Diaphragm air cylinder with positioning function

Abstract

The utility model relates to the technical field of chip production, and aims to solve the technical problem that the service life is shortened. In order to solve the technical problem, the utility model provides the diaphragm cylinder with the positioning function. A lower cover is provided with a groove body and a vent hole from top to bottom, and the groove body is communicated with the vent hole; the upper cover is connected to the top of the lower cover, a mounting groove and a sliding groove are formed in the bottom of the upper cover from bottom to top, and the mounting groove communicates with the sliding groove; the top wall of the mounting groove is sunken upwards to form a first groove hole, and a positioning pin is mounted in the first groove hole; the positioning pin is provided with a lower half part extending into the mounting groove, and the lower half part comprises a linear section and a conical section from top to bottom; a piston body of the piston is matched with the mounting groove; the guide part is matched with the sliding groove; a positioning pin hole is formed in the top of the piston body, the lower half part is located in the positioning pin hole, and the linear section is matched with the positioning pin hole and used for achieving positioning. And the diaphragm is hermetically connected between the lower cover and the upper cover. According to the utility model, the service life is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of chip manufacturing technology, and in particular to a diaphragm cylinder with positioning function. Background Technology

[0002] Diaphragm cylinders are used in chip packaging and testing for short-stroke pressing of chips. During precision component pressing, the piston of the diaphragm cylinder can only move up and down, but cannot rotate, so positioning of the piston is necessary. Existing diaphragm cylinders use a cylindrical pin with a pin hole for positioning the piston. However, this reliance on the pin for positioning during piston movement leads to severe wear between the piston and the pin, reducing its service life. Utility Model Content

[0003] Therefore, the technical problem to be solved by this utility model is to overcome the above-mentioned problems existing in the prior art.

[0004] To solve the above-mentioned technical problems, this utility model provides a diaphragm cylinder with positioning function, comprising:

[0005] The lower cover has a groove and a vent from top to bottom, and the groove and the vent are connected.

[0006] The top cover is connected to the top of the bottom cover. The bottom of the top cover is provided with a mounting groove and a sliding groove from bottom to top. The mounting groove and the sliding groove are connected to each other. The top wall of the mounting groove is recessed upward to form a first slot hole. A positioning pin is installed in the first slot hole. The positioning pin has a lower half that extends into the mounting groove. The lower half consists of a straight section and a tapered section from top to bottom.

[0007] The piston includes a piston body and a guide portion connected to the top of the piston body. The piston body mates with the mounting groove, and the guide portion mates with the sliding groove. The top of the piston body is provided with a locating pin hole, and the lower half of the piston body is located in the locating pin hole. The straight section mates with the locating pin hole to achieve positioning.

[0008] A diaphragm is used to seal between the lower and upper covers.

[0009] In one embodiment of this utility model, there are two positioning pins and two positioning pin holes, with the positioning pin holes and positioning pins corresponding one-to-one; the two positioning pin holes are symmetrically arranged along the radial direction of the piston.

[0010] In one embodiment of this utility model, the positioning pin is interference-fitted with the first slot; the top of the upper cover is provided with a first through hole, which communicates with the first slot.

[0011] In one embodiment of this utility model, the mating length between the positioning pin and the positioning pin hole is 0.5mm.

[0012] In one embodiment of this utility model, the application further includes a guide pin and a guide pin hole; the top wall of the mounting groove is recessed upward to form a second groove hole, the guide pin is installed in the second groove hole, and the bottom end of the guide pin extends into the mounting groove; the guide pin hole is set on the top of the piston body, and the guide pin hole cooperates with the guide pin; the cooperation clearance between the guide pin hole and the guide pin is greater than the cooperation clearance between the positioning pin and the positioning pin hole.

[0013] In one embodiment of this utility model, the guide pin is interference-fitted with the second slot; the top of the upper cover is provided with a second through hole, which communicates with the second slot.

[0014] In one embodiment of the present invention, at the connection between the upper cover, the lower cover, and the diaphragm, one of the upper cover and the lower cover has an opening on the outer side that communicates with the outside, and the opening has a rounded transition at the position where it contacts the diaphragm.

[0015] In one embodiment of this utility model, the bottom wall of the tank is recessed downward to form a groove, which is located below the diaphragm.

[0016] In one embodiment of the present invention, the piston has a plurality of threaded holes on its top; the piston has a first locating pin protruding from its upper surface on its top.

[0017] In one embodiment of the present invention, the bottom of the lower cover is provided with a plurality of connecting holes; the bottom of the lower cover is provided with a second positioning pin protruding from its lower surface.

