Pneumatic self-locking inner supporting device for workpiece

Abstract

The pneumatic self-locking inner supporting device comprises an installation base, an air cylinder assembly, an expansion piece and a pop rivet assembly, the two ends of the installation base are of an opening structure, a limiting groove is formed in the upper portion of the installation base, the expansion piece is arranged in the limiting groove, the air cylinder assembly is arranged below the installation base, and a pop rivet penetrates through the expansion piece to be connected with the air cylinder assembly. A mounting hole is formed in the workpiece, the expansion piece is arranged in the mounting hole, and the air cylinder assembly is used for driving the blind rivet to move downwards to enable the expansion piece to expand to lock the workpiece; when the first inflation hole in the side face of the cylinder body is inflated, the sliding piece of the air cylinder assembly is extruded downwards and drives the pop rivet to move downwards to open the expansion piece so that a workpiece can be fixed, and the spring is arranged between the sliding piece and the expansion piece and can continuously extrude the sliding piece downwards; the phenomenon that in the workpiece transferring process, an external air pump is powered off or a cylinder body leaks air, so that a blind rivet retracts, an expansion piece contracts, and parts slide down can be avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of zero-point positioning, and particularly relates to a pneumatic self-locking inner support device for workpieces. Background Art

[0002] A zero-point positioning device is usually a high-precision device that cooperates with a workpiece through a pull stud to lock, transfer or position the workpiece. The zero-point positioning device usually has locking methods such as pneumatic drive, mechanical drive or hydraulic drive. Among them, the pneumatic drive principle is relatively simple, easy to maintain, and has a low manufacturing cost. When the zero-point positioning device driven by pneumatic drives to transfer the workpiece, if there is a sudden power failure or air leakage, the workpiece will become loose and fall off the pull stud, resulting in damage. Therefore, it is necessary to avoid the problem that the workpiece loosens or falls due to power failure or air leakage during the transfer process of the pneumatic drive zero-point positioning self-locking device. Content of the Utility Model

[0003] The purpose of the utility model is to provide a pneumatic self-locking inner support device for workpieces. An expansion member is arranged above the mounting seat, and a cylinder assembly is arranged below the mounting seat. The expansion member and the cylinder assembly are connected by a pull stud in the mounting seat. When the first air inlet hole on the side of the cylinder body is inflated, the sliding member of the cylinder assembly will be squeezed downward and drive the pull stud to move downward to expand the expansion member so that the workpiece is fixed. A spring is arranged between the sliding member and the expansion member, and the spring can continuously squeeze the sliding member downward, which can prevent the pull stud from retracting and the part from slipping due to power failure of the external air pump or air leakage of the cylinder body during the transfer process of the workpiece.

[0004] The utility model is realized through the following technical solutions:

[0005] A pneumatic self-locking inner support device for workpieces includes a mounting seat, a cylinder assembly, an expansion member and a pull stud assembly. Both ends of the mounting seat are set as open structures. A limiting groove is arranged above the mounting seat, and the expansion member is arranged in the limiting groove. The cylinder assembly is arranged below the mounting seat. The pull stud passes through the expansion member and is connected with the cylinder assembly. An installation hole is arranged on the workpiece, and the expansion member is arranged in the installation hole. The cylinder assembly is used to drive the pull stud to move downward to expand the expansion member and lock the workpiece.

[0006] Further, the cylinder assembly includes a cylinder body and a sliding member. The sliding member includes a sliding part and a connecting part. The sliding part is arranged in the cylinder body and is slidably connected with the cylinder body. The connecting part passes through the top of the cylinder body and protrudes. The pull stud assembly is connected with the connecting part in the mounting seat. The side of the cylinder body is provided with a first air inlet hole and a second air inlet hole at intervals up and down. The first air inlet hole is arranged above the second air inlet hole. Both the first air inlet hole and the second air inlet hole are connected with an external air pump. The diameters of both the first air inlet hole and the second air inlet hole are smaller than the thickness of the sliding part.

