Quartz crucible detection device

Abstract

The invention discloses a quartz crucible detection device, and relates to the technical field of quartz crucible detection. The device comprises a supporting and clamping assembly, the supporting and clamping assembly comprises a transmission adjusting plate, the upper surface of the transmission adjusting plate is fixedly connected with a transmission supporting plate, one end of the transmission supporting plate is fixedly connected with a clamping limiting plate, and the upper surface of one clamping limiting plate is fixedly provided with a pressing-down measuring assembly. The pressing measuring assembly comprises a hollow supporting column and a pressing supporting plate, a guide sliding way is formed in the peripheral side face of the hollow supporting column, a pressing transmission column is fixedly connected to one side face of the pressing supporting plate, and the pressing transmission column is in sliding fit with the guide sliding way. Through synchronous horizontal movement of a transmission supporting plate, the transmission supporting plate enables clamping limiting plates to be close to each other until the clamping limiting plates are attached to the circumferential side face of a crucible, a downward pressing transmission column slides along the interior of a guide sliding way, and a downward pressing supporting plate rotates by 90 degrees and moves downwards; detection of the diameter of the crucible and detection of the thickness of the bottom of the crucible are realized.

Description

Technical Field

[0001] The invention belongs to the technical field of quartz crucible detection, and in particular relates to a quartz crucible detection device. Background Art

[0002] Quartz crucible is a consumable quartz device used to hold polysilicon raw materials. It is mainly used to support continuous crystal pulling under high temperature conditions. With the vigorous development of new energy demand, the prospects of the photovoltaic industry have been further improved, which has increased the demand for quartz crucibles and high-purity quartz sand. Due to the increasing size and service life of photovoltaic crucibles, testing can ensure that the quality and performance of quartz crucibles meet the use requirements, providing reliable protection for industrial production.

[0003] When testing a quartz crucible, the size of the crucible can be detected to easily determine the capacity of the material that the quartz crucible can store. By detecting the thickness of the bottom of the quartz crucible, the heating condition of the quartz crucible can be easily determined. When testing a common quartz crucible, a ruler is used to measure the corresponding size of the quartz crucible. However, the position offset of the crucible during the measurement process can easily affect the accuracy of the detection value. To this end, we provide a quartz crucible detection device to solve the above technical problems. Summary of the invention

[0004] The object of the present invention is to provide a quartz crucible detection device, which solves the problems in the above technical background through the specific structural design of the supporting clamping component and the pressing measuring component.

[0005] In order to solve the above technical problems, the present invention is achieved through the following technical solutions:

[0006] The present invention discloses a quartz crucible detection device, comprising a supporting and clamping assembly, wherein the supporting and clamping assembly comprises four transmission adjustment plates, adjacent two side surfaces of the transmission adjustment plates are both inclined sliding surface structures, the transmission adjustment plate is slidably matched with two adjacent transmission adjustment plates, the upper surface of the transmission adjustment plate is fixedly connected with a transmission support plate through a first supporting column, one end of the transmission support plate is fixedly connected with a clamping limit plate through a second transmission column, the transmission adjustment plates are controlled to move horizontally synchronously, the transmission adjustment plates slide along the side surfaces of adjacent transmission adjustment plates, and the clamping limit plates are brought close to each other through the transmission support plates until the clamping limit plates are fitted with the side surfaces of the crucible, the diameter of the crucible can be detected by the moving distance of the two relatively arranged clamping limit plates, and it is also convenient to limit the position of the crucible, which is convenient for subsequent detection.

[0007] A downward pressure measuring component is fixedly installed on the upper surface of one of the clamping limit plates, and the downward pressure measuring component includes a hollow support column and a downward pressure support plate. A guide slide is provided on the side surface of the hollow support column, and the guide slide is composed of a spiral slide connected to a vertical slide. A downward pressure transmission column is fixedly connected to one side of the downward pressure support plate, and the downward pressure transmission column and the guide slide are slidably matched.