[0018] In one embodiment of this utility model, the piston has multiple threaded holes at its top; the piston has a locating pin protruding from its upper surface at its top; the lower cover has multiple connecting holes at its bottom; and the lower cover has a locating pin protruding from its lower surface at its bottom.

[0019] In one embodiment of this utility model, the lower cover and the upper cover are connected by multiple bolts.

[0020] The above-mentioned technical solution of this utility model has the following advantages compared with the prior art:

[0021] The diaphragm cylinder with positioning function described in this utility model divides the bottom of the positioning pin into a straight section and a conical section. During the first stroke, the conical section provides initial positioning and guidance. Then, during the pressing process, the straight section (i.e., the positioning section) engages with the positioning pin hole to achieve final positioning. This ensures that the cylinder piston can disengage from the positioning section more quickly during downward pressure, reducing friction on the positioning pin hole and improving service life. Furthermore, even if the cylinder is not pressed down in a vertical position, the positioning pin and positioning hole will not become stuck, thus avoiding abnormal wear. Attached Figure Description

[0022] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings, wherein:

[0023] Figure 1 This is a schematic diagram of the structure of a diaphragm cylinder with positioning function in a preferred embodiment of the present invention;

[0024] Figure 2 yes Figure 1 A schematic diagram of a diaphragm cylinder with positioning function from another perspective;

[0025] Figure 3 yes Figure 1 A top view of a diaphragm cylinder with positioning function;

[0026] Figure 4 yes Figure 3 BB section view;

[0027] Figure 5 yes Figure 4 Enlarged view of point C;

[0028] Figure 6 yes Figure 3 AA section view;

[0029] Explanation of reference numerals in the accompanying drawings: 100, lower cover; 110, groove; 120, vent hole; 130, sealing groove; 140, sealing ring; 150, recess; 160, connecting hole; 170, second locating pin;

[0030] 200. Top cover; 210. Mounting groove; 220. Slide groove; 211. First slot; 212. Second slot; 230. Positioning pin; 231. Straight section; 232. Tapered section; 240. Guide pin; 250. Second through hole; 260. First through hole;

[0031] 300, Piston; 310, Piston body; 311, Locating pin hole; 312, Guide pin hole; 320, Guide part; 330, Threaded hole; 340, First locating pin;

[0032] 400. Membrane;

[0033] 500, Opening. Detailed Implementation

[0034] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments are not intended to limit the present invention.

[0035] In the comparative embodiment, during the piston's up-and-down movement, the locating pin engages with the locating pin hole. The locating pin is a cylindrical structure. Due to the prolonged engagement between the locating pin and the opening of the locating pin hole (the locating pin is constantly rubbing during the piston's up-and-down movement), the opening of the locating pin hole wears down. Furthermore, if the cylinder does not move vertically up and down, the piston and locating pin may become stuck, leading to even more severe wear.

[0036] To solve the above problems, refer to Figure 1 As shown in Figure 6, this embodiment of the present invention provides a diaphragm cylinder with positioning function, comprising:

[0037] The lower cover 100 has a groove 110 and a vent 120 from top to bottom, and the groove 110 is connected to the vent 120. The lower surface of the lower cover 100 has a sealing groove 130 coaxial with the vent 120. A sealing ring 140 is installed in the sealing groove 130, thereby achieving the sealing between this application and the external device, so that gas can be introduced into this application.

[0038] The upper cover 200 is connected to the top of the lower cover 100. The bottom of the upper cover 200 is provided with a mounting groove 210 and a sliding groove 220 from bottom to top. The mounting groove 210 and the sliding groove 220 are interconnected. The top wall of the mounting groove 210 is recessed upward to form a first slot 211. A positioning pin 230 is installed in the first slot 211. The positioning pin 230 has a lower half extending into the mounting groove 210. The lower half consists of a straight section 231 and a tapered section 232 from top to bottom.

[0039] The piston 300 includes a piston body 310 and a guide portion 320 connected to the top of the piston body 310. The piston body 310 cooperates with the mounting groove 210, and the guide portion 320 cooperates with the sliding groove 220. The top of the piston body 310 is provided with a positioning pin hole 311, and the lower half is located in the positioning pin hole 311. The straight section 231 cooperates with the positioning pin hole 311 to achieve positioning.

[0040] The diaphragm 400 is sealed between the lower cover 100 and the upper cover 200.

[0041] The cylinder operates as follows: air is pumped into the cylinder through the vent 120, causing the diaphragm 400 to deform and push out the piston 300 (this is the first stroke), bringing the piston 300 into contact with the workpiece to be pressed. During the first stroke, the piston 300 needs to be positioned to prevent it from rotating circumferentially. Then, driven by an external device, the entire cylinder is pushed out (the second stroke). As the second stroke progresses, the piston 300 retracts, thus crimping the workpiece.