[0007] Further, a butting plate and a spring are arranged on the connecting part of the sliding part. The spring is arranged on the butting plate, sleeved on the rivet assembly and connected to the expansion part. The spring is used to drive the sliding part and the rivet assembly to move downward so that the expansion part locks the workpiece.

[0008] Further, the rivet assembly includes a rivet. The rivet includes a head, a rod part and a tail part. The head of the rivet is of an inverted conical structure. The rod part is arranged between the head and the tail part. The diameter of the tail part is smaller than that of the rod part. Threads are arranged on the tail part, and the tail part is threadedly connected to the sliding part. The head and the rod part of the rivet are arranged in the expansion part.

[0009] Further, a limiting ring is arranged on the rivet. The limiting ring is arranged on the tail part and is used to prevent the rivet from being screwed into the sliding part excessively.

[0010] Further, the expansion part includes a fixed part and an expansion part. The expansion part is connected to the fixed part. The expansion part is of a split structure, and an elastic gap is arranged on the expansion part. A jack is arranged on the expansion part, and the rivet passes through the jack.

[0011] Further, the upper end of the jack on the expansion part is matched with the head of the rivet, and the lower end of the jack is matched with the rod part of the rivet.

[0012] Further, a groove is arranged at the bottom of the elastic gap inside the expansion part, and an elastic groove is arranged at the end of the groove on the outer surface of the expansion part.

[0013] Compared with the prior art, the present utility model has the following advantages and beneficial effects:

[0014] In the present utility model, an expansion part is arranged above the mounting seat, and a cylinder assembly is arranged below the mounting seat. The expansion part and the cylinder assembly are connected by a rivet in the mounting seat. When the first air inlet hole on the side of the cylinder body is inflated, the sliding part of the cylinder assembly will be squeezed downward and drive the rivet to move downward to expand the expansion part so that the workpiece is fixed. A spring is arranged between the sliding part and the expansion part, and the spring can continuously squeeze the sliding part downward, which can prevent the external air pump from powering off or the cylinder body from leaking air during the transfer of the workpiece, resulting in the retraction of the rivet, and thus the expansion part shrinks and the parts slide off. Description of the Drawings

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings in the embodiments. It should be understood that the following drawings only show some embodiments of the present utility model, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0016] Figure 1 This is the front view of the pneumatic self-locking internal support device for the workpiece in the present utility model.

[0017] Figure 2 It is Figure 1 the sectional view taken along the A-A direction of

[0018] Figure 3 This is the structural schematic diagram of the expansion member in the present utility model.

[0019] Wherein: 1 - mounting base, 2 - cylinder block, 21 - first inflation hole, 22 - second inflation hole, 3 - sliding member, 31 - sliding part, 32 - connecting part, 33 - abutting plate, 4 - spring, 5 - pull stud, 51 - head, 52 - rod part, 53 - tail part, 54 - limiting ring, 6 - expansion member, 61 - expansion part, 611 - elastic gap, 612 - groove, 613 - elastic groove, 62 - fixing part, 7 - workpiece, 71 - mounting hole. Specific embodiments

[0020] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some but not all of the embodiments of the present utility model.

[0021] Embodiment 1:

