Expansion pin air cylinder

Abstract

The utility model discloses an expansion pin air cylinder which comprises a cylinder barrel provided with an inner cavity, a piston assembly installed in the inner cavity of the cylinder barrel, a driving rod connected with the output end of the piston assembly, an elastic inner supporting ring arranged on the top of the cylinder barrel and movably arranged on the driving rod in a sleeved mode, and a plurality of elastic driving pieces arranged between the piston assembly and the top wall of the inner cavity of the cylinder barrel. A wedge-shaped structure is arranged between the contact surfaces of the elastic inner supporting ring and the driving rod; the elastic driving piece is always in a compressed state; when the air cylinder is not ventilated, the elastic driving piece is used for pressing the piston assembly downwards and pulling the driving rod downwards, so that the driving rod abuts against the elastic inner supporting ring through the wedge-shaped structure to be opened. When the air cylinder is ventilated, the piston assembly ascends to release the elastic inner supporting ring to be shrunk and reset, and the elastic driving piece is compressed. In a normal state, the elastic driving piece stretches out to clamp materials, the automatic clamping function can be achieved while the size of the air cylinder is reduced, the requirement for air supply is reduced, large output force is achieved, the efficiency and flexibility of an automatic production line are improved, meanwhile, the occupied space of equipment is reduced, and the production cost is reduced. And the dual requirements of the modern industry on compactness and high performance are met.

Description

TECHNICAL FIELD

[0001] The utility model relates to automatic technology field especially relates to a kind of expansion pin air cylinders. BACKGROUND

[0002] In the field of automated production and manufacturing, material clamping and transportation is a key link. During the machining and assembly process, the cylinder needs to be continuously clamped to ensure the stability of transportation.

[0003] Currently, the existing cylinder type is relatively single, mainly through the control of air intake and air outlet to realize the function of clamping and loosening. During the process of clamping material and transportation, continuous air supply is required to maintain the required clamping force, and the air supply requirement is high. Moreover, the existing cylinder is large in size, which is difficult to apply to occasions with high space requirements. SUMMARY

[0004] The utility model aims to provide a kind of expansion pin air cylinder, rely on elastic driving member to protrude and clamp material under normal state, realize automatic clamping function while reducing the volume of cylinder, reduce the requirement of air supply, have greater output, improve the efficiency and flexibility of automated production line, reduce the equipment occupied space at the same time, meet the dual needs of compactness and high performance of modern industry.

[0005] To achieve the above-mentioned purpose, the following technical solutions are adopted:

[0006] An expansion pin air cylinder, comprising a cylinder barrel provided with an inner cavity, a piston assembly installed in the inner cavity of the cylinder barrel, a drive rod connected to the output end of the piston assembly, an elastic inner support ring provided on the top of the cylinder barrel and movably sleeved on the drive rod, and a plurality of elastic driving elements provided between the piston assembly and the top wall of the inner cavity of the cylinder barrel; a wedge-shaped structure is provided between the contact surface of the elastic inner support ring and the drive rod; the elastic driving elements are always in a compressed state; when the air cylinder is not ventilated, the elastic driving elements are used to press down the piston assembly to pull down the drive rod, so that the drive rod abuts against the elastic inner support ring through the wedge-shaped structure to open; when the air cylinder is ventilated, the piston assembly rises to release the elastic inner support ring to reset and compress the elastic driving elements.

[0007] Preferably, at least one anti-rotation column is provided between the outer side wall of the piston assembly and the inner cavity side wall of the cylinder barrel; and a embedding groove is provided in the outer side wall of the piston assembly corresponding to each anti-rotation column.

[0008] Preferably, the lower part of the cylinder barrel is provided in a cylindrical shape; two sealing rings are sleeved on the outer periphery of the lower part of the cylinder barrel; a plurality of air holes are provided in the cylinder barrel side wall between the two sealing rings, and the air holes are opened through the inner cavity of the cylinder barrel.

