Needle guard opening and closing device

Abstract

The utility model provides a kind of needle blocking opening and closing device, it can realize needle blocking quick opening, it can also be applicable to the opening of needle blocking mechanism that small range deviation occurs in movable shaft simultaneously.It includes fixed plate, push rod assembly, driving mechanism, fixed plate is connected with driving mechanism, push rod assembly includes push rod, connecting rod, spring one, contact platform, magnetic piece, push rod is connected with fixed plate, push rod end is equipped with installation cavity, connecting rod bottom is arranged in installation cavity, the top end of connecting rod is connected with contact platform and is drawn out installation cavity, magnetic piece is fixed in the upper portion of push rod assembly, contact platform and push rod are equipped with spring one between, when contact platform is not contacted with movable shaft, contact platform and push rod have certain gap between, connecting rod can rotate within certain angle in installation cavity along with contact platform, and make contact platform and push rod end contact.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic cell processing technology, specifically a pin-blocking opening and closing device. Background Technology

[0002] Among existing photovoltaic cell manufacturing technologies, heterojunction (HJT) cells are hailed as the next-generation high-efficiency cell technology with the greatest industrial potential due to their advantages such as high conversion efficiency, short process flow, thin silicon wafer application, low temperature coefficient, and bifacial power generation capability. Chemical Vapor Deposition (CVD) is the core process for HJT cell fabrication, and heterojunction amorphous silicon thin film deposition technologies mainly include two routes: PECVD (Plasma Enhanced CVD) and HWCVD (Hot Wire CVD).

[0003] HWCVD employs vertical deposition and vertical transport, therefore the carrier plate supporting the silicon wafer must also be vertical. Figure 1 In order to prevent the silicon wafer 101 from falling during transport, the existing vertical carrier 100 is designed with a pin-blocking mechanism to block the silicon wafer. The specific structure of the pin-blocking mechanism is as follows: Figure 2 As shown, the stop pin 102 is rotatably connected inside the stop pin mounting block 103. The stop pin mounting block 103 is provided with a clearance groove for the stop pin 102 to rotate upward. The stop pin mounting block 103 is also connected to a movable shaft 104. The stop pin 102 passes through the movable shaft 104. A stop pin spring 105 is provided between the movable shaft 104 and the stop pin mounting block 103. Under normal circumstances, the stop pin 102 is kept closed by the action of the stop pin spring 105 (closed means it is located on the silicon wafer and blocks the silicon wafer). When picking up and putting in the silicon wafer on the carrier board, the stop pin 102 needs to be opened. After the silicon wafer is placed, the stop pin 102 is closed. If the stop pins are operated one by one, it is very time-consuming and laborious. Utility Model Content

[0004] To address the problem of how to easily open the pins on the carrier plate carrying the silicon wafer, this utility model provides a pin opening and closing device, which can realize the rapid opening of the pins, and is also suitable for opening the pin mechanism when the movable axis deviates slightly.

[0005] The technical solution is as follows: a needle blocking opening and closing device, which includes a fixed plate, a push rod assembly, and a drive mechanism. The fixed plate is connected to the drive mechanism, and the push rod assembly is installed on the fixed plate. The characteristic is that: the push rod assembly has multiple components and their positions correspond to the positions of the movable shafts of multiple or all the needle blocking mechanisms on the vertical carrier plate.

[0006] The push rod assembly includes a push rod, a connecting rod, a spring, a contact platform, and a magnetic component. The push rod is connected to the fixed plate, and the end of the push rod has a mounting cavity. The bottom of the connecting rod is disposed in the mounting cavity, and the top of the connecting rod extends out of the mounting cavity and connects to the contact platform. The magnetic component is fixed to the upper part of the push rod assembly. The spring is disposed between the contact platform and the push rod. When the contact platform is not in contact with the movable shaft, there is a certain gap between the contact platform and the push rod. The connecting rod can rotate within a certain angle within the mounting cavity along with the contact platform, and make the contact platform contact the end of the push rod.

[0007] Furthermore, the push rod has a movable cavity in the middle, the connecting rod is T-shaped and its protruding end is located in the movable cavity, a limiting ring extending towards the axis of the push rod is provided between the movable cavity and the mounting cavity, the limiting ring is used to keep the protruding end of the connecting rod in the movable cavity, one end of the spring contacts the top of the limiting ring and the other end contacts the bottom of the contact platform.

[0008] Furthermore, the magnetic component is located at the top of the connecting rod and at the bottom center of the contact platform.

