Wedge-shaped sealing structure

Abstract

The utility model discloses a wedge-shaped sealing structure which comprises a wedge-shaped sealing unit, a plate assembly and a driving unit. The wedge-shaped sealing unit comprises a sealing head, a wedge-shaped block and a shaft rod which are coaxially arranged, the sealing head is used for sealing the liquid injection opening and is upwards connected with the wedge-shaped block, and the wedge-shaped block is fixedly arranged on the shaft rod; the plate assembly comprises an upper pressing plate and a lower pressing plate which are arranged in parallel, a wear-resisting block made of a macromolecular wear-resisting material is arranged between the upper pressing plate and the lower pressing plate, the wedge-shaped sealing unit is contained in a concave cavity formed by the lower pressing plate and the end face forming the liquid injection opening, and the inner top face of the concave cavity comprises an inclined face capable of being matched with a wedge-shaped block; the shaft rod upwards penetrates through the upper pressing plate and the lower pressing plate and is connected with the upper pressing plate in an up-down sliding mode, an upper through hole is formed in the upper pressing plate, and a lower through hole is formed in the lower pressing plate. The driving unit can drive the upper pressing plate and the lower pressing plate to slide relatively and horizontally so as to drive the wedge-shaped sealing unit to seal or open the liquid injection opening. The sealing device is reasonable in structure, small in moving space and good in sealing effect.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery production, and specifically to a wedge-shaped sealing structure. Background Art

[0002] Lithium battery liquid injection is a crucial step in the production process of new energy vehicle lithium batteries, which involves precisely and evenly injecting electrolyte into the interior of an assembled but unsealed battery housing. This process is crucial for ensuring battery performance, safety, and lifespan. The entire liquid injection process needs to be carried out under strictly controlled environments, usually operating in a clean and dust-free enclosed space to avoid contamination by moisture and impurities. During the production process, it is necessary to seal the liquid injection port before and after liquid injection. Existing sealing structures often have a simple structure, with multiple sealing heads directly installed on a fixed plate and operating synchronously. As Figure 1 shown, the fixed plate moves up and down to seal or open the liquid injection port. Since the fixed plate is prone to deformation due to forces acting at multiple scattered position points, when the fixed plate deforms or the sealing head wears, problems such as unreliable sealing or excessive compression of the sealing head resulting in permanent deformation will occur, which is not conducive to improving the liquid injection quality. In addition, the sealing method of the existing sealing structure moving up and down occupies a large vertical space, which is likely to limit the layout of other equipment. Utility Model Content

[0003] The present utility model discloses a wedge-shaped sealing structure, which solves the technical problems in the prior art that the liquid injection port sealing structure has a large occupied space during movement, unreliable sealing, and short service life of the sealing head, and has the technical effects of reasonable structure, small movement space, good sealing effect, and being conducive to improving the service life of the sealing head. The technical solutions adopted are as follows:

[0004] A wedge-shaped sealing structure includes a wedge-shaped sealing unit, a plate assembly, and a driving unit;

[0005] The wedge-shaped sealing unit includes a sealing head, a wedge block, and a shaft rod arranged coaxially. The sealing head is used to seal the liquid injection port and is connected upward to the wedge block, and the wedge block is fixedly arranged on the shaft rod;

[0006] The plate assembly includes an upper pressure plate and a lower pressure plate arranged in parallel. There is a wear-resistant block made of a high molecular wear-resistant material between the upper pressure plate and the lower pressure plate. The wedge-shaped sealing unit is accommodated in a concave cavity formed between the lower pressure plate and the end face forming the liquid injection port, and the inner top surface of the concave cavity includes an inclined surface that can cooperate with the wedge block. The shaft rod passes upward through the upper pressure plate and the lower pressure plate and is slidably connected to the upper pressure plate up and down. There is an upper through hole on the upper pressure plate and a lower through hole on the lower pressure plate;

[0007] The driving unit can drive the upper pressure plate and the lower pressure plate to slide horizontally relative to each other to drive the wedge-shaped sealing unit to seal or open the liquid injection port.

