Double-cylinder angle positioning device

Abstract

The double-cylinder angle positioning device comprises an angle locking mechanism and a ball positioning mechanism, wherein the angle locking mechanism is composed of a piston, a positioning pin and a pin hole, and the ball positioning mechanism is composed of a round ball sliding groove, a positioning hole, a jackscrew, a spring and a ball. According to the device, the positioning holes are matched with the positioning pins for locking, the two-way air cylinder structure is internally arranged, and when the air cylinder is pushed out, the positioning pins can enter the pin holes at the same time, so that the purpose of angle locking is achieved; when the tool needs to rotate to replace the station, the air cylinder retreats and drives the positioning pin to retreat from the pin hole at the same time, and the purpose of unlocking is achieved. The double-air-cylinder angle positioning device is simple in structure, convenient to operate and low in manufacturing cost, milling of workpiece blanks at different angles and positions can be achieved through reciprocating motion of the air cylinder pistons and multi-angle rotation of the connecting rod, and the product yield and the production efficiency are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of milling, and particularly to a double-cylinder angle positioning device. Background Art

[0002] Traditional milling of workpiece blanks is carried out step by step and at different angles. Usually, after machining one side, the workpiece is rotated to continue machining the other side. To ensure the accuracy of the positional relationship between one position and other positions during the machining process, secondary positioning needs to be carried out through a fixture, but there are usually errors in secondary positioning. When machining each surface one by one, some errors will be accumulated for each surface. Therefore, the efficiency is relatively low, the error is large, and the yield rate is low.

[0003] At the present stage, high-end equipment such as four-axis or five-axis fixtures can be used to complete the milling of multiple surfaces of workpiece blanks, that is, multiple surfaces can be machined simultaneously through one clamping. However, there is also the problem that multi-axis equipment has a relatively high cost in production. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a double-cylinder angle positioning device to achieve accurate angle positioning of a workpiece blank in the milling process with a simple structure and a relatively low cost.

[0005] To solve the above technical problem, the technical solution of the present invention is as follows: The double-cylinder angle positioning device of the present invention includes a support plate. On the left and right sides of the support plate, a support connecting shaft, a side plate, a cylinder, a cylinder head, and a piston disposed in the cavity of the cylinder are symmetrically provided. Among them, the support connecting shaft includes a connecting rod and an end plate. The support plate is fixedly connected to the end plate. The connecting rod sequentially passes through the side plate, the cylinder, and the cylinder head and can rotate around its axis. The piston can reciprocate along its axis direction under the drive of the gas provided by an external air source in the cavity of the cylinder. A plurality of positioning pins are fixed on the piston, and the positioning pins are evenly distributed in the circumferential direction around the axis of the piston; on the end face of the end plate adjacent to the side plate, a plurality of pin holes matching the plurality of positioning pins are provided; when the piston moves towards the end plate to the innermost side, the plurality of positioning pins are inserted into the plurality of pin holes; when the piston moves away from the end plate to the outermost side, the plurality of positioning pins are separated from the plurality of pin holes.

[0006] Optionally, in the above dual-cylinder angle positioning device, a plurality of side plate holes penetrating through the thickness of the side plate are provided on the side plate. The plurality of side plate holes are symmetrically arranged with respect to the axis of the connecting rod. A setscrew, a spring sleeved on the setscrew, and a ball provided at the top end of the spring are provided in each side plate hole. A circular ball chute is provided on the end face of the end plate adjacent to the side plate, and a plurality of positioning holes are evenly distributed on the ball chute. When the support connecting shaft rotates, the ball slides in the circular ball chute. When it rotates to the position of the positioning hole, the ball will slide into the positioning hole under the action of the spring, and when the ball slides into the positioning hole, the positioning pin is aligned with the corresponding pin hole.

[0007] Optionally, in the above dual-cylinder angle positioning device, the plurality of positioning pins are 4 positioning pins; the plurality of pin holes are 4 pin holes.

