Positioning device and positioning method

Abstract

The application discloses a positioning device and a positioning method, which comprise a clamping mechanism, an air tank and a positioning rod; the clamping mechanism comprises a first supporting arm, a second supporting arm and a top connecting piece; the first supporting arm and the second supporting arm are fixedly arranged with the top connecting piece; the first supporting arm and the second supporting arm are located on the two sides of the air tank; the first supporting arm can move left and right relative to the air tank; the second supporting arm can move left and right relative to the air tank; most of the positioning rod is located below the air tank; the positioning rod is fixedly arranged with the air tank; the positioning rod moves up and down with the air tank or the positioning rod is slidingly connected with the air tank; the positioning rod can move up and down relative to the air tank; the first supporting arm has a first positioning surface; the second supporting arm has a second positioning surface; the first positioning surface and the second positioning surface are oppositely arranged; the positioning rod has a third positioning surface below. The application can effectively position a workpiece to be positioned.

Description

Technical Field

[0001] This invention belongs to the field of automated equipment. Background Technology

[0002] Automotive parts include components such as valves and containers. These components require sealing tests, which necessitate clamping and securing them. This requires the use of positioning mechanisms. When using positioning mechanisms to position components, the clamping direction must be taken into account. Summary of the Invention

[0003] The purpose of this invention is to provide a positioning device and positioning method that can effectively locate objects.

[0004] To achieve the above objectives, the following technical solution is adopted:

[0005] A positioning device includes a clamping mechanism. The positioning device includes an air box and a positioning rod. The clamping mechanism includes a first arm, a second arm, and a top connector. The first arm and the second arm are movably connected to the top connector. The first arm and the second arm are located on opposite sides of the air box. The first arm and the second arm are movable left and right relative to the air box. Most of the positioning rod is located below the air box. The positioning rod is fixedly connected to the air box and can move up and down with the air box, or the positioning rod can be slidably connected to the air box and can move up and down relative to the air box.

[0006] The first support arm has a first positioning surface, the second support arm has a second positioning surface, and the first positioning surface and the second positioning surface are arranged opposite to each other; a third positioning surface is located below the positioning rod.

[0007] To achieve the above objectives, the following technical solution is adopted: a positioning method for a workpiece to be positioned, comprising a positioning device, the positioning device including a clamping mechanism, an air box, and a positioning rod, most of the positioning rod being located below the air box; the clamping mechanism including a first support arm, a second support arm, a top connector, a piston rod, and a connecting rod; the positioning device including a first air supply line, a second air supply line, a third air supply line, a fourth air supply line, a first chamber, a second chamber, a third chamber, and a fourth chamber;

[0008] Place the workpiece to be positioned into the fixture, and then put the fixture into the box equipped with the positioning device.

[0009] A certain pressure of gas is input into the first gas supply pipeline, so that the gas pressure in the first chamber is greater than the gas pressure in the second chamber. The gas in the first chamber pushes the positioning rod to move downward, and the third positioning surface below the positioning rod abuts against one side of the workpiece to be positioned.

[0010] Gas at a certain pressure is input into the third and fourth gas supply lines, which increases the pressure in the third chamber, causing the piston rod to move relative to the gas box. The piston rod drives the first arm and the top connector to move in a direction away from the second arm, so that the second arm abuts against the gas box and the second positioning surface of the second arm abuts against the workpiece to be positioned. The pressure in the fourth chamber increases, driving the drive rod to move toward the second arm, and the first positioning surface abuts against the other side of the workpiece to be positioned.

[0011] The above-mentioned technical solution of the present invention includes a clamping mechanism, an air box, and a positioning rod. The first arm and the second arm of the clamping mechanism are located on both sides of the air box. The first arm and the second arm are movable relative to the air box. The first arm moves left and right relative to the air box, and the second arm moves left and right relative to the air box. The positioning rod is movable up and down relative to the air box. The first arm has a first positioning surface, and the second arm has a second positioning surface. Most of the positioning rod is located below the air box, and a third positioning surface is located below the positioning rod. The first positioning surface, the second positioning surface, and the third positioning surface can achieve effective positioning of the workpiece to be positioned, and the overall structure is compact. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of a portion of the positioning device of the present invention after the workpiece to be positioned is installed, according to one embodiment of the positioning device of the present invention.

