Pneumatic expanding positioning pin

Abstract

According to the scheme, the pneumatic expanding positioning pin is provided with a base provided with an inflation and deflation channel and a supporting base used for supporting a workpiece with a hole, the pneumatic expanding positioning pin further comprises a shell, the shell is provided with a fixing hole and a through hole, a positioning shaft used for being inserted into the workpiece is arranged at the top of the shell, and a plurality of positioning holes are formed in the side face of the positioning shaft; one end of the piston is arranged in the through hole of the shell, the other end of the piston is located outside the shell, and the piston can move back and forth in the length direction of the through hole under the action of air pressure; and the balls are arranged in the positioning holes, and at least part of each ball can stretch out of the corresponding positioning hole under extrusion of the piston so as to position and clamp the workpiece with the hole. The device has the advantages of being simple in structure, stable and reliable.

Description

Technical Field

[0001] The present application relates to a positioning tool, in particular to a pneumatic expanding diameter positioning pin. Background Art

[0002] The enlarged diameter positioning pin is a common positioning tool and is widely used in the mechanical field. At present, a diameter enlarged positioning pin disclosed in CN210978119U includes a positioning pin body, a piston, a tension sleeve, a pressure piece and a spring. The tension sleeve can be elastically deformed, and the piston is slidably arranged in the positioning pin body in the vertical direction. The spring drives the piston downward, and the tension sleeve is arranged on the positioning pin body. The pressure piece is fixedly connected to the piston, and the upper end of the pressure piece extends outside the positioning pin body. The pressure piece is provided with a first contact surface that can contact the upper end surface of the tension sleeve, and the positioning pin body is provided with a second contact surface that can contact the lower end surface of the tension sleeve. The piston is driven downward by the spring, which can drive the pressure piece to move downward synchronously so that the first contact surface moves toward the side close to the second contact surface, and the tension sleeve is squeezed by the first contact surface and the second contact surface to realize radial expansion. The piston drives the pressure piece upward synchronously so that the first contact surface moves toward the side away from the second contact surface, and the tension sleeve is reset. However, the service life of the tension sleeve and the spring of this structure is not very long, and they are prone to aging with time of use. In particular, the tension sleeve relies on elastic deformation to be fixed in the workpiece hole. Long-term use will easily age and cause its elasticity to deteriorate, and it can no longer fix the workpiece.

[0003] Therefore, there is an urgent need for a pneumatic enlarging locating pin with a simple structure, long service life, stability and reliability to solve the problems existing in the prior art. Utility Model Content

[0004] The purpose of this application is to provide a pneumatic expansion positioning pin to address the above-mentioned problems existing in the prior art.

[0005] In order to achieve the above application purpose, the present application adopts the following technical solution: the pneumatic expansion positioning pin includes a base provided with an air charging and discharging channel and a support seat for supporting a workpiece with a hole, and also includes:

[0006] The housing is provided with a fixing hole and a through hole, and a positioning shaft for inserting a workpiece is provided on the top of the housing, and a plurality of positioning holes are provided on the side of the positioning shaft;

[0007] A piston, one end of which is disposed in the through hole of the housing and the other end of which is located outside the housing, and which can move back and forth along the length direction of the through hole under the action of gas pressure;

[0008] A ball is arranged in each positioning hole, and each ball can at least partially extend out of the positioning hole under the extrusion of the piston to position and clamp the workpiece with a hole.

[0009] Working principle and beneficial effects: Compared with the prior art, when the present application is used, the shell is first installed on the base (substrate) through the fixing hole, the top of the shell is inserted into the hole for positioning the workpiece, the bottom of the shell is inserted into the charging and discharging channel of the base, the support seat is placed between the base and the workpiece with holes, and then the charging and discharging channel is inflated, so that the piston rises under the action of air pressure, and the piston squeezes the ball so that the ball part extends out of the positioning hole, thereby positioning and clamping the workpiece with holes. At this time, the piston will block the degassing channel, and the workpiece can be fixed uniformly by maintaining the air pressure. When the workpiece needs to be released, the air pressure is released and the air pressure of the degassing channel is opened. At this time, the piston will slide down, and the ball loses its clamping effect on the workpiece due to the lack of squeezing force. At this time, the workpiece can be taken out freely. In this way, there is no need to rely on the existing springs and tension sleeves. The use of steel balls and air pressure can have a longer service life, and the structure is simpler, which is suitable for scenes requiring higher clamping force.

[0010] Furthermore, a limiting section is provided on the inner wall of the through hole, and a pin is provided on the piston, and the limiting section cooperates with the pin to limit the stroke of the piston. In this way, the stroke of the piston can be limited to prevent the piston from rising excessively, causing the ball to be squeezed out of the positioning hole, or causing damage to the positioning hole.

[0011] Furthermore, when the pin is at the bottom of the limit section, the top of the piston is lower than the highest point of each ball and higher than the lowest point of each ball. In this way, it can be ensured that when the piston is at the maximum stroke (the piston extends out of the housing to the maximum), the ball will not roll to the top of the piston, that is, it will not fall out of the positioning hole, and the ball will be kept at least partially in the positioning hole.