[0008] Optionally, in the above dual-cylinder angle positioning device, the plurality of side plate holes are 2 side plate holes.

[0009] Optionally, in the above dual-cylinder angle positioning device, a first air hole penetrates into the inner side of the cylinder body along the axial direction of the cylinder head and extends in the radial direction to form an L-shaped gas passage, and is communicated with the cavity of the cylinder; a second air hole penetrates into the outer side of the cylinder body along the axial direction of the cylinder head and extends in the radial direction to form an L-shaped gas passage, and is communicated with the cavity of the cylinder.

[0010] Optionally, the L-shaped gas passage of the first air hole includes a first through hole arranged parallel to the axis of the cylinder and a second through hole arranged perpendicular to the axis of the cylinder. The end of the second through hole intersects with the inner end wall and the inner circumferential side wall of the cylinder. The second through hole of the L-shaped gas passage of the first air hole is located inside the piston; the L-shaped gas passage of the second air hole is located outside the piston. When gas enters the cavity of the cylinder through the first air hole, the piston is pushed to move outward; when gas enters the cavity of the cylinder through the second air hole, the piston is pushed to move inward.

[0011] Optionally, in the above dual-cylinder angle positioning device, the L-shaped gas passage of the second air hole includes a first through hole arranged parallel to the axis of the cylinder and a second groove arranged perpendicular to the axis of the cylinder. The second groove is located on the outer end wall of the cylinder body.

[0012] Optionally, in the above dual-cylinder angle positioning device, a step is provided at the junction of the second through hole of the L-shaped gas passage of the first air hole and the inner end wall and the inner circumferential side wall of the cylinder to define the limit movement position of the piston inward.

[0013] Optionally, in the above double-cylinder angle positioning device, blank fixing mechanisms are provided on both the upper and lower surfaces of the support plate. Each blank fixing mechanism includes: a bottom plate, a left bracket and a right bracket fixed on the bottom plate, a first V-groove plate provided at the top of the left bracket, a second V-groove plate provided at the top of the right bracket, a third V-groove plate provided on the bottom plate and located between the left bracket and the right bracket, a left V-shaped pressing plate and a right V-shaped pressing plate.

[0014] Optionally, in the above double-cylinder angle positioning device, it further includes a horizontally placed base, and side plates are vertically fixed on the base. The axis of the support plate is parallel to the base.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: The double-cylinder angle positioning device of the present invention has a simple structure, convenient operation and low manufacturing cost. It can realize milling processing of work-piece blanks at different angles and positions through the reciprocating motion of the cylinder piston and multiple-angle rotation of the connecting rod, improving the product yield and production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art.

[0017] Figure 1A is an exploded structural schematic diagram of the double-cylinder angle positioning device of the present invention; Figure 1B is an assembled structural schematic diagram of the double-cylinder angle positioning device of the present invention; Figure 2 is a structural schematic diagram of the angle locking mechanism of the double-cylinder angle positioning device of the present invention; Figure 3 is a structural schematic diagram of the ball positioning mechanism of the double-cylinder angle positioning device of the present invention; Figure 4 is a structural schematic diagram of the ball chute, positioning holes and pin holes of the double-cylinder angle positioning device of the present invention; Figure 5 is a schematic diagram of the double-cylinder angle positioning device of the present invention in a locked state; Figure 6 is a schematic diagram of the double-cylinder angle positioning device of the present invention in an open state; Figure 7 is a structural schematic diagram of the air outlet holes for pushing and the air return holes of the cylinder of the double-cylinder angle positioning device of the present invention; Figure 8 is a structural schematic diagram of the cylinder piston of the double-cylinder angle positioning device of the present invention when it is pushed out; Figure 9Schematic structural diagram when the cylinder piston of the double-cylinder angle positioning device of the present invention retracts. Specific embodiments

[0018] Here, the exemplary embodiments will be described in detail, and the examples are shown in the accompanying drawings. When the following description refers to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. On the contrary, they are merely examples of systems consistent with some aspects of the present invention as detailed in the appended claims.