[0008] The present invention is further configured as follows: the support clamping assembly also includes a support base, a support frame is fixedly connected to the upper surface of the support base, a clamping transmission slideway corresponding to the clamping limit plate is opened on the upper surface of the support frame, a support platform is fixedly connected to the upper surface of the support frame, and a downward pressure adjustment groove and an installation groove are opened on the upper surface of one of the clamping limit plates; a transmission ring is rotatably arranged on the upper surface of the support base, a transmission inner gear ring is fixedly connected to the inner wall of the transmission ring, a placement groove is opened on the circumferential side of the transmission ring, and an arc-shaped rack is fixedly connected inside the placement groove.

[0009] The present invention is further configured as follows: a driving gear is rotatably connected to the upper surface of the support base, the driving gear and the arc-shaped rack are meshed with each other, a driving motor is fixedly installed on the lower surface of the support base, and the output shaft of the driving motor is fixedly connected to the driving gear; a transmission gear corresponding to a transmission adjustment plate is rotatably provided on the upper surface of the support base, the transmission gear and the transmission inner gear ring are meshed with each other, and a transmission adjustment groove corresponding to the transmission adjustment plate is opened on the upper surface of the support base.

[0010] The present invention is further configured such that a transmission adjustment column is fixedly connected to the lower surface of the transmission adjustment plate, the transmission adjustment column is slidably arranged inside the corresponding transmission adjustment groove, a transmission rack is fixedly connected to one side of the transmission adjustment plate, and the transmission rack and the corresponding transmission gear are meshed with each other.

[0011] The present invention is further configured such that the downward pressure measuring assembly also includes a horizontal support plate fixedly connected to the upper surface of the corresponding clamping limit plate, the upper surface of the horizontal support plate is provided with a through opening coaxial with the downward pressure adjustment groove, and the hollow support column is fixedly connected to the upper surface of the horizontal support plate; a downward pressure pillar is coaxially slidably arranged inside the hollow support column, one end of the downward pressure transmission column is fixedly connected to the peripheral side surface of the downward pressure pillar, and the lower surface of the downward pressure support plate is fixedly connected to a downward pressure disc through a downward pressure column.

[0012] The present invention is further configured such that the lower surface of the downward pressure pillar is rotatably connected with an adjustment pillar, the lower surface of the adjustment pillar is fixedly connected with an adjustment disk, the adjustment disk is slidably matched with the downward pressure adjustment groove, and a return spring is fixedly connected between the adjustment disk and the bottom of the downward pressure adjustment groove; an electric push rod is fixedly installed on the lower surface of the horizontal support plate, the electric push rod is located inside the installation groove, the electric push rod output shaft passes through one end of the horizontal support plate and is fixedly connected with a downward pressure driving plate, and the downward pressure driving plate is tightly attached to the upper surface of the downward pressure pillar.

[0013] The present invention has the following beneficial effects:

[0014] 1. The present invention controls the rotation of the transmission inner gear ring by setting a support clamping assembly, drives the transmission gear to rotate, and under the meshing action of the transmission gear and the transmission rack, the transmission adjustment plate moves horizontally synchronously, and under the connection action of the transmission support plate, the clamping limit plates move synchronously and approach each other until the clamping limit plates are in close contact with the side surface of the crucible, thereby realizing the detection of the size of the crucible so that the diameter detection size is accurate.

[0015] 2. The present invention sets a downward pressure measuring component, the downward pressure driving plate moves downward, and the downward pressure support plate moves downward synchronously. Under the sliding cooperation between the downward pressure transmission column and the spiral slide, the downward pressure support plate drives the downward pressure disc to rotate 90°. When the downward pressure transmission column slides along the vertical slide, the downward pressure support plate drives the downward pressure disc to move downward, thereby realizing the detection of the bottom thickness of the crucible.

[0016] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0018] Figure 1 The figure is a schematic diagram of the structure of a quartz crucible detection device.

[0019] Figure 2 It is a schematic structural diagram of the supporting and clamping assembly in the present invention.

[0020] Figure 3 It is a schematic diagram of the structure of the support and clamping assembly from another angle in the present invention.

