oil circuit and the second control oil circuit by an external oil source, and at this time the position of the first angle rod is the initial position, and the fourth detection member corresponds to the initial position.

[0006] Further, a first strip hole is provided on the first angle rod, and a second strip hole is provided on the second angle rod. The length directions of the first strip hole and the second strip hole are the same as the length directions of the first angle rod and the second angle rod; a first slider is provided at the bottom of the piston rods of the piston cavity measuring cylinder and the rod cavity measuring cylinder; the first slider is slidably connected in the second strip hole; a horizontal slide rail is provided on the frame, and a signal sending slider is slidably connected to the slide rail. A second slider is provided on the signal sending slider, and the second slider is slidably connected in the first strip hole; the first detection member, the second detection member, the third detection member and the fourth detection member correspond to each position of the second slider.

[0007] Further, the elastic member adopts a disc spring.

[0008] Furthermore, a through groove is provided on the frame for the piston rods of the plug cavity measuring cylinder and the rod cavity measuring cylinder to extend out.

[0009] Furthermore, the first detection piece, the second detection piece, the third detection piece and the fourth detection piece all adopt travel switches.

[0010] A new type of linkage cylinder stroke detection method, a detection method using the above detection device for detection, includes the following steps:

[0011] Ejection of the mold cylinder: The second control oil circuit injects external oil source into the rod cavity of the plug cavity measuring cylinder. The oil in the plug cavity of the plug cavity measuring cylinder flows into the plug cavity of the mold cylinder. At the same time, the oil in the rod cavity of the mold cylinder is discharged into the plug cavity of the rod cavity measuring cylinder. The piston rod of the rod cavity measuring cylinder drives the signal sending slider to move through the first angle bar. If the second detection piece corresponding to the terminal position of the rod cavity measuring cylinder and the fourth detection piece corresponding to the initial position of the plug cavity measuring cylinder send signals simultaneously, and the first detection piece corresponding to the limit position of the rod cavity measuring cylinder does not send a signal, it means that the mold cylinder is fully extended in place. If after the second detection piece corresponding to the terminal position of the rod cavity measuring cylinder and the fourth detection piece corresponding to the initial position of the plug cavity measuring cylinder send signals simultaneously, the first detection piece corresponding to the limit position of the rod cavity measuring cylinder also sends a signal, it means that there is a leakage in the pipeline of the rod cavity of the mold cylinder.

[0012] Retraction of the mold cylinder: Under the action of the elastic member, the oil in the plug cavity of the rod cavity measuring cylinder enters the rod cavity of the mold cylinder. At the same time, the oil in the plug cavity of the mold cylinder is discharged into the plug cavity of the plug cavity measuring cylinder, and drives the piston rod of the plug cavity measuring cylinder to move downward. The oil in the rod cavity of the plug cavity measuring cylinder flows back to the fuel tank through the second control oil circuit. The piston rod of the plug cavity measuring cylinder drives the signal sending slider to move through the second angle bar. If the fourth detection piece corresponding to the initial position of the rod cavity measuring cylinder and the third detection piece corresponding to the terminal position of the plug cavity measuring cylinder send signals simultaneously, and the first detection piece corresponding to the limit position of the plug cavity measuring cylinder does not send a signal, it means that the mold cylinder is fully retracted in place. If after the fourth detection piece corresponding to the initial position of the rod cavity measuring cylinder and the third detection piece corresponding to the terminal position of the plug cavity measuring cylinder send signals simultaneously, the first detection piece corresponding to the limit position of the plug cavity measuring cylinder also sends a signal, it means that there is a leakage in the pipeline of the plug cavity of the mold cylinder.

[0013] The beneficial effects of this technical solution are as follows:

[0014] ① In this technical solution, the externally arranged rod cavity measuring cylinder and plug cavity measuring cylinder are connected in series with the mold cylinder. In the case of no leakage, the true position of the mold cylinder can be accurately detected.

[0015] ② The rod cavity measuring cylinder of this device is internally provided with an elastic member (disc spring), which can pre-press the rod cavity of the rod cavity measuring cylinder, effectively lock the oil cylinder, and suppress the "floating" phenomenon of the oil cylinder rod.

[0016] ③This device can detect and judge the internal leakage of the die cylinder and the external leakage of the pipeline.

[0017] ④The vertical stroke of the second slider from the limit position to the terminal position is S1, and the horizontal stroke of the signal - sending slider from the limit position to the terminal position is S2; when the first angle bar is in the limit position, the horizontal distance from the center of the second slider to the rotation center of the rotating shaft is L1, and the vertical distance from the center of the first slider to the rotation center of the rotating shaft is L2. The displacement magnification ratio is S2 / S1 = L2 / L1, and L2 > L1; it has a built - in stroke magnification mechanism and can also be competent for the detection of the micro - stroke of the die cylinder.