[0009] Preferably, the piston assembly comprises a piston, and a piston rod connected to the top of the piston; the driving rod is detachably connected to the top of the piston rod; and the plurality of elastic driving members are arranged in a ring shape on the top of the piston.

[0010] Preferably, the top of the piston is provided with a guide positioning groove corresponding to each elastic driving member.

[0011] Preferably, the wedge-shaped structure comprises a first wedge-shaped surface provided on the upper part of the inner ring of the elastic inner support ring, and a second wedge-shaped surface provided on the outer periphery of the driving rod and matched with the first wedge-shaped surface; the first wedge-shaped surface is formed by gradually reducing the inner ring of the elastic inner support ring from top to bottom.

[0012] Preferably, the side wall of the elastic inner support ring is provided with a split opening so that the elastic inner support ring can be opened.

[0013] Preferably, the bottom of the cylinder barrel is detachably connected with a rear cover.

[0014] With the above scheme, the beneficial effects of the utility model are:

[0015] The expansion pin air cylinder provided by the utility model is a single-acting air cylinder, and in normal state, the elastic driving members are extended to clamp the materials, the automatic clamping function can be realized while the volume of the air cylinder is reduced, the requirement for air supply is reduced, the output is large, the efficiency and flexibility of the automatic production line are improved, the equipment occupying space is reduced, the dual requirements of compactness and high performance of modern industry are met. In the preferred scheme, the anti-rotation column is arranged to realize self-locking, and the accidental rotation of the piston assembly during the up-down movement can be effectively prevented to cause the material to change direction. At the same time, the lower part of the cylinder barrel is arranged in a cylindrical shape, and two sealing rings are arranged on the outer sleeve of the cylinder barrel, so that the air cylinder can be directly embedded in the jig for use, air supply is not required through the joint, the space required for installation is reduced, and the use is flexible and convenient. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a perspective view of the utility model;

[0017] Figure 2 It is a sectional view of the utility model;

[0018] Figure 3 It is Figure 2 It is a local enlarged view of A in the middle;

[0019] Figure 4 It is an explosion view of the utility model;

[0020] Among them, the drawing mark explanation is:

[0021] 1 - cylinder barrel, 2 - piston assembly,

[0022] 3 - driving rod, 4 - elastic inner support ring,

[0023] 5 - elastic drive, 6 - wedge structure,

[0024] 7 - anti-rotation post, 8 - sealing ring,

[0025] 9 - vent hole, 10 - rear cover,

[0026] 21 - piston, 22 - piston rod. DETAILED DESCRIPTION

[0027] The utility model will be described in further detail below in combination with the drawings and examples. It can be understood that the specific examples described herein are only used to explain the utility model, and not to limit the utility model. In addition, it should be noted that, for the convenience of description, only the parts related to the utility model are shown in the drawings, not all the structures.

[0028] In the utility model, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include the direct contact of the first and second features, or can include the contact of the first and second features through another feature between them. Moreover, the "upper", "upper" and "upper" of the first feature to the second feature include the vertical and oblique above of the first feature to the second feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The "lower", "lower" and "lower" of the first feature to the second feature include the vertical and oblique below of the first feature to the second feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0029] In the description of the present embodiment, the orientation or position relationship of the terms "upper", "lower", "left", "right" and the like is based on the orientation or position relationship shown in the drawings, only for the convenience of description and simplification of operation, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" are only used to distinguish in description, and have no special meaning.

[0030] Reference Figures 1 to 4The utility model provides an expansion pin air cylinder, can solve the end of industrial manipulator clamping and industrial automation equipment, especially in the space requirement is higher's up and down material clamping workplace to the demand of material clamping, ensure the operation precision, effectively solve the space occupation problem, optimize the efficiency and accuracy of material handling, specifically: an expansion pin air cylinder, including the cylinder barrel 1 that is equipped with the inner chamber, install the piston assembly 2 in the inner chamber of cylinder barrel 1, with the output end connection of piston assembly 2 drive rod 3, set up in the top of cylinder barrel 1 and the elastic inner support ring 4 of movable sleeve set in drive rod 3, and set up between the piston assembly 2 and the inner chamber top wall of cylinder barrel 1 a plurality of elastic drive 5, in addition, the bottom of cylinder barrel 1 is detachably connected with rear cover 10.