[0019] Read the description of the illustrative embodiments according to the principles of the present invention in conjunction with the accompanying drawings, and the accompanying drawings are considered to be a part of the entire written description. In the description of the embodiments of the present invention disclosed herein, any reference to direction or orientation is for the convenience of description only and does not limit the scope of the present invention in any way. Relative terms, such as "downward", "upward", "horizontal", "vertical", "above", "below", "upper", "lower", "top", "bottom" and their derivatives (e.g., "horizontally", "downwardly", "upwardly", etc.) should be construed as referring to the orientation as described or as shown in the accompanying drawings discussed. These relative terms are for convenience of description only and do not require the device to be constructed or operated in a particular orientation unless explicitly stated.

[0020] Terms such as "attached", "added", "connected", "coupled", "interconnected", etc. refer to the relationship in which structures are directly or indirectly fixed or attached to each other through an intermediate structure, and both are either movably or rigidly attached or related unless otherwise explicitly stated. In addition, the features and benefits of the present invention are illustrated by reference to the exemplary embodiments. Therefore, the present invention is clearly not limited to such exemplary embodiments, which illustrate some possible non-limiting combinations of features that may exist alone or in combination with other features; the scope of the present invention is defined by the appended claims.

[0021] Such as Figure 1A and Figure 1BAs shown in the figure, the double-cylinder angle positioning device of the present invention includes a support plate 5. The structures on the left and right sides of the support plate 5 are symmetric. Taking the structure on the right side of the support plate 5 as an example for description, for the convenience of description, the side of each component facing the support plate 5 is called the inner side, and the opposite side is the outer side. The support plate 5 is fixedly connected to a support connecting shaft, which includes a connecting rod 22 and an end plate 25. The diameter of the end plate 25 is larger than that of the connecting rod 22. The end plate 25 is fixedly connected to the support plate 5, and the plane of the end plate 25 is perpendicular to the plane of the support plate 5. The connecting rod 22 is arranged to penetrate through the side plate 21, the cylinder 14, and the cylinder head 18 in sequence from the inside to the outside. A piston 19 is arranged in the cavity of the cylinder 14. The piston 19 can reciprocate along its axis under the drive of the gas provided by an external air source in the cavity of the cylinder 14. The connecting rod 22 can rotate around its axis. A sleeve 13 may be provided at the socket where the connecting rod 22 is sleeved with the side plate 21. The connecting rod 22 and the sleeve 13 are in sliding fit so that the connecting rod 22 can rotate around its axis. The cylinder head 18 is fixed to the outer end face of the cylinder 14 by M6 long screws 17.

[0022] As Figure 1A and Figure 1B shown in the figure, blank fixing mechanisms are provided on both the upper and lower surfaces of the support plate 5. Each blank fixing mechanism includes: a bottom plate 1, a left bracket 10 and a right bracket 2 fixed on the bottom plate 1, a first V-groove plate provided at the top of the left bracket 10, a second V-groove plate provided at the top of the right bracket 2, a third V-groove plate provided on the bottom plate 1 between the left bracket 10 and the right bracket 2, a left V-shaped pressing plate 8 and a right V-shaped pressing plate 6. The blank fixing mechanism can achieve multi-angle fixing for easy clamping. Specifically, three V-groove plates are used to position the movement in the front, back, left, and right directions. The left and right V-groove plates (the first and second V-groove plates) and the left and right V-shaped pressing plates (the right V-shaped pressing plate 6 and the left V-shaped pressing plate 8) limit the up and down positioning of the blank 9, and the V-groove plate on the bottom surface (the third V-groove plate) defines the left and right positioning of the blank 9. The blank 9 is fixed to the second V-groove plate by the right V-shaped pressing plate 6 through M5 bolts 4, M5 nuts 7, and M6 long screws 17, and the blank 9 is fixed to the first V-groove plate by the left V-shaped pressing plate 8 through M5 bolts 4 and M6 long screws 17. Both the left bracket 10 and the right bracket 2 are fixed to the bottom plate 1 by base screws 3. The bottom plate 1 of the blank fixing mechanism is fixed to the support plate 5 by M4 screws 11. The blank 9 is a casting blank.

