A clamp

Abstract

The present application discloses a kind of clamp, including first support arm, second support arm, top connecting piece, connecting box, piston rod, connecting rod and drive rod, connecting box is at least partially between first support arm and second support arm, part of piston rod is inside first support arm, piston rod is fixed with first support arm or piston rod is limited with first support arm in the length direction of piston rod, part of piston rod is inside connecting box, first support arm, second support arm and top connecting piece transmission connection, piston rod and connecting box sliding connection, piston rod can be moved by gas pressure in first chamber, so that first support arm can drive top connecting piece to move, drive rod can be moved by gas pressure in second chamber;Drive rod has first locating surface, second support arm has second locating surface, first locating surface and second locating surface are oppositely arranged, effective positioning.

Description

Technical Field

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

[0002] For components such as valves and containers that require sealing testing, one common method is helium sealing. Helium sealing requires clamping and securing the components, which necessitates the use of fixtures. In some cases, such as when a component has multiple sealing or positioning points, the clamping process needs to consider more factors, especially when the positioning surfaces of multiple sealing test points are not on the same side. For example, when the location of the sealing test point and the positioning reference surface are on different sides, finding a simple way to position the sealing test point without affecting other positioning points is a major challenge in fixture design. Summary of the Invention

[0003] The purpose of this invention is to provide a clamp with a simple structure and convenient positioning.

[0004] To achieve the above objectives, the following technical solution is adopted: A clamp, comprising a first arm and a second arm, the clamp having a top connector, a connecting box, a piston rod, a connecting rod, and a drive rod, the connecting box being at least partially located between the first arm and the second arm, a portion of the piston rod being located inside the first arm, the piston rod being fixed to the first arm or the piston rod being limited by the first arm in the length direction of the piston rod, a portion of the piston rod being located inside the connecting box, the first arm being driven by the top connector, the second arm being driven by the top connector, the clamp having a first air supply line and a second air supply line, and the clamp having a first cavity. The first air supply line is connected to the first chamber, the piston rod is slidably connected to the connecting box, and the piston rod can move under the gas pressure in the first chamber, so that the first support arm can drive the top connecting piece to move. The clamp has a second chamber, the second air supply line is connected to the second chamber, a portion of the drive rod is located inside the first support arm, the drive rod is slidably connected to the first support arm, and the drive rod can move under the gas pressure in the second chamber. The drive rod has a first positioning surface, the second support arm has a second positioning surface, the first positioning surface is used to face one side of the workpiece to be clamped, and the second positioning surface is used to face the other side of the workpiece to be clamped.

[0005] The above-described technical solution of the present invention includes a first air supply line, a second air supply line, a first chamber, and a second chamber. The piston rod can move under the gas pressure in the first chamber, causing the first support arm to drive the top connecting member to move. Since the top connecting member and the second support arm are connected in a transmission manner, the top connecting member can drive the second support arm to move. The driving rod is slidably connected to the first support arm and can move under the gas pressure in the second chamber. The driving rod has a first positioning surface, and the second support arm has a second positioning surface. The first positioning surface and the second positioning surface can be used for positioning the workpiece to be clamped. Thus, the fixture is not only simple in structure but also easy to position. Attached Figure Description

[0006] Figure 1 This is a schematic diagram of a portion of the fixture of the present invention after the workpiece to be clamped is installed, according to one embodiment of the fixture of the present invention.