[0018] ⑤All parts of this device are conventional parts, with mature technology, reliable and durable, easy to process and produce, and have a high cost performance. Brief Description of the Drawings

[0019] Figure 1 It is a schematic structural diagram of a novel linkage - type oil cylinder stroke detection device of the present invention. Detailed Description of the Invention

[0020] The following will be further described in detail through specific embodiments:

[0021] The reference numerals in the accompanying drawings of the specification include: die cylinder 1, rod - cavity measuring cylinder 2, plug - cavity measuring cylinder 3, elastic member 4, frame 5, mounting bracket 6, slide rail 7, signal - sending slider 8, rotating shaft 9, first angle bar 10, second angle bar 11, first angle rod 12, second angle rod 13, first slider 14, second slider 15, second strip - shaped hole 16, first strip - shaped hole 17, first detecting member 18, second detecting member 19, third detecting member 20, fourth detecting member 21, first control oil circuit 22, second control oil circuit 23.

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0023] Embodiment 1

[0024] Basically as shown in the attached Figure 1As shown: A new type of linkage cylinder stroke detection device includes a frame 5, a mounting frame 6, a first control oil circuit 22, a second control oil circuit 23, a piston cavity measuring cylinder 3, a rod cavity measuring cylinder 2, a first angle bar 10, a second angle bar 11 and a detection structure; The mounting frame 6 is used to mount the detection structure, and the detection structure includes a first detection member 18, a second detection member 19, a third detection member 20 and a fourth detection member 21, and the first detection member 18, the second detection member 19, the third detection member 20 and the fourth detection member 21 all adopt travel switches. The mounting frame 6, the piston cavity measuring cylinder 3, the rod cavity measuring cylinder 2, the first angle bar 10 and the second angle bar 11 are mounted on the frame 5; The piston cavity of the rod cavity measuring cylinder 2 is connected to the rod cavity of the mold cylinder 1 through the first control oil circuit 22, and the rod cavity and the piston cavity of the piston cavity measuring cylinder 3 are connected to the piston cavity of the mold cylinder 1 through the second control oil circuit 23.

[0025] Both the first angle bar 10 and the second angle bar 11 include a first angle rod 12 and a second angle rod 13. The length of the first angle rod 12 is longer than that of the second angle rod 13, and one end of the first angle rod 12 is vertically fixed to the end of the second angle rod 13; A rotating shaft 9 is fixed at the position where the first angle rod 12 and the second angle rod 13 are fixed, and the rotating shaft 9 is rotatably connected to the frame 5. An elastic member 4 is arranged in the rod cavity of the rod cavity measuring cylinder 2. The elastic member 4 adopts a disc spring, and both sides of the elastic member 4 are respectively connected to the bottom of the rod cavity of the rod cavity measuring cylinder 2 and the top of the piston rod; A through groove for the piston rods of the piston cavity measuring cylinder and the rod cavity measuring cylinder 2 to extend out is arranged on the frame 5.

[0026] The ends of the piston rod of the rod cavity measuring cylinder 2 and the end of the piston rod of the piston cavity measuring cylinder 3 are respectively used to drive the second angle rod 13 of the first angle bar 10 and the second angle bar 11 to rotate. Specifically, a first strip hole 17 is arranged on the first angle rod 12, and a second strip hole 16 is arranged on the second angle rod 13. The length directions of the first strip hole 17 and the second strip hole 16 are the same as the length directions of the first angle rod 12 and the second angle rod 13; A first slider 15 is arranged at the bottom of the piston rods of the piston cavity measuring cylinder 3 and the rod cavity measuring cylinder 2; The first slider 15 is slidably connected in the second strip hole 16. The first angle rod 12 is horizontally slidably connected to the frame 5. Specifically, a horizontal slide rail 7 is arranged on the frame 5, a signal sending slider 8 is slidably connected on the slide rail 7, a second slider 14 is arranged on the signal sending slider 8, and the second slider 14 is slidably connected in the first strip hole 17. The first detection member 18, the second detection member 19, the third detection member 20 and the fourth detection member 21 correspond to each position of the second slider 14.