[0023] The double-cylinder angle positioning device of the present invention further includes a horizontally placed base 23. The bottom end of the side plate 21 is vertically fixed to the base 23 by M10 screws 24. The axis of the support plate 5 is parallel to the base 23. The base 23 is horizontally placed, the side plate 21 is vertically fixed, and the axis of the support plate 5 is parallel to the base 23. When the support connecting shaft rotates, the support connecting shaft will drive the blank fixed on the support plate 5 to rotate together.

[0024] AsFigure 2 As shown, the piston 19 is arranged inside the cylinder 14. A plurality of positioning pins 15 are fixedly arranged around the axis of the piston 19 at equal intervals. On the end face of the end plate 25 adjacent to the side plate 21, there are a plurality of pin holes 251 that match the plurality of positioning pins. When the piston 19 moves to the innermost side towards the end plate 25, the plurality of positioning pins 15 are inserted into the plurality of pin holes 251. When the piston 16 moves away from the end plate 25 to the outermost side, the plurality of positioning pins 15 are separated from the plurality of pin holes 251. Preferably, 4 positioning pins 15 that are evenly distributed circumferentially around the center of the piston 19 are fixed on the piston 19. Through holes through which the positioning pins 15 can pass are provided on the side plate 21 and the cylinder 14. When it rotates into place, the through holes are aligned with the pin holes 251 (described later) on the end plate 25. As Figure 3 shown, there are 4 pin holes 251 on the outer end face of the end plate 25 that supports and connects the shaft. The pin holes 251 cooperate with the positioning pins 15 for locking. Among them, the piston 19, the positioning pins 15, and the pin holes 251 together constitute an angular locking mechanism. The positioning pins 15 are fixed on the piston 19 by screws 191.

[0025] See Figure 3 and Figure 4 , according to an embodiment of the present invention, a spring ball structure is also provided to assist the accurate positioning of the positioning pins 15 and the pin holes 251 in the angular locking mechanism. A plurality of side plate holes penetrating the thickness of the side plate 21 are provided on the side plate 21. Preferably, as Figure 3 shown, there are two side plate holes penetrating the thickness of the side plate 21 on the side plate 21. The two side plate holes are symmetrically arranged with respect to the axis of the connecting rod 22. In the direction from the outside to the inside of the side plate 21, a setscrew 211, a spring 212 sleeved on the setscrew 211, and a ball 213 arranged at the top of the spring 212 are sequentially provided in each side plate hole. As Figure 4 shown, a circular ball chute 252 is also provided on the outer end face (the end face adjacent to the side plate 21) of the end plate 25. The circular ball chute 252 can prevent the balls from falling off during movement and improve stability. Four positioning holes 253 are evenly distributed on the ball chute 252 to achieve positioning at four angles of 0°, 90°, 180°, and 270°.

[0026] See again Figure 3, the positions of the two side plate holes are symmetrically arranged with respect to the connecting rod 22 passing through the side plate 21 and are set such that when the support connecting shaft rotates, the ball 213 will slide within the circular ball chute 252 of the end plate 25 of the support connecting shaft. When the blank rotates to a specific angle, at this time the ball 213 rotates to the position of the positioning hole 253, and the ball 213 will slide into the positioning hole 253 under the action of the spring 212 to achieve the purpose of rapid positioning. Preferably, the circular ball chute 252 is arranged on the outer edge of the pin hole 251; wherein the circular ball chute 252, the positioning hole 253, the setscrew 211, the spring 212 and the ball 213 together constitute a ball positioning mechanism. Preferably, the ball 212 is a steel ball.