[0022] The main structure of this embodiment is a pneumatic self-locking internal support device for a workpiece, as shown in Figure 1 and Figure 2As shown in the figure, it includes a mounting base 1, a cylinder assembly, an expansion member 6, and a rivet assembly. Both ends of the mounting base 1 are set as open structures. A limiting groove is provided above the mounting base 1, and the limiting groove is set at the opening position at the top of the mounting base 1. The expansion member 6 is arranged in the limiting groove. The cylinder assembly is arranged below the mounting base 1 and is inserted into the interior of the mounting base 1 through the bottom opening of the mounting base 1. The rivet 5 passes through the expansion member 6 and is connected to the cylinder assembly. An installation hole 71 is provided on the workpiece 7, and the expansion member 6 is arranged in the installation hole 71. The cylinder assembly drives the rivet 5 to move downward to expand the expansion member 6 to lock the workpiece 7. The cylinder assembly includes a cylinder body 2 and a sliding member 3. The sliding member 3 includes a sliding part 31 and a connecting part 32. The top of the cylinder body 2 is provided with an opening, and the interior of the cylinder body 2 is a cavity structure. The sliding part 31 is arranged in the cylinder body 2 and is slidably connected to the inner wall of the cylinder body 2. The connecting part 32 passes through the opening at the top of the cylinder body 2 and protrudes. An installation groove is provided on the connecting part 32. The rivet assembly is inserted into the installation groove of the connecting part 32 in the mounting base 1 and is connected to the connecting part 32. First inflation holes 21 and second inflation holes 22 are provided at intervals up and down on the side of the cylinder body 2. The first inflation holes 21 are arranged above the second inflation holes 22. Both the first inflation holes 21 and the second inflation holes 22 are connected to an external air pump. The diameters of both the first inflation holes 21 and the second inflation holes 22 are smaller than the thickness of the sliding part 31. When the first inflation holes 21 are inflated, the sliding member 3 is extruded downward by the gas, causing the rivet 5 to move downward, expanding the expansion member 6, and locking the workpiece 7 with the expansion member 6. When the second inflation holes 22 are inflated, the sliding member 3 moves upward, causing the rivet 5 to move upward and the expansion member 6 to close, so that the workpiece 7 can be removed. A contact plate 33 and a spring 4 are provided on the connecting part 32 of the sliding member 3. The spring 4 is arranged on the contact plate 33. The spring 4 is sleeved on the rivet assembly and is connected to the expansion member 6. The spring 4 is used to drive the sliding member 3 and the rivet assembly to move downward to lock the workpiece 7 with the expansion member 6. When the expansion member 6 transfers the workpiece 7, the first inflation holes 21 are inflated to make the sliding member 3 move downward to drive the rivet 5 to move downward. At this time, the spring 4 plays an auxiliary locking role. The spring 4 presses the rivet 5 downward to keep the rivet 5 stable and prevent the workpiece 7 from loosening or falling due to the upward movement of the rivet 5 after power failure or air leakage.

[0023] Embodiment 2:

[0024] Based on the above embodiment, this embodiment further defines the rivet assembly, such as Figure 2As shown in the figure, the rivet assembly includes a rivet 5, which includes a head 51, a rod portion 52, and a tail portion 53. The head 51 of the rivet 5 has an inverted conical structure. An internal hexagonal hole is provided at the geometric center position of the head 51 of the rivet 5, and the rivet 5 can be rotated with an internal hexagonal wrench. The rod portion 52 is arranged between the head 51 and the tail portion 53. The diameter of the tail portion 53 is smaller than that of the rod portion 52, and a thread is provided on the tail portion 53. The tail portion 53 is threadedly connected to the installation groove of the sliding member 3. The head 51 and the rod portion 52 of the rivet 5 are arranged in the expansion member 6. The diameter of the head 51 is larger than that of the rod portion, and the expansion member 6 can be expanded and locked to the workpiece 7 during the downward sliding process. A limit ring 54 is provided on the rivet 5. The limit ring 54 is arranged on the tail portion 53 and is used to prevent the rivet 5 from being screwed in excessively on the sliding member 3, resulting in thread slipping or damage to the cylinder assembly. Other parts of this embodiment are the same as those of the above embodiment and will not be described in detail here. Embodiment 3:

[0025] Based on the above embodiment, this embodiment further defines the expansion member 6. As Figure 2 and Figure 3 shown, the expansion member 6 includes a fixed portion 62 and an expansion portion 61. The expansion portion 61 is connected to the fixed portion 62. The expansion portion 61 has a split structure, and four elastic gaps 611 are provided on the expansion portion 61. The four elastic gaps 611 divide the expansion portion 61 into four equal parts on average. A jack is provided on the expansion member 6, and the rivet 5 is arranged through the jack. The upper end of the jack on the expansion member 6 is matched with the head 51 of the rivet 5 and is in a funnel-shaped structure. The lower end of the jack is matched with the rod portion 52 of the rivet 5. A groove 612 is provided at the bottom of the elastic gap 611 inside the expansion member 6. The end of the groove 612 is provided with an elastic groove 613 on the outer surface of the expansion member 6. The elastic groove 613 is arranged between the fixed portion 62 and the expansion portion 61. The groove 612 runs through the jack and the elastic groove 613. The cooperation of the groove 612 and the elastic groove 613 makes the expansion portion 61 of the expansion member 6 have elasticity and can prevent the expansion portion 61 from breaking away from the fixed portion 62 during expansion. Other parts of this embodiment are the same as those of the above embodiment and will not be described in detail here.