[0021] Figure 4 It is a partial structural schematic diagram of the supporting clamping assembly in the present invention.

[0022] Figure 5 It is a partial structural transverse cross-sectional view of the support and clamping assembly in the present invention.

[0023] Figure 6 It is a partial structural schematic diagram of the supporting clamping assembly in the present invention.

[0024] Figure 7 It is a structural schematic diagram of the downward pressure measurement component in the present invention.

[0025] Figure 8 It is a longitudinal structural cross-sectional view of the downward pressure measurement component in the present invention.

[0026] Fig. 9 for Figure 8 A local enlarged schematic diagram of point A in the middle.

[0027] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0028] 1-support clamping assembly, 101-transmission adjustment plate, 102-transmission support plate, 103-clamping limit plate, 104-support base, 105-support frame, 106-clamping transmission slideway, 107-support table, 108-downward pressure adjustment groove, 109-transmission ring, 110-transmission inner gear ring, 111-arc rack, 112-drive gear, 113-drive motor, 114-transmission gear, 115- Transmission adjustment groove, 116-transmission adjustment column, 117-transmission rack, 2-downward pressure measuring component, 201-hollow support column, 202-downward pressure support plate, 203-guide slide, 204-downward pressure transmission column, 205-horizontal support plate, 206-downward pressure support column, 207-downward pressure disc, 208-adjustment support column, 209-adjustment disc, 210-reset spring, 211-electric push rod, 212-downward pressure drive plate. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] For specific embodiment 1, please refer to Figure 1-9 The present invention is a quartz crucible detection device, including a support clamping assembly 1. Specifically, the support clamping assembly 1 includes four transmission adjustment plates 101. Initially, the transmission adjustment plates 101 are attached to each other to form a closed plane (such as Figure 4As shown in the figure, the two adjacent side surfaces of the transmission adjustment plate 101 are both inclined sliding surface structures, the inclined sliding surface of one side surface of the transmission adjustment plate 101 is longer than the inclined sliding surface of the other adjacent side surface, and the longer inclined sliding surface of the transmission adjustment plate 101 slides with the shorter inclined sliding surface of the other adjacent transmission adjustment plate 101, and the transmission adjustment plate 101 slides with the two adjacent transmission adjustment plates 101, and the upper surface of the transmission adjustment plate 101 is fixedly connected with the transmission support plate 102 through the first support column, and one end of the transmission support plate 102 is fixedly connected with the clamping limit plate 103 through the second transmission column, and the transmission adjustment plate 101 is controlled to move horizontally synchronously, and the transmission adjustment plate 101 slides along the side surfaces of the adjacent transmission adjustment plates 101, and the clamping limit plates 103 are brought close to each other through the transmission support plate 102 until the clamping limit plates 103 are in contact with the side surfaces of the crucible, and the diameter of the crucible can be detected by the moving distance of the two relatively arranged clamping limit plates 103.

[0031] Furthermore, a downward pressure measuring component 2 is fixedly installed on the upper surface of one of the clamping limit plates 103, and the downward pressure measuring component 2 includes a hollow support column 201 and a downward pressure support plate 202. A guide slide 203 is opened on the side surface of the hollow support column 201, and the guide slide 203 is composed of a spiral slide connected to a vertical slide. A downward pressure transmission column 204 is fixedly connected to one side of the downward pressure support plate 202. The downward pressure transmission column 204 and the guide slide 203 are slidably matched. The thickness of the bottom of the crucible can be detected by the downward movement height of the downward pressure support plate 202.