[0027] When the first corner rod 12 is in the vertical state, its position is the limit position, and the first detection piece 18 corresponds to the limit position; when all the oil in the rod cavity of the die cylinder 1 is discharged into the plug cylinder of the rod cavity measuring cylinder 2 through port A, the position of the first corner rod 12 of the first corner bar 10 is the terminal position of the first corner bar 10, and the second detection piece 19 corresponds to the terminal position of the first corner bar 10. When all the oil in the plug cavity of the die cylinder 1 is discharged into the plug cylinder of the plug cavity measuring cylinder 3 through port B, the position of the first corner rod 12 of the second corner bar 11 is the terminal position of the second corner bar 11, and the third detection piece 20 corresponds to the terminal position of the second corner bar 11. A certain amount of oil is injected into the plug cylinders of the rod cavity measuring cylinder 2 and the plug cavity measuring cylinder respectively through the first control oil circuit 22 and the second control oil circuit 23 by an external oil source. At this time, the position of the first corner rod 12 is the initial position, and the fourth detection piece 21 corresponds to the initial position.

[0028] Initial position setting: First, switch the first control oil circuit 22 and the second control oil circuit 23, and use an external oil source to press the rod cavity measuring cylinder 2 and the plug cavity measuring cylinder 3 away from the upper limit position. After reaching a certain position, close the first control oil circuit 22 and the second control oil circuit 23. The rod cavity measuring cylinder 2 and the plug cavity measuring cylinder 3 are in a holding state. This position is the initial position and is matched with the fourth detection piece 21. The initial position depends on the volume of the die cylinder.

[0029] Setting the terminal position of the rod cavity measuring cylinder 2: Switch the first control oil circuit 22 to connect the rod cavity measuring cylinder 2 with the rod cavity of the die cylinder 1, and at the same time, the second control oil circuit 23 is connected to the plug cavity of the die cylinder 1. At this time, all the oil in the rod cavity of the die cylinder 1 will be completely discharged into the rod cavity measuring cylinder 2, and the piston rod of the rod cavity measuring cylinder 2 will extend with a stroke of S1. At the same time, it drives the first corner bar 10 to rotate, and the first corner bar 10 drives the signal - sending slider 8 to move horizontally by a distance of S2. After stopping, a second detection piece 19 is matched at this position. The displacement magnification ratio S2 / S1 = L2 / L1, where L2 > L1, and the displacement of the die cylinder is magnified.

[0030] Setting the terminal position of the plug cavity measuring cylinder 3: Switch the second control oil circuit 23 to connect the plug cavity measuring cylinder 3 with the plug cavity of the die cylinder 1, and at the same time, the first control oil circuit 22 is connected to the rod cavity of the die cylinder 1. At this time, all the oil in the plug cavity of the die cylinder 1 will be completely discharged into the plug cavity measuring cylinder 3, and the piston rod of the plug cavity measuring cylinder 3 will extend. At the same time, it drives the second corner bar 11 to rotate, and the second corner bar 11 drives the signal - sending slider 8 to move horizontally. After stopping, a third detection piece 20 is matched at this position.

[0031] Embodiment 2

[0032] A new type of linkage - type oil cylinder stroke detection method, which is a detection method using the detection device in Embodiment 1, includes the following steps:

[0033] Ejection of Die Cylinder 1: The second control oil circuit 23 injects oil from an external oil source into the rod cavity of the plug cavity measuring cylinder 3 through port C. The oil in the plug cavity of the plug cavity measuring cylinder 3 flows into the plug cavity of the die cylinder 1 through port B. At the same time, the oil in the rod cavity of the die cylinder 1 is discharged into the plug cavity of the rod cavity measuring cylinder 2 through port A. The piston rod of the rod cavity measuring cylinder 2 drives the signal sending slider 8 to move through the first angle bar 10. If the second detection piece 19 corresponding to the terminal position of the rod cavity measuring cylinder 2 and the fourth detection piece 21 corresponding to the initial position of the plug cavity measuring cylinder 3 send signals simultaneously, and the first detection piece 18 corresponding to the limit position of the rod cavity measuring cylinder 2 does not send a signal, it means that the die cylinder 1 is fully extended in place. If after the second detection piece 19 corresponding to the terminal position of the rod cavity measuring cylinder 2 and the fourth detection piece 21 corresponding to the initial position of the plug cavity measuring cylinder 3 send signals simultaneously, the first detection piece 18 corresponding to the limit position of the rod cavity measuring cylinder 2 also sends a signal, it means that there is a leakage in the pipeline of the rod cavity of the die cylinder 1.