[0007] Figure 2 for Figure 1 A schematic diagram of the structure shown from another perspective;

[0008] Figure 3 This is a schematic diagram of the top connector according to one embodiment of the present invention;

[0009] Figure 4 This is a partial structural diagram of a connecting box and a partial clamping mechanism according to one embodiment of the present invention;

[0010] Figure 5 for Figure 1 A perspective structural diagram of the clamping mechanism in the middle;

[0011] Figure 6 for Figure 1 A cross-sectional view of the clamp in the clamping state;

[0012] Figure 7 for Figure 1 A cross-sectional view of another part of the fixture in the clamping state;

[0013] Figure 8 A cross-sectional view of the connection between the connecting box and the positioning rod;

[0014] Figure 9 This is a schematic diagram of the structure in the released state of the clamp;

[0015] Figure 10 for Figure 9 A partial cross-sectional view of the structure;

[0016] Figure 11 This is a cross-sectional schematic diagram of another embodiment of the clamp of the present invention. Detailed Implementation

[0017] Reference Figures 1-10 , Figures 1-10 A clamp 30 is illustrated, which can be used for positioning and fixing some parts, for example, it can be applied to sealing testing equipment.

[0018] A clamp 30 includes a first arm 301 and a second arm 302. The clamp 30 has a first air supply line 307 and a second air supply line 309. The clamp 30 has a top connector 303, a connecting box 40, a piston rod 304, a connecting rod 305, and a drive rod 310. The connecting box 40 is at least partially located between the first arm 301 and the second arm 302. A portion of the piston rod 304 is located inside the first arm 301. The piston rod 304 is fixed to the first arm 301 or the piston rod 304 is limited to the first arm 301 in the length direction of the piston rod 304. A portion of the piston rod 304 is located inside the connecting box 40. The first arm 301 and the top connector 303 are driven together. The second arm 302 and the top connector 303 are also driven together. The clamp 30 has a first chamber 60, with a first gas supply line 307 connected to the first chamber 60. A piston rod 304 can move under the gas pressure within the first chamber 60, allowing the piston rod 304 to slide against the connecting box 40, enabling the first support arm 301 to move the top connecting piece 303. The clamp 30 has a second chamber 313, with a second gas supply line 309 connected to the second chamber 313. A portion of the drive rod 310 is located inside the first support arm 301, and the drive rod 310 is slidably connected to the first support arm 301. The drive rod 310 can move under the gas pressure within the second chamber 313. The drive rod 310 has a first positioning surface 3011, and the second support arm 302 has a second positioning surface 3021, with the first positioning surface 3011 and the second positioning surface 3021 arranged opposite to each other. It should be noted that "pipeline" refers to a gas passage similar to a pipe connection, and is not limited to a pipe; it can also be other forms of gas passage.

[0019] The movement of the piston rod 304 is controlled by the pressure of the gas in the first chamber 60, which in turn drives the top connector 303 to move. Since the top connector 303 and the second arm 302 are fixedly set, the second arm 302 will also move due to the movement of the top connector 303. The first arm 301 can move left and right relative to the connecting box 40, and the second arm 302 can move left and right relative to the connecting box 40. The workpiece 92 to be clamped can be clamped between the first positioning surface 3011 and the second positioning surface 3021.

[0020] 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 92 to be clamped. This positioning is achieved by the movement of the piston rod 304. The forces on the first arm 301 and the second arm 302 to be clamped are relatively balanced, so that when the first arm 301 and the second arm 302 clamp the workpiece 92, especially when the workpiece 92 is a hollow structure, the first arm 301 and the second arm 302 can effectively maintain the integrity of the shape of the workpiece 92 to be clamped.

[0021] 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.

[0022] The top connector can be in the form of a plate, a rod, or other structures.

[0023] 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.

[0024] The term "sliding connection" refers to a connection where one component can slide relative to another, and the two components can be connected together.

[0025] The terms "first positioning surface 3011" and "second positioning surface 3021" refer to the surfaces on the fixture 30 used for positioning the workpiece 92 to be clamped.

[0026] 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.

[0027] 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.

[0028] The clamp 30 has an air source, which is connected to the first air supply line 307 and the second air supply line 309. The gas pressure in the first air supply line 307 and the second air supply line 309 is the same.

[0029] The first gas supply line 307 is located on the first support arm 301, and the second gas supply line 309 is located on the first support arm 301. The first gas supply line 307 and the second gas supply line 309 are connected.