[0031] Specifically, drive rod 3 is the customized hexagonal screw. The contact surface between elastic inner support ring 4 and drive rod 3 is provided with wedge structure 6; the elastic drive 5 is always in compression state; when the air cylinder is not aerated, the elastic drive 5 is used to press down piston assembly 2 to pull down drive rod 3, so that drive rod 3 abuts against elastic inner support ring 4 through wedge structure 6 to open; when the air cylinder is aerated, piston assembly 2 rises to release elastic inner support ring 4 to reset and compress elastic drive 5.

[0032] Specifically, the elastic drive 5 is a spring. Since the elastic drive 5 is always in compression state, in normal state, the elastic drive 5 is the power source for clamping materials, the elastic force of the elastic drive 5 pushes piston assembly 2 to drop as a whole, so that drive rod 3 presses down elastic inner support ring 4 through wedge structure 6 to expand and open, so as to firmly clamp the materials; when the air pressure pushes piston assembly 2 to rise, elastic inner support ring 4 restores to the original state, thereby releasing the materials. At the same time, the elastic drive 5 is the reset power source, the compressed air pushes piston assembly 2 to move upward, which also compresses the elastic drive 5; when the pressure is released, the elastic drive 5 resets to push piston assembly 2 to restore to the starting point.

[0033] The piston assembly 2 includes piston 21 and piston rod 22 connected to the top of piston 21; the drive rod 3 is detachably connected to the top of piston rod 22; the plurality of elastic drives 5 are annularly and spacedly arranged on the top of piston 21.

[0034] At least one anti-rotation column 7 is arranged between the outer side wall of piston assembly 2 and the inner side wall of cylinder barrel 1; an embedding groove is arranged in the outer side wall of piston assembly 2 corresponding to each anti-rotation column 7. Specifically, the anti-rotation column 7 is arranged as two anti-rotation columns arranged on the opposite outer side walls of piston assembly 2. Further, the anti-rotation column 7 is a pin. The anti-rotation column 7 is installed in the embedding groove of piston assembly 2, which can effectively prevent the rotation of piston rod 22 during the process of taking and placing materials, so as to avoid changing the orientation of the materials.

[0035] In an embodiment, the cylinder 1 has a cross-section in the shape of a "convex" character, and the inner cavity of the cylinder 1 also has a cross-section in the shape of a "convex" character, and the piston rod 22 is arranged in the convex part of the "convex" inner cavity of the cylinder 1. The anti-rotation column 7 is arranged between the outer side wall of the piston rod 22 and the side wall of the convex part of the "convex" inner cavity of the cylinder 1.

[0036] The lower part of the cylinder 1 is in the shape of a cylinder, and two sealing rings 8 are arranged on the outer periphery of the lower part of the cylinder 1. A plurality of air holes 9 are arranged on the side wall of the cylinder 1 between the two sealing rings 8, and the air holes 9 are arranged to pass through the inner cavity of the cylinder 1. By arranging two sealing rings 8 on the outer periphery of the cylinder 1, when the air cylinder is embedded in the jig, a closed space is formed between the two sealing rings 8 and the inner wall of the jig. Air can be supplied to the inner cavity of the cylinder 1 through the air holes 9 arranged on the side wall of the cylinder 1, so that the air cylinder can work.

[0037] The top of the piston 21 is provided with a guide positioning groove corresponding to each elastic driving element 5. By arranging the guide positioning groove, the elastic driving element 5 can be conveniently installed and positioned, and the extension and contraction of the elastic driving element 5 can be guided.