[0013] Figure 2 for Figure 1 A schematic diagram of the structure shown from another perspective;

[0014] Figure 3 This is a schematic diagram of the top connector according to one embodiment of the present invention;

[0015] Figure 4 This is a partial structural diagram of an air box and a partial clamping mechanism according to one embodiment of the present invention;

[0016] Figure 5 for Figure 1 A perspective structural diagram of the clamping mechanism in the middle;

[0017] Figure 6 for Figure 1 A partial cross-sectional view of the positioning device in the clamping state;

[0018] Figure 7 for Figure 1 Another cross-sectional view of the positioning device in the clamping state;

[0019] Figure 8 This is a cross-sectional schematic diagram of the connection between the air box and the positioning rod.

[0020] Figure 9A schematic diagram of the positioning device in the released state;

[0021] Figure 10 for Figure 9 A partial cross-sectional view of the structure;

[0022] Figure 11 This is a cross-sectional structural schematic diagram of another embodiment of the positioning device of the present invention. Detailed Implementation

[0023] Reference Figures 1-10 , Figures 1-10 The diagram illustrates a positioning device 100, which can be used for positioning and fixing some automotive parts, such as for sealing testing equipment.

[0024] The positioning device 100 includes a clamping mechanism 30, an air box 40, and a positioning rod 50. The clamping mechanism 30 includes a first arm 301, a second arm 302, a top connector 303, a piston rod 304, and a connecting rod 305. The first arm 301 and the second arm 302 are driven by the top connector 303. The first arm 301 and the second arm 302 are located on both sides of the air box 40. The first arm 301 can move left and right relative to the air box 40, and the second arm 302 can move left and right relative to the air box 40. Part of the piston rod 304 is located inside the air box 40. The piston rod 304 is fixed to the first arm 301, or the piston rod 304 and the first arm 301 are in the same direction along the length of the piston rod 304. The piston rod 304 is slidably connected to the gas box 40 by the gas pressure in the first chamber 60. The connecting rod 305 is partially located inside the gas box 40. The connecting rod 305 is fixed to the second support arm 302 or the connecting rod 305 is limited in the length direction of the second support arm 302. The connecting rod 305 is slidably connected to the gas box 40. The first support arm 301 has a first positioning surface 3011, and the second support arm 302 has a second positioning surface 3021. The first positioning surface 3011 and the second positioning surface 3021 are arranged opposite to each other. Most of the positioning rod 50 is located below the gas box 40, and the positioning rod 50 has a third positioning surface 501 below it.

[0025] The third positioning surface 501 is used to position the workpiece to be positioned and the fixed fixture, ensuring the vertical positioning of the workpiece. The first positioning surface 3011 and the second positioning surface 3021 are arranged opposite to each other, and are used to position the workpiece in the horizontal direction, preventing displacement of the workpiece in the horizontal direction. Through the positioning of the workpiece by the first positioning surface 3011, the second positioning surface 3021, and the third positioning surface 501, the workpiece can be positioned in both vertical and horizontal directions, facilitating subsequent operations, such as seal inspection.

[0026] The top connector can be in the form of a plate, a rod, or other structures.

[0027] In this article, the following references are used for easier description of the direction of movement. Figure 1 The direction shown, "up and down direction" refers to Figure 1 In the direction of D, "left and right directions" refers to Figure 1 In the L direction.

[0028] The term "sliding connection" refers to a connection where one component can slide relative to another, and the two components can be connected together.

[0029] The terms "first positioning surface 3011", "second positioning surface 3021" and "third positioning surface 501" refer to the surfaces on the positioning device 100 used for positioning the workpiece to be positioned.

[0030] The term "first positioning surface and second positioning surface are set opposite each other" includes both the first positioning surface and the second positioning surface being set directly opposite each other and the first positioning surface and the second positioning surface being set at an angle to each other.

[0031] The transmission configuration of the first arm 301, the second arm 302 and the top connector 303 includes the first arm, the second arm and the top connector being fixedly configured, and also includes the first arm, the second arm and the top connector being connected by tenon and mortise or other means, or by other detachable means.

[0032] In one embodiment, the positioning rod 50 is slidably connected to the air box 40, and the positioning rod 50 can move up and down relative to the air box 40. The air box 40 has a first hole 402, and part of the positioning rod 50 is located in the first hole 402. The peripheral wall of the positioning rod 50 is slidably sealed to the side wall corresponding to the first hole 402. There is a space between the end of the positioning rod 50 and the bottom wall corresponding to the first hole 402, which is defined as the first chamber 70. There is a space between the peripheral wall of the positioning rod 50 and the side wall corresponding to the first hole 402, which is defined as the second chamber 80. The second chamber 80 is located below the first chamber 70. One side of the end of the positioning rod 50 is subjected to the gas force of the first chamber 70, and the other side of the end of the positioning rod 50 is subjected to the gas force of the second chamber 80.