[0012] Furthermore, a guide portion is provided on the top of the piston, and when the piston moves upward along the through hole under the action of air pressure, each ball can roll along the guide portion and be squeezed to move out of the positioning hole. This arrangement can smoothly guide the movement of the ball and reduce the occurrence of jamming.

[0013] Furthermore, each ball is always in contact with the guide portion, thus ensuring that the ball is always in a restricted state and will not fall out of the positioning hole.

[0014] Furthermore, a connecting hole is provided at the bottom of the piston, so that the piston can be connected to other driving parts, and no longer constrained by the charging and discharging passage of the base, such as an electric push rod, etc., which can also realize the back and forth movement of the piston.

[0015] Furthermore, the part of the piston outside the housing and the outer wall of the housing are both provided with sealing rings, so as to better cooperate with the charging and discharging passage of the base and reduce the occurrence of air leakage.

[0016] Furthermore, the positioning hole includes an outer hole with a diameter smaller than that of the ball and an inner hole with a diameter greater than or equal to that of the ball. In this way, it can be ensured that the ball will not easily fall out of the positioning hole. Preferably, the positioning hole can also be slightly tilted inward, such as 1-5 degrees, so that when the piston falls, the ball can automatically slide into the through hole to achieve the resetting of the ball.

[0017] Furthermore, a sealing ring is also provided between the piston and the inner wall of the through hole, so as to ensure that the gas in the gas charging and discharging passage will not enter the through hole.

[0018] Further, the shell side is provided with an air jet cleaning hole communicated with the through hole. In this way, the through hole can be cleaned with the air jet cleaning hole to maintain the smoothness of the movement of the piston. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of this application;

[0020] Figure 2 is a stereogram of the present application;

[0021] Figure 3 It is a schematic diagram of the deflated state of this application;

[0022] Figure 4 It is a schematic diagram of the inflated state of this application.

[0023] In the figure, 1, base; 2, support seat; 3, workpiece; 4, shell; 5, piston; 6, ball; 7, cover sleeve; 11, deflation channel; 12, inflation channel; 13, jet cleaning channel; 41, positioning shaft; 42, positioning hole; 43, jet cleaning hole; 44, limiting section; 51, guide part; 52, pin shaft; 53, connecting hole. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0025] Those skilled in the art should understand that, in the disclosure of the present application, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be understood as limiting the present application.

[0026] like Figure 1-4 As shown, the pneumatic expansion positioning pin includes a base 1 provided with an air charging and discharging channel 11 and a support seat 2 for supporting a workpiece 3 with a hole. In this embodiment, the base 1 and the support seat 2 are used as the prior art, wherein the air charging and discharging channel 11 of the base 1 (including the deflation channel 11 providing the air pressure for release and the inflation channel 12 connected to the deflation channel 11 to provide the air pressure for positioning) is used for inflation and deflation, and a jet cleaning channel 13 can also be provided, which belongs to conventional technical means and will not be repeated here. The support seat 2 is a more common support structure, which also belongs to conventional technical means and will not be repeated here.

[0027] This application also includes:

[0028] The housing 4 is provided with a fixing hole and a through hole, and a positioning shaft 41 for inserting the workpiece 3 is provided on the top of the housing 4, and a plurality of positioning holes 42 are provided on the side of the positioning shaft 41;

[0029] In this embodiment, the fixing hole is used to fix on the base 1 by bolts, etc., so that the housing 4 is inserted into the gas charging and discharging passage 11 of the base 1. Preferably, the side of the housing 4 is provided with a jet cleaning hole 43 connected with the through hole, and the jet cleaning hole 43 is connected with the jet cleaning passage 13 on the base 1. The portion of the housing 4 in the gas charging and discharging passage 11 is provided with a sealing ring.

[0030] The number of the positioning holes 42 may be two or three or more, depending on the size of the positioning shaft 41 . The positioning holes 42 are evenly spaced on the positioning shaft 41 along the circumferential direction of the positioning shaft 41 .

[0031] The piston 5 has one end disposed in the through hole of the housing 4 and the other end outside the housing 4 and can move back and forth along the length direction of the through hole under the action of air pressure; a sealing ring is also provided between the piston 5 and the inner wall of the through hole and at the part of the piston 5 outside the housing 4.

[0032] In this embodiment, a guide portion 51 is provided on the top of the piston 5. When the piston 5 moves upward along the through hole under the action of air pressure, each ball 6 can roll along the guide portion 51 and be squeezed to move out of the positioning hole 42, and each ball 6 is always in contact with the guide portion 51. Preferably, a limit section 44 is provided on the inner wall of the through hole, and a pin 52 is provided on the piston 5. The limit section 44 cooperates with the pin 52 to limit the stroke of the piston 5. The stroke of the piston 5 can be limited to prevent the piston 5 from rising excessively, causing the ball 6 to be squeezed out of the positioning hole 42, or causing the positioning hole 42 to be damaged.