[0034] Retraction of Die Cylinder 1: Under the action of the elastic member 4, the oil in the plug cavity of the rod cavity measuring cylinder 2 enters the rod cavity of the die cylinder 1 through port A. At the same time, the oil in the plug cavity of the die cylinder 1 is discharged into the plug cavity of the plug cavity measuring cylinder 3 through port B, and drives the piston rod of the plug cavity measuring cylinder 33 to move downward. The oil in the rod cavity of the plug cavity measuring cylinder 3 flows back to the fuel tank through port C and the second control oil circuit 23. The piston rod of the plug cavity measuring cylinder 3 drives the signal sending slider 8 to move through the second angle bar 11. If the fourth detection piece 21 corresponding to the initial position of the rod cavity measuring cylinder 2 and the third detection piece 20 corresponding to the terminal position of the plug cavity measuring cylinder 3 send signals simultaneously, and the first detection piece 18 corresponding to the limit position of the plug cavity measuring cylinder 3 does not send a signal, it means that the die cylinder 1 is fully retracted in place. If after the fourth detection piece 21 corresponding to the initial position of the rod cavity measuring cylinder 2 and the third detection piece 20 corresponding to the terminal position of the plug cavity measuring cylinder 3 send signals simultaneously, the first detection piece 18 corresponding to the limit position of the plug cavity measuring cylinder 3 also sends a signal, it means that there is a leakage in the pipeline of the plug cavity of the die cylinder 1.

[0035] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variation thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device.

[0036] The above are only embodiments of the present invention. Specific structures and characteristics and other common knowledge in the art are not described in detail herein. Those of ordinary skill in the art know all the common general technical knowledge in the technical field to which the invention pertains before the filing date or the priority date, can know all the prior art in this field, and have the ability to apply the conventional experimental means before this date. Those of ordinary skill in the art can, under the inspiration given in this application, complete and implement this solution in combination with their own abilities. Some typical well-known structures or well-known methods should not become an obstacle for those of ordinary skill in the art to implement this application. It should be noted that for those skilled in the art, without departing from the structure of the present invention, several deformations and improvements can also be made, and these should also be regarded as the protection scope of the present invention, and these will not affect the implementation effect of the present invention and the practicality of the patent. The protection scope claimed in this application shall be subject to the content of its claims, and the specific implementation manners and the like recorded in the specification can be used to interpret the content of the claims.

Claims

1. A novel linkage type oil cylinder stroke detection device, characterized in that: It includes a frame (5), a mounting frame (6), a first control oil circuit (22), a second control oil circuit (23), a piston cavity measuring cylinder (3), a rod cavity measuring cylinder (2), a first angle bar (10), a second angle bar (11) and a detection structure; the mounting frame (6) is used to mount the detection structure, and the detection structure includes a first detection piece (18), a second detection piece (19), a third detection piece (20) and a fourth detection piece (21); the mounting frame (6), the piston cavity measuring cylinder (3), the rod cavity measuring cylinder (2), the first angle bar (10) and the second angle bar (11) are mounted on the frame (5); the piston cavity of the rod cavity measuring cylinder (2) is connected to the rod cavity of the die cylinder (1) through the first control oil circuit (22), and the rod cavity and the piston cavity of the piston cavity measuring cylinder (3) are connected to the piston cavity of the die cylinder (1) through the second control oil circuit (23); both the first angle bar (10) and the second angle bar (11) include a first angle rod (12) and a second angle rod (13), the length of the first angle rod (12) is longer than that of the second angle rod (13), and one end of the first angle rod (12) is perpendicularly fixed to the end of the second angle rod (13); a rotating shaft (9) is fixed at the position where the first angle rod (12) and the second angle rod (13) are fixed, and the rotating shaft (9) is rotatably connected to the frame (5); the first angle rod (12) is horizontally slidably connected to the frame (5); an elastic member (4) is arranged in the rod cavity of the rod cavity measuring cylinder (2), and both sides of the elastic member (4) are respectively connected to the bottom of the rod cavity of the rod cavity measuring cylinder (2) and the top of the piston rod; the ends of the piston rod of the rod cavity measuring cylinder (2) and the piston rod of the piston cavity measuring cylinder (3) are respectively used to drive the second angle rod (13) of the first angle bar (10) and the second angle bar (11) to rotate; the position of the first angle rod (12) in the vertical state is the limit position, and the first detection piece (18) corresponds to the limit position; the position of the first angle rod (12) of the first angle bar (10) when all the oil in the rod cavity of the die cylinder (1) is drained into the piston cylinder of the rod cavity measuring cylinder (2) is the terminal position of the first angle bar (10), and the second detection piece (19) corresponds to the terminal position of the first angle bar (10); the position of the first angle rod (12) of the second angle bar (11) when all the oil in the piston cavity of the die cylinder (1) is drained into the piston cylinder of the piston cavity measuring cylinder (3) is the terminal position of the second angle bar (11), and the third detection piece (20) corresponds to the terminal position of the second angle bar (11); a certain amount of oil is respectively injected into the piston cavities of the rod cavity measuring cylinder (2) and the piston cavity measuring cylinder (3) through the first control oil circuit (22) and the second control oil circuit (23) by an external oil source, and at this time the position of the first angle rod (12) is the initial position, and the fourth detection piece (21) corresponds to the initial position;A first strip-shaped hole (17) is provided on the first corner rod (12), a second strip-shaped hole (16) is provided on the second corner rod (13), and the length directions of the first strip-shaped hole (17) and the second strip-shaped hole (16) are the same as the length directions of the first corner rod (12) and the second corner rod (13); a first slider (15) is provided at the bottom of the piston rod of the plug cavity measuring cylinder (3) and the rod cavity measuring cylinder (2); the first slider (15) is slidably connected in the second strip-shaped hole (16); a horizontal slide rail (7) is provided on the frame (5), a signal sending slider (8) is slidably connected to the slide rail (7), a second slider (14) is provided on the signal sending slider (8), and the second slider (14) is slidably connected in the first strip-shaped hole (17); the first detecting member (18), the second detecting member (19), the third detecting member (20), and the fourth detecting member (21) correspond to respective positions of the second slider (14).; 2. A novel linkage type oil cylinder stroke detection device according to claim 1, characterized in that: The elastic member (4) is a disc spring.