[0033] The positioning device 100 includes a first air source, which is connected to a first air supply line 403;

[0034] The air box 40 has a first air supply line 403 and a second air supply line 404. The first air supply line 403 is connected to the first chamber 70, and the second air supply line 404 is connected to the second chamber 80. The first chamber 70 and the second chamber 80 are not connected.

[0035] A first air supply line 403 and a second air supply line 404 are provided in the air box 40, so that the positioning rod 50 can move through the gas pressure difference in the first chamber 70 connected to the first air supply line 403 and the second chamber 80 connected to the second air supply line 404, so that the positioning rod 50 can slide relative to the air box 40 and the positioning rod 50 can abut against the workpiece to be positioned.

[0036] The positioning device 100 has a first working point and a second working point. At the first working point, the pressure in the first chamber 70 is greater than the pressure in the second chamber 80, and the gas in the first chamber 70 pushes the positioning rod 50 to move downward. At the second working point, the pressure in the second chamber 80 is greater than the pressure in the first chamber 70, and the gas in the second chamber 80 pushes the positioning rod 50 to move upward.

[0037] It should be noted here that "pipeline" refers to a gas passage connected in a pipe-like manner, and is not limited to pipes; it can also be other forms of gas passage.

[0038] The positioning rod 50 includes a push rod 502 and a first sealing head 503. The first sealing head 503 is located at the end of the push rod 502 away from the air box 40, and the first sealing head 503 has a third positioning surface 501 on the side facing the workpiece to be positioned.

[0039] The positioning rod 50 is equipped with a first sealing head 503 structure, which can partially extend into the hole of the workpiece to be positioned, or seal the hole of the workpiece to be positioned on the surface of the workpiece. When the workpiece to be positioned is filled with gas of a certain pressure for testing the sealing performance, the positioning rod 50 is sealed by the gas pressure in the gas box 40. In this way, the positioning rod 50 can be subjected to the pressure of the gas in the workpiece to be positioned and the gas pressure in the gas box 40. The pressure can be balanced to a certain extent, so that the positioning force of the positioning device 100 on the workpiece to be positioned is not likely to damage the shape of the workpiece.

[0040] The clamping mechanism 30 includes a second air source and a third air supply line 307, with the second air source and the third air supply line 307 connected. The air box 40 has a second hole 401, and a portion of the piston rod 304 is located in the second hole 401. The first peripheral wall 3041 of the piston rod 304 is sealed to the side wall corresponding to the second hole 401 of the air box 40. A space is left between the first end 3042 of the piston rod 304 and the bottom wall corresponding to the second hole 401, which is defined as the third chamber 60. The third chamber 60 is connected to the third air supply line 307. When the gas pressure in the third chamber 60 changes, the size of the third chamber 60 can change. The piston rod 304 can move due to the change in gas pressure in the third chamber 60, so that the first support arm 301 can drive the top connector 303 to move.

[0041] The movement of the piston rod 304 is controlled by the pressure of the gas in the third chamber 60, which in turn drives the top connector 303 to move. Since the top connector 303 and the second arm 302 are fixedly installed, the second arm 302 will also move due to the movement of the top connector 303. This allows the first positioning surface 3011 of the first arm 301 and the second positioning surface 3021 of the second arm 302 to be used for positioning the workpiece to be positioned. This positioning is achieved by the movement of the piston rod 304. The force on the first arm 301 and the second arm 302 on the workpiece to be positioned is relatively balanced, so that when the first arm 301 and the second arm 302 clamp the workpiece to be positioned, even if the workpiece to be positioned is a hollow structure, the integrity of the shape of the workpiece to be positioned can be effectively maintained.

[0042] Thus, when the workpiece 92 to be clamped, located at least partially between the first and second positioning surfaces, has a sealing point at the first or second positioning surface, or in other words, has a sealing point on the side of the first or second positioning surface, sealing one side provides a corresponding positioning support point on the other side. This ensures that the original positioning reference surface of the workpiece 92 to be clamped will not shift due to the force applied to the side of the first or second positioning surface. The positioning of the workpiece to be clamped by the first and second positioning surfaces is achieved by controlling the movement of the piston rod 304 through the gas pressure in the first chamber 60. The movement of the piston rod drives the movement of the second arm, and the first arm drives the movement of the drive rod through the pressure change of the gas in the second chamber. This allows the drive rod and the second arm to be used for positioning the workpiece to be clamped differently from the positioning reference surface. Since the movement of the second arm is affected by the first chamber, and the second chamber is also located inside the first arm, the structure is simple. The air source connected to the first and second chambers can be placed behind the fixture, making it more aesthetically pleasing and the structure more compact.