[0032] The operation process of this embodiment is as follows: the crucible to be tested is placed on the upper surface of the supporting clamping assembly 1, and the transmission adjustment plate 101 is controlled to move horizontally synchronously, and the transmission adjustment plate 101 slides along the side of the adjacent transmission adjustment plate 101. At the same time, the transmission support plate 102 makes the clamping limit plates 103 approach each other until the clamping limit plates 103 are in contact with the side surfaces of the crucible. The diameter of the crucible can be detected by the movement distance of the two relatively arranged clamping limit plates 103; when the crucible is clamped and fixed, the pressing support plate 202 is controlled to move downward so that the pressing transmission column 204 slides along the inside of the guide slide 203, and when the pressing transmission column 204 slides along the inside of the spiral slide, the pressing support plate 202 is rotated to the top of the crucible, and when the pressing transmission column 204 slides along the inside of the vertical slide, the pressing support plate 202 moves downward, and the thickness of the bottom of the crucible can be obtained by the downward movement distance of the pressing support plate 202.

[0033] For specific embodiment 2, please refer to Figure 2-6On the basis of the first specific embodiment, specifically, the support and clamping assembly 1 also includes a support base 104, a support frame 105 is fixedly connected to the upper surface of the support base 104, a clamping transmission slideway 106 corresponding to the clamping limit plate 103 is opened on the upper surface of the support frame 105, a support platform 107 is fixedly connected to the upper surface of the support frame 105, and a downward pressure adjustment groove 108 and an installation groove are opened on the upper surface of one of the clamping limit plates 103; a transmission ring 109 is rotatably set on the upper surface of the support base 104, the transmission ring 109 is located inside the support frame 105, a transmission inner gear ring 110 is fixedly connected to the inner wall of the transmission ring 109, a placement groove is opened on the side surface of the transmission ring 109, and an arc-shaped rack 111 is fixedly connected inside the placement groove.

[0034] Furthermore, a driving gear 112 is rotatably connected to the upper surface of the support base 104, and the driving gear 112 and the arc-shaped rack 111 are meshed with each other. A driving motor 113 is fixedly installed on the lower surface of the support base 104, and the output shaft of the driving motor 113 is fixedly connected to the driving gear 112; a transmission gear 114 corresponding to the transmission adjustment plate 101 is rotatably provided on the upper surface of the support base 104, and the transmission gear 114 and the transmission inner gear ring 110 are meshed with each other, and a transmission adjustment groove 115 corresponding to the transmission adjustment plate 101 is opened on the upper surface of the support base 104.

[0035] Furthermore, a transmission adjustment column 116 is fixedly connected to the lower surface of the transmission adjustment plate 101, and the transmission adjustment column 116 is slidably set inside the corresponding transmission adjustment groove 115. A transmission rack 117 is fixedly connected to one side of the transmission adjustment plate 101, and the transmission rack 117 and the corresponding transmission gear 114 are meshed with each other.

[0036] The operation process of this embodiment is as follows: put the support platform 107 to be tested, start the driving motor 113 to drive the driving gear 112 to rotate, under the meshing action of the driving gear 112 and the arc-shaped rack 111, the arc-shaped rack 111 moves and drives the transmission ring 109 to rotate, the transmission inner gear ring 110 rotates synchronously with the transmission ring 109, under the meshing action of the transmission inner gear ring 110 and the transmission gear 114, the transmission gear 114 rotates, under the meshing action of the transmission gear 114 and the transmission rack 117, the transmission rack 117 moves horizontally, Under the sliding cooperation of the transmission adjustment column 116 and the corresponding transmission adjustment groove 115, the transmission adjustment plate 101 moves horizontally synchronously, and the transmission adjustment plates 101 slide against each other. At the same time, during the horizontal movement of the transmission adjustment plate 101, under the connection action of the transmission support plate 102, the second transmission column slides along the inside of the clamping transmission slideway 106, and then the clamping limit plates 103 approach each other until the clamping limit plates 103 are tightly attached to the side surfaces of the crucible. The diameter of the crucible to be tested can be calculated by the distance the clamping limit plates 103 move.