[0030] A first air supply line 307 and a second air supply line 309 are provided inside the first support arm 301, and the second air supply line 309 and the first air supply line 307 come from the same air source. In this way, the gas pressure in the first air supply line 307 and the second 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 92 to be clamped, which is beneficial to the uniform force on the workpiece 92 to be clamped.

[0031] The clamping mechanism has a first working point and a second working point. When the clamping mechanism is at the first working point, gas with a certain pressure is input into the first air supply line 307 and the second air supply line 309. The pressure in the first chamber 60 increases, causing the piston rod 304 to move relative to the connecting 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 connecting box 40, and the second positioning surface 3021 of the second support arm 302 abuts against the workpiece 92 to be clamped. The pressure in the second 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 workpiece 92 to be clamped. When the clamping mechanism is at the second working point, air is drawn from or vented from the first air supply line 307 and the second air supply line 309. The pressure in the first chamber 60 decreases, causing the piston rod 304 to move relative to the connecting 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. The pressure in the second chamber 313 decreases, 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 92 to be clamped.

[0032] In this article, the terms "first working point," "second working point," etc., do not have a sequential relationship. They are used to describe different situations, and the second working point can also occur before the first working point. Similarly, the sequential words "first" and "second" used in this article are for better distinguishing the structure and are not used as sequential terms.

[0033] The connecting box 40 has a first hole 401 facing the piston rod 304. A portion of the piston rod 304 is located in the first hole 401. The first peripheral wall 3041 of the piston rod 304 is sealed to the side wall corresponding to the first hole 401 of the connecting box 40. A space is left between the first end 3042 of the piston rod 304 and the bottom wall corresponding to the first hole 401. This space is defined as the first chamber 60. When the gas pressure in the first chamber 60 changes, the size of the first chamber 60 can be changed.

[0034] The piston rod 304 has an internal channel 3043, which is connected to the first chamber 60 and the first air supply line 307.

[0035] An internal channel 3043 is provided inside the piston rod 304. The internal channel 3043 is used to connect the first chamber 60 and the first air supply line 307. The air passage is arranged inside, making the structure more compact.

[0036] As another implementation method, refer to Figure 11 The first arm is fixed to the top connector with a pin. The piston rod and the first arm can also be fixed by means of threaded connection or interference fit, or limited in the length direction of the piston rod.

[0037] The top connector 303 is located above the connecting box 40. The top of the first arm 301 is fixed to the top connector 303, and the top of the second arm 302 is fixed to the top connector 303.

[0038] The clamp 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.

[0039] 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.

[0040] The clamp 30 has an elastic element 311, and the connecting box 40 has a second hole 402 facing the second support arm 302. A part of the connecting rod 305 is located in the second hole 402. The elastic element 311 is sleeved on the part of the connecting rod 305. The elastic element 311 is located in the second hole 402. One end of the elastic element 311 is fixed or limited to the wall corresponding to the second hole 402 of the connecting box 40, and the other end of the elastic element 311 is fixed or limited to the second support arm 302. The connecting rod 305 can move relative to the connecting box 40.

[0041] The connecting rod 305 is connected to the connecting box 40 by an elastic element 311. When the top connecting member 303 moves towards the connecting 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 connecting box 40, the elastic element 311 exerts a certain rebound force on the second arm 302. Thus, the second arm 302 will release the workpiece 92 to be clamped.

[0042] The top of the connecting box 40 has a protrusion 406, and the top connector 303 has a groove 3031. The protrusion 406 is located in the groove 3031. With the extension direction of 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.

[0043] The drive rod 310 has a sealing head 3102 and a rod body 3103. The sealing head 3102 is limitedly connected to the rod body 3103. The 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 clamped. The first positioning surface 3011 may be located on the sealing element 3121.