[0026] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present invention is usually placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0027] In addition, in the description of the present utility model, terms such as "horizontal" and "vertical" do not mean that the components are required to be absolutely horizontal or hanging vertically, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0028] In the description of the present utility model, it should also be noted that unless otherwise clearly specified and limited, if the terms "set", "installed", "connected", "connected" are used, they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0029] The above are only the preferred embodiments of the present utility model, and do not impose any formal restrictions on the present utility model. Any simple modifications and equivalent changes made to the above embodiments based on the technical essence of the present utility model all fall within the protection scope of the present utility model.

Claims

1. A pneumatic self-locking internal support device for a workpiece, characterized in that It includes a mounting base, a cylinder assembly, an expansion member and a rivet assembly. Both ends of the mounting base are provided with an open structure. A limiting groove is provided above the mounting base. The expansion member is arranged in the limiting groove. The cylinder assembly is arranged below the mounting base. The rivet passes through the expansion member and is connected to the cylinder assembly. An installation hole is provided on the workpiece. The expansion member is arranged in the installation hole. The cylinder assembly is used to drive the rivet to move downward to expand the expansion member and lock the workpiece.

2. The pneumatic self-locking inner support device for the workpiece according to claim 1, characterized in that, The cylinder assembly includes a cylinder body and a sliding member. The sliding member includes a sliding part and a connecting part. The sliding part is arranged in the cylinder body and is slidably connected to the cylinder body. The connecting part passes through the top of the cylinder body and protrudes. The rivet assembly is connected to the connecting part in the mounting base. First and second inflation holes are provided at intervals up and down on the side of the cylinder body. The first inflation hole is arranged above the second inflation hole. Both the first inflation hole and the second inflation hole are connected to an external air pump. The diameters of the first inflation hole and the second inflation hole are both smaller than the thickness of the sliding part.

3. The pneumatic self-locking internal support device for the workpiece according to claim 2, characterized in that, A contact plate and a spring are arranged on the connecting part of the sliding member. The spring is arranged on the contact plate. The spring is sleeved on the rivet assembly and is connected to the expansion member. The spring is used to drive the sliding member and the rivet assembly to move downward to lock the workpiece with the expansion member.

4. The pneumatic self-locking internal support device for the workpiece according to claim 3, wherein, The rivet assembly includes a rivet. The rivet includes a head, a rod part and a tail part. The head of the rivet is of an inverted conical structure. The rod part is arranged between the head and the tail part. The diameter of the tail part is smaller than that of the rod part. Threads are provided on the tail part. The tail part is threadedly connected to the sliding member. The head and the rod part of the rivet are arranged in the expansion member.

5. The pneumatic self-locking inner support device for the workpiece according to claim 4, characterized in that, A limiting ring is arranged on the rivet. The limiting ring is arranged on the tail part. The limiting ring is used to prevent the rivet from being screwed in excessively on the sliding member.

6. The pneumatic self-locking internal support device for the workpiece according to claim 4, characterized in that, The expansion member includes an expansion member. The expansion member includes a fixed part and an expansion part. The expansion part is connected to the fixed part. The expansion part is of a split structure. An elastic gap is provided on the expansion part. A jack is provided on the expansion member. The rivet passes through the jack.

7. The pneumatic self-locking internal support device for the workpiece according to claim 6, characterized in that, The upper end of the jack on the expansion member is matched with the head of the rivet, and the lower end of the jack is matched with the rod part of the rivet.

8. The pneumatic self-locking inner support device for the workpiece according to claim 6, characterized in that, A groove is provided at the bottom of the elastic gap inside the expansion member. An elastic groove is provided at the end of the groove on the outer surface of the expansion member.

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