[0037] For specific embodiment 3, please refer to Figure 7-9 On the basis of the first and second specific embodiments, specifically, the downward pressure measuring assembly 2 also includes a horizontal support plate 205 fixedly connected to the upper surface of the corresponding clamping limit plate 103, and the downward pressure measuring assembly 2 moves synchronously with the clamping limit plate 103. The upper surface of the horizontal support plate 205 is provided with a through hole coaxial with the downward pressure adjusting groove 108, and the hollow support column 201 is fixedly connected to the upper surface of the horizontal support plate 205; a downward pressure pillar 206 is coaxially slidably arranged inside the hollow support column 201, one end of the downward pressure transmission column 204 is fixedly connected to the side surface of the downward pressure pillar 206, and the lower surface of the downward pressure support plate 202 is fixedly connected with a downward pressure disc 207 through the downward pressure column. In the initial state, the downward pressure support plate 202 coincides with the upper surface of the clamping limit plate 103. When the downward pressure transmission column 204 slides along the spiral slide, the downward pressure support plate 202 rotates 90°, and the downward pressure disc 207 is located directly above the crucible.

[0038] Furthermore, the lower surface of the downward pressure pillar 206 is rotatably connected to the adjusting pillar 208, and the lower surface of the adjusting pillar 208 is fixedly connected to the adjusting disk 209, the adjusting disk 209 is slidably matched with the downward pressure adjusting groove 108, and a return spring 210 is fixedly connected between the adjusting disk 209 and the bottom of the downward pressure adjusting groove 108; an electric push rod 211 is fixedly installed on the lower surface of the horizontal support plate 205, and the electric push rod 211 is located inside the installation groove. The output shaft of the electric push rod 211 passes through one end of the horizontal support plate 205 and is fixedly connected to a downward pressure driving plate 212, and the downward pressure driving plate 212 is tightly attached to the upper surface of the downward pressure pillar 206.

[0039] The operation process of this embodiment is as follows: after the clamping limit plate 103 clamps and fixes the crucible, the electric push rod 211 is started to drive the pressing driving plate 212 to move downward, and the pressing support 206 is squeezed by the pressing support 206, so that the pressing support 206 slides along the inner wall of the hollow support column 201, and the pressing transmission column 204 moves downward synchronously, and slides inside the pressing transmission column 204 and the guide slide 203, and the pressing transmission column 204 slides inside the guide slide 203, and when the pressing transmission column 204 slides inside the spiral slide, the pressing support plate 202 rotates under the cooperation of the pressing transmission column 204 and the spiral slide, and the pressing transmission column 204 is pressed downward. When the moving column 204 slides to the intersection of the spiral slide and the vertical slide, the downward pressure support plate 202 rotates 90 degrees and is located directly above the crucible. As the downward pressure driving plate 212 continues to move downward, the downward pressure transmission column 204 slides along the inside of the vertical slide, and the downward pressure support plate 202 moves downward, driving the downward pressure disc 207 to move downward synchronously until the downward pressure disc 207 fits the bottom of the crucible. According to the downward pressure distance of the downward pressure disc 207, the thickness of the bottom of the crucible can be detected; during the downward movement of the downward pressure support 206, the adjustment support 208 and the adjustment disc 209 move downward synchronously, so that the reset spring 210 is compressed.

[0040] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0041] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A quartz crucible detection device, comprising a support and clamping assembly (1), characterized in that: The support clamping assembly (1) comprises four transmission adjustment plates (101), two adjacent side surfaces of the transmission adjustment plates (101) are inclined sliding surface structures, the transmission adjustment plate (101) and two adjacent transmission adjustment plates (101) are slidably matched, the upper surface of the transmission adjustment plate (101) is fixedly connected to a transmission support plate (102) via a first support column, one end of the transmission support plate (102) is fixedly connected to a clamping limit plate (103) via a second transmission column, the transmission adjustment plates (101) are controlled to move horizontally synchronously, the transmission adjustment plates (101) slide along the side surfaces of adjacent transmission adjustment plates (101), and the clamping limit plates (103) are brought closer to each other through the transmission support plates (102) until the clamping limit plates (103) are in contact with the side surfaces of the crucible, and the diameter of the crucible can be detected by the moving distance of the two relatively arranged clamping limit plates (103); A downward pressure measuring assembly (2) is fixedly mounted on the upper surface of one of the clamping limit plates (103), and the downward pressure measuring assembly (2) comprises a hollow support column (201) and a downward pressure support plate (202). A guide slideway (203) is provided on the side surface of the hollow support column (201), and the guide slideway (203) is composed of a spiral slideway connected to a vertical slideway. A downward pressure transmission column (204) is fixedly connected to one side surface of the downward pressure support plate (202), and the downward pressure transmission column (204) and the guide slideway (203) are slidably matched.