[0043] The third air supply line 307 is located inside the first arm 301. The piston rod 304 has an internal channel 3043, which connects the third chamber 60 and the third air supply line 307.

[0044] The clamping mechanism 30 has a pin 308, the piston rod 304 has a limiting groove 3044, a part of the pin 308 is located in the top connector 303, a part of the pin 308 is located in the limiting groove 3044, a part of the pin 308 is located in the first support arm 301, and the pin 308, the first support arm 301, and the piston rod 304 are fixedly arranged.

[0045] A third air supply line 307 is provided inside the first arm 301, and an internal channel 3043 is provided inside the piston rod 304. The internal channel 3043 is used to connect the third chamber 60 and the third air supply line 307. The air passage is arranged inside, making the structure more compact.

[0046] The piston rod 304 is fixed to the first support arm 301 and the top connector 303 by a pin 308, making the structure simple to install.

[0047] The clamping mechanism 30 includes a fourth air supply line 309, which is located inside the first support arm 301. The second air source is connected to the fourth air supply line 309. The gas pressure in the third air supply line 307 is the same as the gas pressure in the fourth air supply line 309, and the third air supply line 307 is connected to the fourth air supply line 309.

[0048] The clamping mechanism 30 has a fourth chamber 313, which is connected to the fourth gas supply line 309. The clamping mechanism 30 has a drive rod 310, and the first support arm 301 has a first connecting hole 3013. A portion of the drive rod 310 is located in the first connecting hole 3013. The second peripheral wall 3101 of the drive rod 310 is sealed to the side wall corresponding to the first connecting hole 3013. A space is left between the second end 3104 of the drive rod 310 and the bottom wall corresponding to the first connecting hole 3013. This space is defined as the fourth chamber 313. The drive rod 310 is slidably connected to the first support arm 301. The drive rod 310 can move under the gas pressure in the fourth chamber 313.

[0049] A fourth air supply line 309 is provided inside the first support arm 301, and the fourth air supply line 309 and the third air supply line 307 come from the same air source, the second air source. In this way, the gas pressure in the third air supply line 307 and the fourth air supply line 309 is the same, so that the first support arm 301 and the second support arm 302 apply the same force to the workpiece to be positioned, which is beneficial to the uniform force on the workpiece to be positioned.

[0050] The clamping mechanism 30 has a third working point and a fourth working point. When the clamping mechanism 30 is at the third working point, gas with a certain pressure is input into the third air supply line 307 and the fourth air supply line 309. The pressure in the third chamber 60 increases, causing the piston rod 304 to move relative to the air box 40. The piston rod 304 drives the first support arm 301 and the top connecting piece 303 to move in a direction relative to the second support arm 302, so that the second support arm 302 abuts against the air box 40, and the second positioning surface 3021 of the second support arm 302 abuts against the workpiece to be positioned. The pressure in the fourth chamber 313 increases, driving the drive rod 310 to move towards the second support arm 302, and the first positioning surface 3011 abuts against the workpiece to be positioned.

[0051] When the clamping mechanism 30 is at the fourth working point, air is drawn from the third air supply line 307 and the fourth air supply line 309, reducing the pressure in the third chamber 60. This causes the piston rod 304 to move relative to the air box 40. The first support arm 301 and the top connecting piece 303 drive the piston rod 304 to move toward the second support arm 302. The second support arm 302 moves away from the first support arm 301. This reduces the pressure in the fourth chamber 313, causing the drive rod 310 to move away from the second support arm 302. The first positioning surface 3011 and the second positioning surface 3021 disengage from the workpiece to be positioned.

[0052] In this article, the terms "first working point," "second working point," "third working point," and "fourth working point" do not have a sequential relationship. They are used to illustrate different situations, and the second working point can also occur before the first working point. Similarly, the sequential words "first," "second," "third," and "fourth" used in this article are for better distinguishing the structure and are not used as sequential terms.