[0027] The double-cylinder angle positioning device of the present invention is used in a milling machine and is locked with four positioning holes 253 in cooperation with the positioning pins 15; when the connecting shaft rotates, the connecting shaft drives the support plate 5 and the blank fixed on the support plate 5 to rotate together. At the same time, the ball 231 will slide within the ball chute 252 in the end plate 25 of the connecting shaft. When the blank rotates to a specific angle, that is, when the ball 213 slides to the positioning hole 253, the ball 213 will slide into the positioning hole 253 under the action of the spring 212 to achieve rapid positioning; at the same time, the piston 19 in the cylinder 14 is pushed inward, and then drives the positioning pin 15 on the piston 19 to move. The positioning pin 15 passes through the side plate 21 and pops out into the pin hole 251 of the end plate 25 of the support connecting shaft to achieve the purpose of angle locking, as Figure 5 shown; when the tooling needs to be rotated to change the working position, the piston 19 in the cylinder 14 retracts, and at the same time drives the positioning pin 15 to withdraw from the pin hole 251 to achieve the purpose of unlocking, as Figure 6 shown. The piston 19 is arranged in the cylinder 14, and the cylinder 14 drives the piston 19 to reciprocate in the cavity of the cylinder 14 along the axis direction of the piston 19 through gas, and then drives the positioning pin 15 on the piston 19 to move. The mechanism of the gas in the cylinder driving the piston to reciprocate to lock and unlock the positioning pin 15 will be further described in detail below.

[0028] See Figures 7 to 9, it penetrates into the inner side of the cylinder 14 body along the cylinder axis direction from the cylinder head 18 and extends in the radial direction to form a first air hole 142. The first air hole 142 has an L-shaped gas passage and is communicated with the cavity of the cylinder 14. The L-shaped gas passage of the first air hole 142 includes a first section of through hole 1421 arranged parallel to the cylinder axis and a second section of through hole 1422 arranged perpendicular to the cylinder axis. The end of the second section of through hole 1422 intersects with the inner end wall and the inner circumferential side wall of the cylinder 14. The second section of through hole 1422 of the L-shaped gas passage of the first air hole 142 is located inside the piston 19. During the actual processing of the device, for the convenience of operation, during the formation of the second section 1422, a through hole is usually opened on the outer side surface of the cylinder 14, and then the outer section of the through hole is blocked by a plug 145, and the remaining part of the through hole (i.e., the second section 1422) is reserved to form an L-shaped gas passage with the first section 1421.

[0029] It penetrates into the outer side of the cylinder 14 body along the cylinder axis direction from the cylinder head 18 and extends in the radial direction to form a second air hole 143. The second air hole 143 has an L-shaped gas passage and is communicated with the cavity of the cylinder 14. The L-shaped gas passage of the second air hole 143 is located outside the piston 19. When gas enters the cavity of the cylinder 14 through the first air hole 142, it pushes the piston 19 to move outward. When gas enters the cavity of the cylinder 14 through the second air hole 143, it pushes the piston 19 to move inward.

[0031] The L-shaped gas passage of the second air hole 143 includes a first section of through hole 1431 arranged parallel to the cylinder axis and a second section of groove 1432 arranged perpendicular to the cylinder axis. The second section of groove 1432 is located on the outer end wall of the cylinder body.

[0032] As Figure 8 shown, a step 144 is provided at the junction of the second section of through hole 1422 of the L-shaped gas passage of the first air hole 142 and the inner end wall and the inner circumferential side wall of the cylinder 14 to limit the extreme inward movement position of the piston 19. The piston 19 can only be pushed to the position of the step 144 and cannot contact the end face where the ventilation groove 141 is located. When gas enters the cylinder 14 through the first air hole 142, the piston 19 moves inward away from the cylinder head 18. When the piston 19 is pushed to the step 144, the step 144 limits the further movement of the piston 19. A first air cavity 146 is formed between the step 144, the inner end wall of the piston 19 and the inner circumferential side wall of the cylinder.