[0042] Specifically, in this embodiment, the bottom of the positioning pin 230 is divided into a straight section 231 and a tapered section 232. During the first stroke, the tapered section 232 provides initial positioning and guidance. Then, during the pressing process, the straight section 231 (i.e., the positioning section) engages with the positioning pin hole 311 to achieve positioning. This ensures that the cylinder piston 300 can disengage from the positioning section more quickly during downward pressure, reducing friction on the positioning pin hole 311. Furthermore, even if the cylinder is not pressed down in a vertical position, the positioning pin 230 and the positioning pin hole 311 will not become stuck, thus avoiding abnormal wear.

[0043] Furthermore, there are two positioning pins 230 and two positioning pin holes 311, with the positioning pin holes 311 and positioning pins 230 being set in a one-to-one correspondence; the two positioning pin holes 311 are arranged symmetrically along the radial direction of the piston 300.

[0044] Furthermore, the mating length between the locating pin 230 and the locating pin hole 311 is 0.5mm, which is the effective positioning length. Specifically, the effective positioning length of 0.5mm is sufficient to meet the positioning requirements; at the same time, it allows the piston to disengage from the locating pin 230 as early as possible during the second stroke pressing, thereby reducing friction and improving service life.

[0045] Furthermore, this application also includes a guide pin 240 and a guide pin hole 312; the top wall of the mounting groove 210 is recessed upward to form a second groove 212, the guide pin 240 is installed in the second groove 212, and the bottom end of the guide pin 240 extends into the mounting groove 210; the guide pin hole 312 is disposed on the top of the piston body 310, and the guide pin hole 312 mates with the guide pin 240; the mating clearance between the guide pin hole 312 and the guide pin 240 is greater than the mating clearance between the positioning pin 230 and the positioning pin hole 311. In some embodiments, the mating clearance between the guide pin hole 312 and the guide pin is 50 s, and the mating clearance between the positioning pin 230 and the positioning pin hole 311 is 1~2 s. In some embodiments, there are two guide pins 240 and two guide pin holes 312, and the guide pin holes 312 and the guide pins 240 are arranged in a one-to-one correspondence; the two guide pin holes 312 are symmetrically arranged along the radial direction of the piston 300. In some embodiments, the two guide pin holes 312 and the two positioning pins 230 are arranged at 90-degree intervals along the circumference. Specifically, in this embodiment, the guide pins 240 cooperate with the guide pin holes 312 to guide the up-and-down movement of the piston 300.

[0046] Furthermore, the guide pin 240 is interference-fitted with the second slot 212; the top of the upper cover 200 is provided with a second through hole 250, which communicates with the second slot 212. Specifically, due to precision requirements, an interference fit between the guide pin 240 and the second slot 212 is often used. For example, external force is used to hammer the guide pin 240 into the second slot 212. During this process, as the depth of the guide pin 240 into the second slot 212 increases, the gas pressure in the second slot 212 increases, thereby gradually increasing the hammering force. This may result in either the guide pin 240 not being able to fully enter the second slot 212, or the hammering force being increased to forcibly hammer the guide pin 240 into the second slot 212, but this can easily crack the upper cover 200, affecting its service life. To solve this problem, this application provides a second through hole 250 that communicates with the second slot 212, so that during the tapping process, the gas in the second slot 212 will be discharged from the second through hole 250.

[0047] Furthermore, the positioning pin 230 is interference-fitted with the first slot 211; the top of the upper cover 200 is provided with a first through hole 260, which communicates with the first slot 211. The first through hole 260 and the second through hole 250 have the same beneficial effects, which will not be described in detail here.

[0048] Furthermore, at the connection point of the upper cover 200, the lower cover 100, and the diaphragm 400, one of the upper cover 200 and the lower cover 100 has an opening 500 on its outer side that communicates with the outside, and the opening 500 has a rounded transition at the point where it contacts the diaphragm 400. Specifically, since the diaphragm 400 is an elastic structure, in this embodiment, an opening 500 is provided on one side of the sealing connection point. In this way, the upper cover 200 and the lower cover 100 at the position without the opening 500 clamp and press down on the diaphragm 400, and then the diaphragm 400 at the position with the opening 500 is not subjected to downward pressure, so it will expand towards the opening 500, thereby achieving a seal.