[0053] The clamping mechanism 30 has an elastic element 311, the air box 40 has a third hole 405 facing the second support arm 302, a part of the connecting rod 305 is located in the third hole 405, the elastic element 311 is sleeved on the part of the connecting rod 305, the elastic element 311 is located in the third hole 405, one end of the elastic element 311 is fixed or limited to the wall corresponding to the third hole 405 of the air box 40, and the other end of the elastic element 311 is fixed or limited to the second support arm 302, and the connecting rod 305 can move relative to the air box 40.

[0054] The connecting rod 305 is connected to the air box 40 by the elastic element 311. When the top connecting member 303 moves towards the air box 40, the connecting rod 305 exerts a compressive force on the elastic element 311. When the top connecting member 303 moves away from the air box 40, the elastic element 311 exerts a certain rebound force on the second arm 302. In this way, the second arm 302 will release the workpiece to be positioned.

[0055] The air box 40 has a protrusion 406 on its top and a groove 3031 on its top connector 303. The protrusion 406 is located in the groove 3031. With the extension direction from the first support arm 301 to the second support arm 302 as the length direction, the length of the groove 3031 along the length direction is greater than the length of the protrusion 406, and the protrusion 406 can move within the groove 3031. The clamping mechanism 30 has a plug 312, and the first support arm 301 has a second connecting hole 3014. The piston rod 304 extends into the second connecting hole 301. 4. The plug 312 abuts against the piston rod 304, and the plug 312 is fixedly set with the first support arm 301. During processing, the first support arm 301 is first processed to form a second connecting hole 3014. The piston rod 304 is inserted into the second connecting hole 3014. One end of the piston rod 304 leaves a space between itself and the wall inside the air box 40 and the corresponding part at the bottom of the piston rod 304. The other end of the piston rod 304 abuts against the plug 312. In this way, the assembly between the piston rod 304 and the first support arm 301 is convenient and the processing is simple.

[0056] The second arm 302 has a third connecting hole 3022, a portion of the connecting rod 305 extends into the third connecting hole 3022, the connecting rod 305 has a flange portion 3051, the outer diameter of the flange portion 3051 is larger than the diameter of the third connecting hole 3022, and the connecting rod 305 and the second arm 302 are limited in position.

[0057] The connecting rod 305 and the second arm 302 are limited by the flange portion 3051. When the elastic element 311 has a restoring force on the second arm 302, the second arm 302 can drive the connecting rod 305 to move. This structure is simple.

[0058] The drive rod 310 has a second sealing head 3102 and a rod body 3103. The second sealing head 3102 is connected to the rod body 3103 in a limiting manner. The second sealing head 3102 has a sealing element 3121 and a main body 3122. The main body 3122 has a limiting groove 3123. At least a portion of the sealing element 3121 is located in the limiting groove 3123. One end face of the sealing element 3121 is positioned opposite to the workpiece to be positioned. A first positioning surface 3011 is located on the sealing element 3121. The sealing element 3121 can be a sealing ring or the like.

[0059] When the workpiece to be positioned has an internal cavity, the seal 3121 can be partially located in the hole of the workpiece to be positioned, or the seal 3121 can seal the periphery corresponding to the hole of the workpiece to be positioned.

[0060] The distance the piston rod moves relative to the connecting box is less than the distance the drive rod moves relative to the first support arm. As a specific case, the length of the second chamber 313 along the length of the drive rod is greater than the length of the first chamber 60 along the length of the drive rod. Thus, when the piston rod moves along the L direction in a direction relatively away from the connecting box, the drive rod moves along the L direction in a direction closer to the connecting box, and the moving distance is greater than the moving distance of the piston rod. In this way, the drive rod can be used to clamp the workpiece to be clamped.

[0061] As another implementation method, refer to Figure 11 The positioning device may also include a cylinder 91, the drive end of the cylinder 91 is fixed to the top connector 303, and the top connector 303 can move up and down under the action of the cylinder.

[0062] The positioning rod 50 is fixedly set to the air box 40, or the positioning rod 50 is connected to the air box 40 in the upper and lower directions, and the third positioning surface 501 can contact the workpiece to be positioned.

[0063] The positioning rod 50 is driven by the cylinder to move the air box 40. The cylinder makes the positioning rod 50 move within a certain stroke, so that the positioning rod 50 can contact and position the workpiece to be positioned under the force, and press the workpiece to be positioned to the fixed fixture 20, so that the workpiece to be positioned is positioned in the vertical direction.

[0064] The positioning device 100 described above can be used for positioning a workpiece to be positioned. The positioning method of the workpiece to be positioned is described below.