[0033] As Figure 7 and Figure 9As shown, a second air chamber 147 is also formed between the outer end wall of the piston 19 and the cylinder head 18. When gas enters the cylinder 14 through the L-shaped gas passage of the first air hole 142, the piston 19 in the cylinder 14 is pushed to move outward, that is, in the direction of the cylinder head 18. During this process, the gas in the second air chamber 147 is discharged through the second air hole 143. Similarly, when gas enters the cylinder 14 through the second air hole 143, when the piston 19 moves inward away from the cylinder head 18, the gas in the first air chamber 146 is discharged through the first air hole 143. The first air hole 142 and the second air hole 143 of the cylinder are connected to an external gas source (not shown), and the intake and exhaust of the external gas source are controlled by a peripheral automatic control system.

[0034] The cylinder head 18 is fixed to the outer end face of the cylinder 14 by M6 long screws 17 and M3 screws 16, and the inner end face of the cylinder 14 is fixed to the side plate 21 by screws 20.

[0035] As Figure 7 shown, the end 220 of the connecting rod 22 is approximately cube-shaped. In actual operation, the rotation of the connecting rod can be manually or automatically operated, and the rotation angle is changed by 90 degrees each time. If manual rotation is adopted, the end 220 can be clamped with a wrench. When rotating 90 degrees each time, the ball 213 slides in the ball chute 252. When approaching the positioning hole 253, it will slide into the positioning hole 253 under the action of the spring 212. When the ball 213 enters the positioning hole 253, a signal can be sent to the automatic control system of the gas source through a position sensor (not shown). The automatic control system of the gas source fills the gas in the gas source into the second air chamber 147 of the cylinder through the second air hole 143, thereby pushing the piston 19 to move inward and realizing the locking of the positioning pin 15; after the machining of the workpiece at this station is completed, the automatic control system of the gas source fills the gas in the gas source into the first air chamber 146 of the cylinder through the first air hole 142, thereby pushing the piston 19 to move outward and realizing the unlocking of the positioning pin 15. Then, the end 220 of the operating connecting rod 22 is rotated 90 degrees to continue the machining of the next station. Those skilled in the art should understand that the rotation of the end 220 of the manually operated connecting rod 22 can also be realized through a common automatic control system. The double cylinders in the double-cylinder angle positioning device of the present invention are symmetrically arranged. The above content in this specification is a description of one of the cylinders, and the other cylinder operates synchronously, and its structure and movement mechanism are exactly the same, so no further description will be given.

[0036] Dual-cylinder Angle Positioning Device The dual-cylinder angle positioning device of the present invention is generally used in a milling machine. To ensure stable operation under production forces, four positioning holes are used in combination with positioning pins for locking. Considering the convenience of later use and production efficiency, a two-way cylinder structure is built in. When the cylinder extends, the positioning pins will be pushed out simultaneously and enter the pin holes to achieve the purpose of angle locking. When the tooling needs to be rotated to change the working station, the cylinder retracts and drives the positioning pins to withdraw from the pin holes to achieve the purpose of unlocking. The dual-cylinder angle positioning device of the present invention can process two blanks simultaneously, machining holes at different angles and positions. After machining at one angle, it can be rotated 90 degrees to continue machining at different angles. The dual-cylinder angle positioning device of the present invention has a simple structure, is easy to operate, and has a low manufacturing cost. It can achieve milling of work-piece blanks at different angles and positions through the reciprocating motion of the cylinder piston and multiple-angle rotation of the connecting rod, improving the product yield and production efficiency.

[0037] The above embodiments are only specific implementation manners of the present invention, used to illustrate the technical solutions of the present invention, rather than limiting it. The protection scope of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: Any person skilled in the art within the technical scope disclosed by the present invention can still modify or improve the technical solutions recorded in the foregoing embodiments, or perform equivalent substitution on some of the technical features; and these modifications, changes or substitutions do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A double-cylinder angle positioning device, comprising a support plate, on the left and right sides of the support plate, there are symmetrically provided with support connecting shafts, side plates, cylinders, cylinder heads and pistons arranged in the cavities of the cylinders, wherein, The support connecting shaft includes a connecting rod and an end plate. The support plate is fixedly connected to the end plate. The connecting rod sequentially penetrates through the side plate, the cylinder, and the cylinder head and can rotate around its axis. The piston can reciprocate along its axis under the drive of the gas provided by an external air source within the cavity of the cylinder. It is characterized in that: A plurality of positioning pins are fixed on the piston, and the positioning pins are evenly distributed circumferentially around the axis of the piston; A plurality of pin holes matching the plurality of positioning pins are provided on the end face of the end plate adjacent to the side plate; when the piston moves towards the end plate to the innermost side, the plurality of positioning pins are inserted into the plurality of pin holes; when the piston moves away from the end plate to the outermost side, the plurality of positioning pins are separated from the plurality of pin holes.