[0009] Furthermore, the push rod is slidably connected to the fixed plate, and a second spring is provided between the push rod and the fixed plate.

[0010] Furthermore, the second spring has a greater resistance to deformation than the first spring.

[0011] Furthermore, the push rod is slidably connected to the fixed plate via a sliding bearing, and the push rod is provided with a spring mounting block protruding from the periphery of the push rod. The top of the second spring abuts against the bottom of the spring mounting block, and the bottom of the second spring contacts the shoulder of the sliding bearing.

[0012] Beneficial effects: 1. The drive mechanism can move the fixed plate and make the push rod assembly close to the movable shaft of multiple or all the stop pin mechanisms on the vertical carrier plate. By pushing out the movable shaft, the stop pins are opened. This can open most or all of the stop pins at one time, which is convenient for use.

[0013] 2. By setting up magnetic components, the push rod can be guided to adhere to the metal movable shaft when it moves upward, so that the contact platform and the end face of the movable shaft are kept as aligned as possible.

[0014] 3. For some movable shafts that experience slight positional deviations, the contact platform can be rotated to make it make hard contact with the push rod, thereby applying sufficient force to push the movable shaft out. Attached Figure Description

[0015] Figure 1 A partial structural diagram of the carrier plate that supports the silicon wafer;

[0016] Figure 2 This is a schematic diagram of the needle-stopping mechanism;

[0017] Figure 3 This is a schematic diagram of the structure of this utility model;

[0018] Figure 4 This is a schematic diagram of the push rod assembly structure;

[0019] Figure 5 for Figure 4 A cross-sectional view;

[0020] Figure 6 This is a schematic diagram of the contact platform that is rotating. Detailed Implementation

[0021] like Figures 3-5 The device shown includes a pin stop opening and closing device, which includes a fixed plate 1, a push rod assembly 2, and a drive mechanism 3. The fixed plate 1 is connected to the drive mechanism 3. The drive mechanism 3 can be a lifting cylinder to drive the fixed plate 1 to move. The push rod assembly 2 is installed on the fixed plate 1. There are multiple push rod assemblies 2, and their positions correspond to the positions of the movable shafts of multiple or all the pin stop mechanisms on the vertical carrier plate.

[0022] The push rod assembly includes a push rod 21, a connecting rod 22, a spring 23, a contact platform 24, and a magnetic component 25. The push rod 21 is connected to the fixed plate 1. The end of the push rod 21 has a mounting cavity 26 (which can be integrally formed with or welded to the push rod 21). The bottom of the connecting rod 22 is located within the mounting cavity 26, and the top of the connecting rod 22 extends out of the mounting cavity 26 and is fixedly connected to the contact platform 24. The magnetic component 25 is fixed to the upper part of the push rod assembly 2. A spring 23 is provided between the contact platform 24 and the push rod 21. When the contact platform 24 is not in contact with the movable shaft, there is a certain gap between the contact platform 24 and the push rod 21. Figure 6 (Not at the limit position shown in the figure), the connecting rod 22 can rotate within a certain angle with the contact platform 24 in the mounting cavity 26, and make the contact platform 24 contact the end of the push rod 21.

[0023] In use, the drive mechanism 3 drives the fixed plate 1 and the push rod assembly 2 to move upward. During the movement, the magnetic component 25 guides and attracts the metal movable shaft on the stop pin mechanism, thereby aligning the push rod assembly 2 with the movable shaft. As the push rod assembly 2 rises further, the deformation of the spring 23 generates a flexible force to push the movable shaft up, thus opening the stop pin. However, sometimes due to the thermal expansion and contraction of the carrier plate, the movable shaft on the stop pin assembly may deviate from the center range of the magnetic force of the push rod assembly. When the attraction force of the magnetic component 25 cannot guide it, the side of the contact platform 24 will contact the movable shaft. As the push rod assembly 2 continues to rise, the support platform 24 will tilt towards the force point to guide and match the position of the movable shaft of the stop pin mechanism. When the gap of about 2mm below the contact platform 24 on the push rod 21 is completely compressed, that is, when the contact platform 24 rotates to its limit position, the contact platform 24 forms a hard contact with the entire push rod 21 and continues to push to open the stop pin.

[0024] When closed, the drive mechanism 3 drives the push rod assembly 2 to move downward, and the magnetic component 25 and the needle-stopping spring on the needle-stopping mechanism act on the movable shaft at the same time to make the needle-stopping pin descend rapidly, thereby achieving the closing of the needle-stopping pin.