[0065] A method for positioning a workpiece includes a positioning device 100. The positioning device 100 includes a clamping mechanism 30, an air box 40, and a positioning rod 50. Most of the positioning rod 50 is located below the air box 40. The clamping mechanism 30 includes a first support arm 301, a second support arm 302, a top connector 303, a piston rod 304, and a connecting rod 305. The positioning device 100 includes a third air supply line 307, a fourth air supply line 309, a first air supply line 403, a second air supply line 404, a third chamber 60, a fourth chamber 313, a first chamber 70, and a second chamber 80.

[0066] Place the workpiece to be positioned into the fixture, which is located inside the box.

[0067] A certain pressure of gas is input into the first gas supply line 403, so that the gas pressure in the first chamber 70 is greater than the gas pressure in the second chamber 80. The gas in the first chamber 70 pushes the positioning rod 50 to move downward, and the third positioning surface 501 below the positioning rod 50 abuts against one side of the workpiece to be positioned.

[0068] Gas at a certain pressure is supplied to the third gas supply line 307 and the fourth gas supply line 309, which increases the pressure in the third chamber 60. This causes the piston rod 304 to move relative to the gas box 40. The piston rod 304 drives the first support arm 301 and the top connecting piece 303 to move in a direction relative to the second support arm 302, so that the second support arm 302 abuts against the gas box 40, and the second positioning surface 3021 of the second support arm 302 abuts against the workpiece to be positioned. The pressure in the fourth chamber 313 increases, driving the drive rod 310 to move toward the second support arm 302, and the first positioning surface 3011 abuts against the other side of the workpiece to be positioned.

[0069] During the positioning process, the third positioning surface 501 is first aligned with the workpiece to be positioned, thus positioning the workpiece vertically. Then, the workpiece is positioned horizontally, which helps to prevent the workpiece from shifting on the fixed fixture.

[0070] The first arm 301 has a third air supply line 307 and a fourth air supply line 309 inside. When the second air source supplies air, the gas pressure in the third air supply line 307 and the fourth air supply line 309 is the same. The gas in the third chamber 60 acts on the piston rod 304 and the gas in the fourth chamber 313 acts on the drive rod 310 at the same time, so that the left and right sides of the workpiece to be positioned can be clamped by applying force at the same time, which is beneficial to the positioning of the workpiece.

[0071] The drive rod 310 has a second sealing head 3102 and a rod body 3103. The second sealing head 3102 is limitedly connected to the rod body 3103. The second sealing head 3102 has a sealing element 3121 and a main body 3122. The main body 3122 has a limiting groove 3123. At least a portion of the sealing element 3121 is located in the limiting groove 3123. One end face of the sealing element 3121 is disposed opposite to the workpiece to be positioned. The first positioning surface 3011 is located on the sealing element 3121.

[0072] The workpiece to be positioned can have an internal flow channel structure. The second sealing head 3102 can be used to seal the inside of the workpiece. When the workpiece is positioned by force, part of the second sealing head 3102 can be located inside the hole of the workpiece or seal the peripheral wall corresponding to the hole of the workpiece. In this way, one side of the second sealing head 3102 is subjected to the pressure of the gas in the fourth chamber 313, and the other side of the second sealing head 3102 is subjected to the pressure of the gas inside the workpiece. This is conducive to the balance of forces on both sides of the second sealing head 3102 and is more conducive to the positioning of the workpiece with an internal hollow structure.

[0073] The positioning rod 50 includes a top rod 502 and a first sealing head 503. The first sealing head 503 is located at the end of the top rod 502 away from the air box 40. The first sealing head 503 has a third positioning surface 501 on the side facing the workpiece to be positioned. The first sealing head 503 is used for sealing the inside of the workpiece to be positioned.

[0074] Thus, when the workpiece to be positioned has a hole to be sealed facing the third positioning surface 501 and a hole to be sealed facing the drive rod 310, the positioning device 100 can seal the hole to be sealed while positioning and clamping it, sealing and clamping the holes to be sealed in different directions, and maintaining the integrity of the workpiece to be positioned in a flexible clamping manner.

[0075] It should be noted that the above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described in the present invention. For example, the directional definitions such as "front", "back", "left", "right", "up", and "down" are used. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still combine, modify or substitute the present invention with each other. All technical solutions and improvements that do not depart from the spirit and scope of the present invention should be covered within the scope of the claims of the present invention.