[0044] The first arm has a third 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 third connecting hole 3013. A space is left between the second end 3104 of the drive rod 310 and the bottom wall corresponding to the third connecting hole 3013. This space is defined as the second chamber 313. The drive rod 310 is slidably connected to the first arm 301. The drive rod 310 can move under the gas pressure in the second chamber 313.

[0045] 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.

[0046] The fixture 30 has a plug 312, the first arm 301 has a first connecting hole 3014, the piston rod 304 extends into the first connecting hole 3014, the plug 312 abuts against the piston rod 304, and the plug 312 is fixedly set with the first arm 301. During processing, the first arm 301 is first processed to form a second connecting hole 3022, and the piston rod 304 is extended into the second connecting hole 3022. One end of the piston rod 304 leaves a space between itself and the wall inside the connecting box 40 and the corresponding part at the bottom of the piston rod 304, and 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 arm 301 is convenient and the processing is simple.

[0047] The second arm 302 has a second connecting hole 3022, a portion of the connecting rod 305 extends into the second 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 second connecting hole 3022, and the connecting rod 305 and the second arm 302 are positioned in a limiting manner.

[0048] 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.

[0049] The clamp 30 has a push rod 502 and a sealing head 503 fixed or limited to the push rod 502. The push rod 502 and the connecting box 40 are slidably connected.

[0050] The clamp 30 has a third chamber 70, a fourth chamber 80, a third air supply line 403 and a fourth air supply line 404. The third air supply line 403 is connected to the third chamber 70, the fourth air supply line 404 is connected to the fourth chamber 80, and the third chamber 70 and the fourth chamber 80 are not connected.

[0051] The fixture 30 has a third working point and a fourth working point. At the third working point, the pressure in the third chamber 70 is greater than the pressure in the fourth chamber 80, and the gas in the third chamber 70 pushes the push rod 502 downward. At the fourth working point, the pressure in the fourth chamber 80 is greater than the pressure in the third chamber 70, and the gas in the fourth chamber 80 pushes the push rod 502 upward.

[0052] The positioning rod 50 may also have a third positioning surface 501, which can be used for positioning the workpiece 92 to be clamped in the vertical direction.

[0053] The positioning rod 50 is equipped with a sealing head structure, which can partially extend into the hole of the workpiece 92 to be clamped, or seal the hole of the workpiece 92 on the surface of the workpiece 92 to be clamped. When the workpiece 92 is filled with gas of a certain pressure for testing the sealing performance, the positioning rod is sealed by the gas pressure in the connecting box 40. This allows the positioning rod to be subjected to the pressure of the gas in the workpiece 92 to be clamped and the gas pressure in the connecting box 40. The pressure can be balanced to a certain extent, so that the positioning force of the clamp 30 on the workpiece 92 to be clamped is less likely to damage the shape of the workpiece 92.

[0054] 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 clamp, comprising a first arm and a second arm, characterized in that, The clamp has a top connector, a connecting box, a piston rod, a connecting rod, and a drive rod. The connecting box is at least partially located between the first support arm and the second support arm. A portion of the piston rod is located inside the first support arm. The piston rod is fixed to the first support arm or the piston rod and the first support arm are limited in the length direction of the piston rod. A portion of the piston rod is located inside the connecting box. The first support arm and the second support arm are driven by the top connector. The clamp has a first air supply line and a second air supply line. The clamp has a first chamber. The first air supply line communicates with the first chamber. The piston rod is slidably connected to the connecting box. The piston rod can be subjected to... The gas pressure in the first chamber moves, causing the first support arm to move the top connector. The clamp has a second chamber, and the second air supply line communicates with the second chamber. A portion of the drive rod is located inside the first support arm, and the drive rod is slidably connected to the first support arm. The drive rod can move under the gas pressure in the second chamber. The drive rod has a first positioning surface, and the second support arm has a second positioning surface. The first positioning surface is opposite to one side of the workpiece to be clamped, and the second positioning surface is opposite to the other side of the workpiece to be clamped. The first air supply line is located in the first support arm, and the second air supply line is located in the first support arm. The first positioning surface and the second positioning surface are arranged opposite to each other. The fixture has a first working point and a second working point. When the fixture is at the first working point, gas with a certain pressure is input into the first and second air supply lines, increasing the pressure in the first chamber. This causes the piston rod to move relative to the connecting box, and the piston rod drives the first support arm and the top connecting piece to move in a direction relatively away from the second support arm, causing the second support arm to abut against the connecting box, and the second positioning surface of the second support arm to abut against the workpiece to be inspected. The pressure in the second chamber increases, driving the drive rod to move towards the second support arm, and the first positioning surface abuts against the workpiece to be inspected. When the fixture is at the second working point, air is drawn from the first and second air supply lines, reducing the pressure in the first chamber. This causes the piston rod to move relative to the connecting box. The first arm and the top connector drive the piston rod to move toward the second arm, while the second arm moves away from the first arm. This further reduces the pressure in the second chamber, causing the drive rod to move away from the second arm. The first and second positioning surfaces then disengage from the workpiece to be inspected.