[0033] When the pin 52 is located at the bottom of the limiting section 44, the top of the piston 5 is lower than the highest point of each ball 6 and higher than the lowest point of each ball 6. In this way, it is ensured that when the piston 5 is at the maximum stroke (the maximum stroke of the piston 5 extending out of the housing 4), the ball 6 will not roll to the top of the piston 5, that is, will not fall out of the positioning hole 42, and the ball 6 is kept at least partially in the positioning hole 42.

[0034] Preferably, a connecting hole 53 is provided at the bottom of the piston 5. In this way, the piston 5 can be connected to other driving members, and can be no longer constrained by the charging and discharging passage 11 of the base 1. For example, an electric push rod can also realize the back and forth movement of the piston 5.

[0035] The ball 6 is disposed in each positioning hole 42 , and each ball 6 can at least partially extend out of the positioning hole 42 under the squeezing of the piston 5 to position and clamp the workpiece 3 with a hole.

[0036] In this embodiment, the ball 6 can be made of steel balls, such as stainless steel, carbon steel and other materials. Preferably, the positioning hole 42 includes an outer hole with a diameter smaller than the ball 6 and an inner hole with a diameter greater than or equal to the ball 6. This ensures that the ball 6 will not easily fall out of the positioning hole 42. Preferably, the positioning hole 42 can also be slightly tilted inward, such as 1-5 degrees, so that when the piston 5 falls, the ball 6 can automatically slide into the through hole to achieve the reset of the ball 6.

[0037] In other embodiments, in order to facilitate the assembly between the piston 5 and the shell 4, the shell 4 can also be divided into a shell 4 and a cover sleeve 7, and the top of the cover sleeve 7 and the bottom of the shell 4 form a limiting section 44, so that the pin shaft 52 of the piston 5 can be easily installed into the through hole.

[0038] The parts not described in detail in this application are prior art, so this application does not describe them in detail.

[0039] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0040] Although the present invention uses the terms such as base 1, support base 2, workpiece 3, housing 4, piston 5, ball 6, cover 7, deflation channel 11, inflation channel 12, jet cleaning channel 13, positioning shaft 41, positioning hole 42, jet cleaning hole 43, limiting section 44, guide part 51, pin 52, connecting hole 53, etc. more frequently, the possibility of using other terms is not excluded. The use of these terms is only for the purpose of more conveniently describing and explaining the essence of the present application; interpreting them as any additional restrictions is contrary to the spirit of the present application.

[0041] The present application is not limited to the above-mentioned optimal implementation mode. Anyone can derive other forms of products under the inspiration of the present application. However, no matter what changes are made in the shape or structure, any technical solution that is the same or similar to that of the present application falls within the protection scope of the present application.

Claims

1. A pneumatic expansion positioning pin, used for positioning a workpiece with a hole, comprising a base provided with an air filling and discharging channel and a support seat for supporting the workpiece with a hole, characterized in that: Also includes: The housing is provided with a fixing hole and a through hole, and a positioning shaft for inserting a workpiece is provided on the top of the housing, and a plurality of positioning holes are provided on the side of the positioning shaft; A piston, one end of which is disposed in the through hole of the housing and the other end of which is located outside the housing, and which can move back and forth along the length direction of the through hole under the action of gas pressure; A ball is disposed in each of the positioning holes, and each of the balls can at least partially extend out of the positioning hole under the squeezing of the piston to position and clamp the workpiece with a hole.

2. The pneumatic expansion positioning pin according to claim 1, characterized in that: A limiting section is provided on the inner wall of the through hole, and a pin is provided on the piston, and the travel of the piston is limited by the cooperation between the limiting section and the pin.

3. The pneumatic expansion positioning pin according to claim 2, characterized in that: When the pin is located at the bottom of the limiting section, the top of the piston is lower than the highest point of each of the balls and higher than the lowest point of each of the balls.

4. The pneumatically expanded positioning pin according to claim 1, characterized in that: A guide portion is provided on the top of the piston. When the piston moves upward along the through hole under the action of air pressure, each of the balls can roll along the guide portion and be squeezed to move out of the positioning hole.

5. The pneumatically expanded positioning pin according to claim 4, characterized in that: Each of the balls is always in contact with the guide portion.

6. The pneumatically expanded positioning pin according to claim 1, characterized in that: A connecting hole is provided at the bottom of the piston.

7. The pneumatically expanded positioning pin according to claim 1, characterized in that: The portion of the piston located outside the housing and the outer wall of the housing are both provided with sealing rings.

8. The pneumatically expanded positioning pin according to any one of claims 1 to 7, characterized in that: The positioning hole includes an outer hole with a diameter smaller than that of the ball and an inner hole with a diameter greater than or equal to that of the ball.

9. The pneumatically expanded positioning pin according to any one of claims 1 to 7, characterized in that: A sealing ring is also provided between the piston and the inner wall of the through hole.

10. The pneumatically expanded positioning pin according to any one of claims 1 to 7, characterized in that: The shell side is provided with an air jet cleaning hole communicated with the through hole.

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