Claims

1. A positioning device, comprising a clamping mechanism, characterized in that, The positioning device includes an air box and a positioning rod; the clamping mechanism includes a first arm, a second arm, and a top connector. The first arm and the second arm are movably connected to the top connector. The first arm and the second arm are located on both sides of the air box. The first arm can move left and right relative to the air box, and the second arm can move left and right relative to the air box. Most of the positioning rod is located below the air box. The positioning rod is fixedly connected to the air box and moves up and down with the air box; or the positioning rod is slidably connected to the air box and can move up and down relative to the air box. The first support arm has a first positioning surface, the second support arm has a second positioning surface, and the first positioning surface and the second positioning surface are arranged opposite to each other; a third positioning surface is located below the positioning rod; The clamping mechanism includes a piston rod and a connecting rod. A portion of the piston rod is located inside the gas box. The piston rod is fixed to the first support arm or the piston rod and the first support arm are limited along the length direction of the piston rod. The piston rod is slidably connected to the gas box. A portion of the connecting rod is located inside the gas box. The connecting rod is fixed to the second support arm or the connecting rod and the second support arm are limited along the length direction of the second support arm. The connecting rod is slidably connected to the gas box. The clamping mechanism includes a third gas supply line. The gas box has a second hole. A portion of the piston rod is located in the second hole. The first peripheral wall of the piston rod is sealed to the side wall corresponding to the second hole of the gas box. A space is left between the first end of the piston rod and the bottom wall corresponding to the second hole, defined as a third chamber. The third chamber is connected to the third gas supply line. The size of the third chamber is variable when the gas pressure inside the third chamber changes. The piston rod can be controlled by the third chamber. The first arm moves due to changes in internal gas pressure, causing the top connector to move, which in turn moves the second arm. The first arm can move left and right relative to the gas box due to the gas pressure in the third chamber. The clamping mechanism includes a fourth gas supply line located inside the first arm. The first arm has a first connecting hole. The clamping mechanism has a drive rod, part of which is located in the first connecting hole. The second peripheral wall of the drive rod is sealed to the side wall corresponding to the first connecting hole. A space is left between the second end of the drive rod and the bottom wall corresponding to the first connecting hole, which is defined as the fourth chamber. The drive rod is slidably connected to the first arm and can move due to the gas pressure in the fourth chamber. The first positioning surface is located at the end of the drive rod. The gas pressure in the third and fourth gas supply lines is the same, and the third and fourth gas supply lines are connected.

2. The positioning device according to claim 1, characterized in that, The positioning rod is slidably connected to the air box, the air box has a first hole, a portion of the positioning rod is located in the first hole, the peripheral wall of the positioning rod is slidably sealed to the side wall corresponding to the first hole, a space is left between the end of the positioning rod and the bottom wall corresponding to the first hole, this space is defined as the first chamber, a space is left between the peripheral wall of the positioning rod and the side wall corresponding to the first hole, this space is defined as the second chamber, the second chamber is located below the first chamber, one side of the end of the positioning rod is subjected to the gas force of the first chamber, and the other side of the end of the positioning rod is subjected to the gas force of the second chamber; The positioning device includes a first air source, which is connected to a first air supply pipeline; The gas box has a first gas supply line and a second gas supply line. The first gas supply line is connected to the first chamber, and the second gas supply line is connected to the second chamber. The first chamber and the second chamber are not connected.

3. The positioning device according to claim 2, characterized in that, The positioning device has a first working point and a second working point. At the first working point, the pressure in the first chamber is greater than the pressure in the second chamber, and the gas in the first chamber pushes the positioning rod to move downward. At the second working point, the pressure in the second chamber is greater than the pressure in the first chamber, and the gas in the second chamber pushes the positioning rod to move upward. The positioning rod includes a top rod and a first sealing head, the first sealing head being located at the end of the top rod away from the air box, and the first sealing head having the third positioning surface on the side facing the workpiece to be positioned.

4. The positioning device according to claim 1, characterized in that, The positioning device includes a cylinder located above the top connector, and the driving end of the cylinder is fixed to the top connector. The top connector can move up and down under the action of the cylinder. The air box drives the positioning rod to move up and down, and the third positioning surface can contact the workpiece to be positioned.

5. The positioning device according to claim 1, characterized in that, The clamping mechanism includes a second air source, which is connected to the third air supply line; the second air source is also connected to the fourth air supply line.

6. The positioning device according to claim 5, characterized in that, The third air supply line is located inside the first support arm, and the piston rod has an internal channel that connects the third chamber and the third air supply line. The clamping mechanism has a pin, the piston rod has a limiting groove, a portion of the pin is located in the top connector, a portion of the pin is located in the limiting groove, a portion of the pin is located in the first support arm, and the pin, the first support arm, and the piston rod are fixedly arranged.