2. The clamp according to claim 1, characterized in that: The clamp has an air source, which is connected to the first air supply line and the second air supply line. The gas pressure in the first air supply line and the second air supply line is the same. The first gas supply pipeline and the second gas supply pipeline are connected.

3. The clamp according to claim 1, characterized in that: The connecting box has a first hole facing the piston rod. A portion of the piston rod is located in the first hole. A space is left between the first end of the piston rod and the bottom wall corresponding to the first hole. This space is defined as the first chamber. The first peripheral wall of the piston rod is sealed to the side wall corresponding to the first hole of the connecting box. When the gas pressure in the first chamber changes, the size of the first chamber can be changed. The piston rod has an internal channel that communicates with the first chamber and the first air supply line.

4. The clamp according to claim 1, characterized in that: The top connector is located above the connecting box, the top of the first arm is fixed to the top connector, and the top of the second arm is fixed to the top connector; The clamp 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.

5. The clamp according to claim 1, characterized in that: The clamp has an elastic element, the connecting box has a second hole facing the second support arm, a portion of the connecting rod is located in the second hole, the elastic element is sleeved on the portion of the connecting rod, the elastic element is located in the second hole, one end of the elastic element is fixed or limited to the wall corresponding to the second hole of the connecting 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 connecting box.

6. The clamp according to claim 1, characterized in that: The top of the connecting 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, and the protrusion can move within the groove.

7. The clamp according to claim 1, characterized in that: The drive rod has a sealing head and a rod body. The sealing head is connected to the rod body for limiting. The 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 clamped. The first positioning surface is located on the sealing element.

8. The clamp according to claim 1, characterized in that: The clamp has a plug, the first arm has a first connecting hole, the piston rod extends into the first connecting hole, the plug abuts against the piston rod, and the plug is fixedly disposed with the first arm; The second arm has a second connecting hole, a portion of the connecting rod extends into the second connecting hole, the connecting rod has a flange portion, the outer diameter of the flange portion is larger than the diameter of the second connecting hole, and the connecting rod is positioned to limit the second arm.

9. The clamp according to claim 1, characterized in that, The clamp has a push rod and a sealing head that is fixed or limited to the push rod, and the push rod and the connecting box are slidably connected. The clamp has a third chamber, a fourth chamber, a third air supply line, and a fourth air supply line. The third air supply line is connected to the third chamber, the fourth air supply line is connected to the fourth chamber, and the third chamber and the fourth chamber are not connected. The clamp has a third working point and a fourth working point. At the third working point, the pressure in the third chamber is greater than the pressure in the fourth chamber, and the gas in the third chamber pushes the push rod downward. At the fourth working point, the pressure in the fourth chamber is greater than the pressure in the third chamber, and the gas in the fourth chamber pushes the push rod upward.

Images