[0049] Furthermore, the bottom wall of the groove 110 is recessed downwards to form a groove 150, which is located below the diaphragm 400. Specifically, during the retraction of the piston 300, the diaphragm 400 is brought to the bottom wall of the groove 110, and the diaphragm 400 comes into contact with and adheres to the bottom wall of the groove 110. When the piston 300 extends, a relatively large force is required to separate the diaphragm 400 from the bottom wall of the groove 110, which may cause the diaphragm 400 to tear or be damaged. This application provides the groove 150, which reduces the contact area between the diaphragm 400 and the bottom wall of the groove 110, thereby reducing the force required to separate the diaphragm 400 from the bottom wall of the groove 110, and thus improving the service life of the diaphragm 400.

[0050] Furthermore, the piston 300 has multiple threaded holes 330 on its top; the piston 300 also has a first locating pin 340 protruding from its upper surface, and the docking device also has a pin hole that mates with the first locating pin 340. Specifically, the first locating pin 340 provides initial positioning, and then the threaded holes 330 are connected to other devices via bolts, which facilitates rapid installation and improves installation accuracy.

[0051] Furthermore, the bottom of the lower cover 100 is provided with multiple connecting holes 160, and the docking device is provided with connecting holes 160 corresponding to the connecting holes 160; the bottom of the lower cover 100 is provided with a second positioning pin 170 protruding from its lower surface, and the docking device is also provided with a pin hole that mates with the second positioning pin 170. Specifically, the second positioning pin 170 is used for positioning first, and then the connecting holes 160 are connected to other equipment by bolts, thereby realizing the detachable connection of the diaphragm 400 cylinder to other equipment and improving installation accuracy.

[0052] Furthermore, the lower cover 100 and the upper cover 200 are connected by multiple bolts. Specifically, this embodiment facilitates the installation and disassembly of the lower cover 100 and the upper cover 200, and is relatively inexpensive.

[0053] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A diaphragm cylinder with positioning function, characterized in that: include: The lower cover has a groove and a vent from top to bottom, and the groove and the vent are connected. The upper cover is connected to the top of the lower cover. The bottom of the upper cover is provided with a mounting groove and a sliding groove from bottom to top. The mounting groove and the sliding groove are interconnected. The top wall of the mounting groove is recessed upward to form a first slot hole. A positioning pin is installed in the first slot hole. The positioning pin has a lower half extending into the mounting groove. The lower half consists of a straight section and a tapered section from top to bottom. A piston includes a piston body and a guide portion connected to the top of the piston body. The piston body mates with the mounting groove, and the guide portion mates with the sliding groove. The top of the piston body is provided with a positioning pin hole, the lower half of which is located in the positioning pin hole, and the straight segment mates with the positioning pin hole to achieve positioning. A diaphragm is used to seal between the lower cover and the upper cover.

2. The diaphragm cylinder with positioning function according to claim 1, characterized in that: There are two positioning pins and two positioning pin holes, with each positioning pin corresponding to a different positioning pin; the two positioning pin holes are arranged symmetrically along the radial direction of the piston.

3. The diaphragm cylinder with positioning function according to claim 1, characterized in that: The positioning pin is interference-fitted with the first slot; the top of the upper cover is provided with a first through hole, which communicates with the first slot.

4. The diaphragm cylinder with positioning function according to claim 1, characterized in that: The mating length between the positioning pin and the positioning pin hole is 0.5 mm.

5. The diaphragm cylinder with positioning function according to claim 1, characterized in that: It also includes a guide pin and a guide pin hole; the top wall of the mounting groove is recessed upward to form a second groove hole, the guide pin is installed in the second groove hole, and the bottom end of the guide pin extends into the mounting groove; the guide pin hole is located on the top of the piston body, and the guide pin hole cooperates with the guide pin; the cooperation clearance between the guide pin hole and the guide pin is greater than the cooperation clearance between the positioning pin and the positioning pin hole.

6. The diaphragm cylinder with positioning function according to claim 5, characterized in that: The guide pin is interference-fitted with the second slot; the top of the upper cover is provided with a second through hole, which communicates with the second slot.

7. The diaphragm cylinder with positioning function according to claim 1, characterized in that: At the location where the upper cover, the lower cover, and the diaphragm are connected, one of the upper cover and the lower cover has an opening on its outer side that communicates with the outside, and the opening has a rounded transition at the position where it contacts the diaphragm.

8. The diaphragm cylinder with positioning function according to claim 1, characterized in that: The bottom wall of the tank is recessed downward to form a groove, which is located below the diaphragm.

9. The diaphragm cylinder with positioning function according to claim 1, characterized in that: The piston has multiple threaded holes at its top; the piston also has a first locating pin protruding from its upper surface at its top. And / or, the bottom of the lower cover is provided with a plurality of connecting holes; the bottom of the lower cover is provided with a second positioning pin protruding from its lower surface.

10. The diaphragm cylinder with positioning function according to claim 1, characterized in that: The lower cover and the upper cover are connected by multiple bolts.

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