7. The positioning device according to any one of claims 1-6, characterized in that, The clamping mechanism has a third working point and a fourth working point. When the clamping mechanism is at the third working point, gas with a certain pressure is input into the third and fourth air supply lines, increasing the pressure in the third chamber. This causes the piston rod to move relative to the air box, and the piston rod drives the first arm and the top connecting piece to move in a direction relatively away from the second arm, causing the second arm to abut against the air box, and the second positioning surface of the second arm to abut against the workpiece to be positioned. The pressure in the fourth chamber increases, driving the drive rod to move towards the second arm, and the first positioning surface abuts against the workpiece to be positioned. When the clamping mechanism is at the fourth working point, air is drawn from the third and fourth air supply lines, reducing the pressure in the third chamber. This causes the piston rod to move relative to the air box. The first arm and the top connector drive the piston rod to move toward the second arm, and the second arm moves away from the first arm. The pressure in the fourth chamber decreases, causing the drive rod to move away from the second arm. The first and second positioning surfaces disengage from the workpiece to be positioned.

8. The positioning device according to any one of claims 1-6, characterized in that: The clamping mechanism has an elastic element, the air box has a third hole facing the second support arm, a portion of the connecting rod is located in the third hole, the elastic element is sleeved on the portion of the connecting rod, the elastic element is located in the third hole, one end of the elastic element is fixed or limited to the wall corresponding to the third hole of the air box, the other end of the elastic element is fixed or limited to the second support arm, and the connecting rod can move relative to the air box.

9. The positioning device according to any one of claims 1-6, characterized in that: The top of the air box has a protrusion, and the top connector has a groove. The protrusion is located in the groove. With the extension direction from the first support arm to the second support arm as the length direction, the length of the groove along the length direction is greater than the length of the protrusion. The protrusion can move within the groove. The clamping mechanism has a plug. The first support arm has a second connecting hole. The piston rod extends into the second connecting hole. The plug abuts against the piston rod. The plug is fixedly installed with the first support arm. The second arm has a third connecting hole, a portion of the connecting rod extends into the third connecting hole, the connecting rod has a flange portion, the outer diameter of the flange portion is larger than the diameter of the third connecting hole, and the connecting rod is positioned to limit the second arm.

10. A method for positioning a workpiece, comprising the positioning device according to any one of claims 1-9, characterized in that, The positioning device includes a clamping mechanism, an air box, and a positioning rod. Most of the positioning rod is located below the air box. The clamping mechanism includes a first arm, a second arm, a top connector, a piston rod, and a connecting rod. The positioning device includes a first air supply line, a second air supply line, a third air supply line, a fourth air supply line, a first chamber, a second chamber, a third chamber, and a fourth chamber. Place the workpiece to be positioned into the fixture, and then send the fixture into the box equipped with the positioning device. A certain pressure of gas is input into the first gas supply pipeline, so that the gas pressure in the first chamber is greater than the gas pressure in the second chamber. The gas in the first chamber pushes the positioning rod to move downward, and the third positioning surface below the positioning rod abuts against one side of the workpiece to be positioned. Gas at a certain pressure is supplied to the third and fourth gas supply lines, increasing the pressure in the third chamber. This causes the piston rod to move relative to the gas box, and the piston rod drives the first arm and the top connector to move in a direction away from the second arm. This causes the second arm to abut against the gas box, and the second positioning surface of the second arm abuts against the workpiece to be positioned. The pressure in the fourth chamber increases, and the drive rod is forced to move towards the second arm. The first positioning surface abuts against the other side of the workpiece to be positioned.

11. The positioning method according to claim 10, characterized in that, The drive rod has a second sealing head and a rod body. The second sealing head is connected to the rod body for limiting. The second sealing head has a sealing element and a main body. The main body has a limiting groove. At least a portion of the sealing element is located in the limiting groove. One end face of the sealing element is disposed opposite to the workpiece to be positioned. The first positioning surface is located on the sealing element. The second sealing head is used for sealing the interior of the workpiece to be positioned.

12. The positioning method according to claim 10 or 11, characterized in that, The positioning rod includes a top rod and a first sealing head. The first sealing head is located at the end of the top rod away from the air box. The first sealing head has the third positioning surface on the side facing the workpiece to be positioned. The first sealing head is used for sealing the inside of the workpiece to be positioned.

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