2. A quartz crucible detection device according to claim 1, characterized in that: The support clamping assembly (1) also includes a support base (104), the upper surface of the support base (104) is fixedly connected to a support frame (105), the upper surface of the support frame (105) is provided with a clamping transmission slideway (106) corresponding one-to-one to the clamping limit plate (103), the upper surface of the support frame (105) is fixedly connected to a support platform (107), and the upper surface of one of the clamping limit plates (103) is provided with a downward pressure adjustment groove (108) and a mounting groove.

3. A quartz crucible detection device according to claim 2, characterized in that: A transmission ring (109) is rotatably arranged on the upper surface of the support base (104), a transmission inner gear ring (110) is fixedly connected to the inner wall of the transmission ring (109), a placement groove is provided on the circumferential side surface of the transmission ring (109), and an arc-shaped rack (111) is fixedly connected inside the placement groove.

4. A quartz crucible detection device according to claim 3, characterized in that: The upper surface of the support base (104) is rotatably connected to a driving gear (112), and the driving gear (112) and the arc-shaped rack (111) are meshed with each other. The lower surface of the support base (104) is fixedly mounted with a driving motor (113), and the output shaft of the driving motor (113) is fixedly connected to the driving gear (112).

5. A quartz crucible detection device according to claim 4, characterized in that: A transmission gear (114) corresponding one-to-one to the transmission adjustment plate (101) is rotatably arranged on the upper surface of the support base (104); the transmission gear (114) and the transmission inner gear ring (110) are meshed with each other; and a transmission adjustment groove (115) corresponding one-to-one to the transmission adjustment plate (101) is opened on the upper surface of the support base (104).

6. A quartz crucible detection device according to claim 5, characterized in that: A transmission adjustment column (116) is fixedly connected to the lower surface of the transmission adjustment plate (101), and the transmission adjustment column (116) is slidably arranged inside the corresponding transmission adjustment groove (115). A transmission rack (117) is fixedly connected to one side of the transmission adjustment plate (101), and the transmission rack (117) and the corresponding transmission gear (114) are meshed with each other.

7. A quartz crucible detection device according to claim 6, characterized in that: The downward pressure measurement assembly (2) also includes a horizontal support plate (205) fixedly connected to the upper surface of the corresponding clamping limit plate (103), the upper surface of the horizontal support plate (205) is provided with a through hole coaxial with the downward pressure adjustment groove (108), and the hollow support column (201) is fixedly connected to the upper surface of the horizontal support plate (205).

8. A quartz crucible detection device according to claim 7, characterized in that: A downward pressure support column (206) is coaxially slidably arranged inside the hollow support column (201), one end of the downward pressure transmission column (204) is fixedly connected to the peripheral side surface of the downward pressure support column (206), and the lower surface of the downward pressure support plate (202) is fixedly connected to a downward pressure disc (207) via a downward pressure column.

9. A quartz crucible detection device according to claim 8, characterized in that: The lower surface of the downward pressure support (206) is rotatably connected to an adjustment support (208), and the lower surface of the adjustment support (208) is fixedly connected to an adjustment disc (209), the adjustment disc (209) is slidably matched with the downward pressure adjustment groove (108), and a return spring (210) is fixedly connected between the adjustment disc (209) and the inner bottom of the downward pressure adjustment groove (108); An electric push rod (211) is fixedly mounted on the lower surface of the horizontal support plate (205), and the electric push rod (211) is located inside the mounting groove. An end of the output shaft of the electric push rod (211) passes through the horizontal support plate (205) and is fixedly connected to a downward pressure driving plate (212), and the downward pressure driving plate (212) is in close contact with the upper surface of the downward pressure support pillar (206).

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