2. The double-cylinder angle positioning device according to claim 1, wherein: A plurality of side plate holes penetrating through the thickness of the side plate are provided on the side plate. The plurality of side plate holes are symmetrically arranged with respect to the axis of the connecting rod. A set screw, a spring sleeved on the set screw, and a ball provided at the top of the spring are provided in each side plate hole; a circular ball chute is provided on the end face of the end plate adjacent to the side plate, and a plurality of positioning holes are evenly distributed on the ball chute; when the support connecting shaft rotates, the ball slides within the circular ball chute, and when it rotates to the position of the positioning hole, the ball slides into the positioning hole under the action of the spring, and when the ball slides into the positioning hole, the positioning pin is aligned with the corresponding pin hole.

3. The double-cylinder angle positioning device according to claim 1, characterized in that: The plurality of positioning pins are 4 positioning pins; the plurality of pin holes are 4 pin holes.

4. The double-cylinder angle positioning device according to claim 2 or 3, characterized in that: The plurality of side plate holes are 2 side plate holes.

5. The double-cylinder angle positioning device according to claim 4, characterized in that: A first air hole penetrates into the inner side of the cylinder body along its axis direction from the cylinder head and extends in the radial direction. The first air hole has an L-shaped gas passage and is communicated with the cavity of the cylinder; a second air hole penetrates into the outer side of the cylinder body along its axis direction from the cylinder head and extends in the radial direction. The second air hole has an L-shaped gas passage and is communicated with the cavity of the cylinder.

6. The double-cylinder angle positioning device according to claim 5, characterized in that: The L-shaped gas passage of the first air hole includes a first through hole arranged parallel to the axis of the cylinder and a second through hole arranged perpendicular to the axis of the cylinder. The end of the second through hole intersects with the inner end wall and the inner circumferential side wall of the cylinder. The second through hole of the L-shaped gas passage of the first air hole is located inside the piston; the L-shaped gas passage of the second air hole is located outside the piston; when gas enters the cavity of the cylinder through the first air hole, the piston is pushed to move outward; when gas enters the cavity of the cylinder through the second air hole, the piston is pushed to move inward.

7. The double-cylinder angle positioning device according to claim 5, wherein: The L-shaped gas passage of the second air hole includes a first through hole arranged parallel to the axis of the cylinder and a second groove arranged perpendicular to the axis of the cylinder. The second groove is located on the outer end wall of the cylinder body.

8. The double-cylinder angle positioning device according to claim 6, characterized in that: A step is provided at the intersection of the second through hole of the L-shaped gas passage of the first air hole and the inner end wall and the inner circumferential side wall of the cylinder to define the limit movement position of the piston towards the inner side.

9. The double-cylinder angle positioning device according to claim 1, wherein: Blank fixing mechanisms are provided on both the upper and lower surfaces of the support plate. Each blank fixing mechanism includes: a bottom plate, a left support and a right support fixed on the bottom plate, a first V-groove plate provided at the top of the left support, a second V-groove plate provided at the top of the right support, a third V-groove plate provided on the bottom plate and located between the left support and the right support, a left V-shaped pressing plate and a right V-shaped pressing plate.

10. The double-cylinder angle positioning device according to claim 1, characterized in that: It further includes a horizontally placed base, the side plate is vertically fixed on the base, and the axis of the support plate is parallel to the base.

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