[0025] Specifically, in combination Figure 5 The push rod 21 has a movable cavity 27 in the middle. The connecting rod 22 is T-shaped with its protruding end located inside the movable cavity 27. A limiting ring extending towards the axis of the push rod 21 is provided between the movable cavity 27 and the mounting cavity 26. The limiting ring is used to keep the protruding end of the connecting rod 22 in the movable cavity 27, that is, the inner wall of the limiting ring is directly smaller than the diameter of the protruding end of the connecting rod 22. One end of the spring 23 contacts the top of the limiting ring, and the other end contacts the bottom of the contact platform 24. The magnetic component 25 is located at the top of the connecting rod 22 and the center of the bottom of the contact platform 24, and can be fixed to the connecting component 22 by welding.

[0026] Furthermore, to ensure that the movable shaft can still be pushed by a flexible force even when the contact platform 24 makes hard contact with the entire push rod 21 and continues to push to open the stop pin, the push rod 21 is slidably connected to the fixed plate 1, and a second spring 4 is provided between the push rod 21 and the fixed plate 1. The deformation resistance of the second spring 4 is greater than that of the first spring 23. With this arrangement, under normal circumstances, the first spring 23 first generates a flexible force through deformation and applies it to the movable shaft. Only when the contact platform 24 and the push rod 21 make hard contact does the deformation of the second spring 4 generate a flexible force and apply it to the movable shaft. In both cases, the movable shaft is pushed by the deformation of either the first spring 23 or the second spring 4 first, which can prevent the stop pin from getting stuck and affecting the overall opening of the stop pin.

[0027] The specific structure described above is as follows, combined with Figure 4 , Figure 5The push rod 21 is slidably connected to the fixed plate 1 via the sliding bearing 5 (the specific structure of the sliding bearing is omitted in the figure). The push rod 21 is provided with a spring mounting block 28 protruding from the periphery of the push rod 21. The top of the spring 4 abuts against the bottom of the spring mounting block 28, and the bottom of the spring 4 contacts the shoulder of the sliding bearing 5.

[0028] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the scope of protection of this utility model. Therefore, the scope of protection of this utility model should be determined by the scope of the claims.

Claims

1. A pin stop opening and closing device, comprising a fixed plate, a push rod assembly, and a driving mechanism, wherein the fixed plate is connected to the driving mechanism, and the push rod assembly is mounted on the fixed plate, characterized in that: The push rod assembly has multiple components, and their positions correspond to the positions of the movable shafts of multiple or all of the pin-stopping mechanisms on the vertical carrier plate. The push rod assembly includes a push rod, a connecting rod, a spring, a contact platform, and a magnetic component. The push rod is connected to the fixed plate, and the end of the push rod has a mounting cavity. The bottom of the connecting rod is disposed in the mounting cavity, and the top of the connecting rod extends out of the mounting cavity and connects to the contact platform. The magnetic component is fixed to the upper part of the push rod assembly. The spring is disposed between the contact platform and the push rod. When the contact platform is not in contact with the movable shaft, there is a certain gap between the contact platform and the push rod. The connecting rod can rotate within a certain angle within the mounting cavity along with the contact platform, and make the contact platform contact the end of the push rod.

2. The pin stop opening and closing device according to claim 1, characterized in that: The push rod has a movable cavity in the middle. The connecting rod is T-shaped and its protruding end is located in the movable cavity. A limiting ring extending towards the axis of the push rod is provided between the movable cavity and the mounting cavity. The limiting ring is used to keep the protruding end of the connecting rod in the movable cavity. One end of the spring contacts the top of the limiting ring, and the other end contacts the bottom of the contact platform.

3. A pin stop opening and closing device according to claim 1 or 2, characterized in that: The magnetic component is located at the top of the connecting rod and at the bottom center of the contact platform.

4. The pin stop opening and closing device according to claim 1, characterized in that: The push rod is slidably connected to the fixed plate, and a spring is provided between the push rod and the fixed plate.

5. The pin stop opening and closing device according to claim 4, characterized in that: The second spring has a greater resistance to deformation than the first spring.

6. A pin stop opening and closing device according to claim 4 or 5, characterized in that: The push rod is slidably connected to the fixed plate via a sliding bearing. The push rod is provided with a spring mounting block protruding from the periphery of the push rod. The top of the second spring abuts against the bottom of the spring mounting block, and the bottom of the second spring contacts the shoulder of the sliding bearing.

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