3. A novel linkage type cylinder stroke detection device according to claim 1, characterized in that: The frame (5) is provided with a through groove for the piston rods of the plug cavity measuring cylinder (3) and the rod cavity measuring cylinder (2) to extend out.

4. A novel linkage type oil cylinder stroke detection device according to claim 1, characterized in that: The first detection member (18), the second detection member (19), the third detection member (20) and the fourth detection member (21) are all travel switches.

5. A detection method for detecting by using the novel linkage type oil cylinder stroke detection device according to any one of claims 1-4, characterized in that: It includes the following steps: Ejection of the die cylinder (1): The second control oil circuit (23) injects external oil source into the rod cavity of the plug cavity measuring cylinder (3). The oil in the plug cavity of the plug cavity measuring cylinder (3) flows into the plug cavity of the die cylinder (1), and at the same time, the oil in the rod cavity of the die cylinder (1) is discharged into the plug cavity of the rod cavity measuring cylinder (2). The piston rod of the rod cavity measuring cylinder (2) drives the signal sending slider (8) to move through the first angle bar (10). If the second detection member (19) corresponding to the terminal position of the rod cavity measuring cylinder (2) and the fourth detection member (21) corresponding to the initial position of the plug cavity measuring cylinder (3) send signals simultaneously, and the first detection member (18) corresponding to the limit position of the rod cavity measuring cylinder (2) does not send a signal, it means that the die cylinder (1) has fully extended in place. If after the second detection member (19) corresponding to the terminal position of the rod cavity measuring cylinder (2) and the fourth detection member (21) corresponding to the initial position of the plug cavity measuring cylinder (3) send signals simultaneously, the first detection member (18) corresponding to the limit position of the rod cavity measuring cylinder (2) also sends a signal, it means that there is a leak in the pipeline of the rod cavity of the die cylinder (1). Retraction of the die cylinder (1): Under the action of the elastic member (4), the oil in the plug cavity of the rod cavity measuring cylinder (2) enters the rod cavity of the die cylinder (1), and at the same time, the oil in the plug cavity of the die cylinder (1) is discharged into the plug cavity of the plug cavity measuring cylinder (3), and drives the piston rod of the plug cavity measuring cylinder (3) to move downward. The oil in the rod cavity of the plug cavity measuring cylinder (3) flows back to the fuel tank through the second control oil circuit (23). The piston rod of the plug cavity measuring cylinder (3) drives the signal sending slider (8) to move through the second angle bar (11). If the fourth detection member (21) corresponding to the initial position of the rod cavity measuring cylinder (2) and the third detection member (20) corresponding to the terminal position of the plug cavity measuring cylinder (3) send signals simultaneously, and the first detection member (18) corresponding to the limit position of the plug cavity measuring cylinder (3) does not send a signal, it means that the die cylinder (1) has fully retracted in place. If after the fourth detection member (21) corresponding to the initial position of the rod cavity measuring cylinder (2) and the third detection member (20) corresponding to the terminal position of the plug cavity measuring cylinder (3) send signals simultaneously, the first detection member (18) corresponding to the limit position of the plug cavity measuring cylinder (3) also sends a signal, it means that there is a leak in the pipeline of the plug cavity of the die cylinder (1).

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