[0038] The wedge structure 6 includes a first wedge surface arranged on the upper part of the inner ring of the elastic inner support ring 4, and a second wedge surface arranged on the outer periphery of the driving rod 3 and matched with the first wedge surface. The first wedge surface is formed by gradually reducing the inner ring of the elastic inner support ring 4 from top to bottom. By arranging the first wedge surface and the second wedge surface, when the driving rod 3 is pulled down, the elastic inner support ring 4 is expanded by abutting and supporting. At the same time, since the first wedge surface is formed by gradually reducing the inner ring of the elastic inner support ring 4 from top to bottom, during the pulling-down process, the second wedge surface of the driving rod 3 abuts and limits the first wedge surface, and the bottom of the elastic inner support ring 4 abuts and limits the top of the cylinder 1. When the driving rod 3 rises, the elastic inner support ring 4 is released, and the elastic inner support ring 4 is contracted and reset under the action of elasticity.

[0039] Specifically, the elastic inner support ring 4 is an elastic steel ring. A split opening is arranged on the side wall of the elastic inner support ring 4, i.e. a cross section. The elastic inner support ring 4 is inserted into the clamping hole of the material, and when the elastic inner support ring 4 is expanded, the two sides of the split opening of the elastic inner support ring 4 are separated to achieve clamping of the material. When the elastic inner support ring 4 is contracted and reset, the two sides of the split opening of the elastic inner support ring 4 are close to each other to achieve release of the material.

[0040] The above are only preferred embodiments of the present application, and are not used to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application. Apparently, the above embodiments of the present application are only examples for clearly explaining the present application, and are not used to limit the implementation manner of the present application. For ordinary skilled in the art, various obvious changes, re-adjustment and replacement can be made without departing from the protection scope of the present application. Here, it is not necessary and also impossible to enumerate all the implementation manners. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An expansion pin cylinder, characterized in that, The device includes a cylinder with an inner cavity, a piston assembly mounted inside the cylinder cavity, a drive rod connected to the output end of the piston assembly, an elastic inner support ring located at the top of the cylinder and movably fitted onto the drive rod, and several elastic drive components located between the piston assembly and the top wall of the cylinder cavity. A wedge-shaped structure is provided between the contact surfaces of the elastic inner support ring and the drive rod. The elastic drive components are always in a compressed state. When the cylinder is not vented, the elastic drive components press down on the piston assembly to pull down the drive rod, causing the drive rod to abut against the elastic inner support ring through the wedge-shaped structure and open. When the cylinder is vented, the piston assembly rises to release the elastic inner support ring, causing it to contract and reset, and compressing the elastic drive components.

2. The expansion pin cylinder according to claim 1, characterized in that, At least one anti-rotation post is provided between the outer wall of the piston assembly and the inner wall of the cylinder; an embedding groove is provided on the outer wall of the piston assembly for each anti-rotation post.

3. The expansion pin cylinder according to claim 1, characterized in that, The lower part of the cylinder is cylindrical; two sealing rings are fitted around the outer circumference of the lower part of the cylinder; several vent holes are spaced apart on the side wall of the cylinder between the two sealing rings, and the vent holes extend into the inner cavity of the cylinder.

4. The expansion pin cylinder according to claim 1, characterized in that, The piston assembly includes a piston and a piston rod connected to the top of the piston; the drive rod is detachably connected to the top of the piston rod; and the plurality of elastic drive members are circumferentially spaced at the top of the piston.

5. The expansion pin cylinder according to claim 4, characterized in that, A guide positioning groove is formed on the top of the piston corresponding to each elastic drive element.

6. The expansion pin cylinder according to claim 1, characterized in that, The wedge structure includes a first wedge-shaped surface located on the upper part of the inner ring of the elastic inner support ring, and a second wedge-shaped surface located on the outer circumference of the drive rod and matching the first wedge-shaped surface; the first wedge-shaped surface is formed by the inner ring of the elastic inner support ring gradually decreasing in size from top to bottom.

7. The expansion pin cylinder according to claim 1, characterized in that, The side wall of the elastic inner support ring is provided with a dividing opening so that the elastic inner support ring can open.

8. The expansion pin cylinder according to claim 1, characterized in that, The bottom of the cylinder is detachably connected to a rear cover.

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