[0008] Based on the above technical solution, the upper pressure plate and the lower pressure plate are designed as follows: when the driving unit drives the upper pressure plate and the lower pressure plate to slide horizontally relative to each other, the wedge block slides on the inclined surface, causing the sealing head to move up and down to open or seal the injection port; when the driving unit drives the upper pressure plate and the lower pressure plate to slide horizontally synchronously, the upper through hole and the lower through hole can be connected to the injection port to facilitate injection of liquid by external equipment.

[0009] On the basis of the above technical solution, the driving unit includes a driving cylinder and a second spring, and the driving cylinder can drive the lower pressure plate to slide back and forth horizontally. The first end of the second spring is fixedly arranged, and the second end of the second spring is connected to the upper pressure plate so that the upper pressure plate has a tendency to automatically reset. The upper pressure plate and the lower pressure plate are designed as follows: when the driving cylinder drives the lower pressure plate to displace in a first direction and the inclined surface slides relative to the wedge block, the sealing head moves up to open the liquid injection port; when the driving cylinder continues to displace in the first direction, the inner wall surface of the concave cavity abuts against the wedge-shaped sealing unit to make the upper pressure plate and the lower pressure plate displace synchronously; when the driving cylinder drives the lower pressure plate to displace in a second direction opposite to the first direction, the second spring drives the upper pressure plate to reset to its initial position; when the driving cylinder drives the lower pressure plate to continue to displace in the second direction, the inclined surface slides relative to the wedge block, and the sealing head moves down to seal the liquid injection port.

[0010] On the basis of the above technical solution, it also includes a fixed limit block, which can abut against the upper pressing plate to limit the upper pressing plate when the lower pressing plate moves along the second direction.

[0011] On the basis of the above technical solution, a first spring is provided on the outer sleeve of the length section of the shaft rod extending out of the upper pressure plate, and the first spring can provide a force to drive the shaft rod to slide upward.

[0012] On the basis of the above technical solution, the sealing head includes a sealing rubber that can contact the liquid injection port, and there are at least two inclined surfaces that are symmetrically arranged on both sides of the shaft.

[0013] Based on the above technical solution, a plurality of independent concave cavities are formed between the lower pressure plate and the end surface forming the liquid injection port, a plurality of wedge-shaped sealing units are arranged corresponding to the concave cavities one by one, and the lower through hole is arranged at intervals from the concave cavities.

[0014] On the basis of the above technical solution, it also includes a fixed plate, which is fitted downwardly with the upper pressure plate to limit the upper pressure plate from jumping up and down, and the fixed plate is provided with a third long hole for the shaft rod to pass through.

[0015] On the basis of the above technical solution, wear-resistant blocks are provided between the fixed plate and the upper pressing plate, between the upper pressing plate and the lower pressing plate, and between the lower pressing plate and the end surface forming the liquid injection port.

[0016] On the basis of the above technical solution, the wear-resistant block is embedded in a close fixing plate, an upper pressing plate, a lower pressing plate or an end panel forming a liquid injection port.

[0017] Beneficial Effects

[0018] The utility model has a reasonable structure.

[0019] The upper and lower pressure plates are designed as follows: through the horizontal sliding of the two, the up and down displacement of the wedge-shaped sealing unit can be realized to open or seal the injection port, and the upper through hole and the lower through hole can connect the injection port to facilitate the injection of the injection needle. This can not only reduce the activity of the sealing unit and make the structure more compact, but also reduce the probability of deformation of the upper and lower pressure plates due to uneven local force, which is conducive to improving the service life, making the seal firm, avoiding the situation where the seal fails due to excessive compression of the sealing head, and helping to improve the reliability of use. In addition, the fixed plate can limit the up and down jumping of the upper and lower pressure plates, and can provide opposite forces, further reducing the probability of deformation of the upper and lower pressure plates, which is conducive to improving the sealing quality.

[0020] The inclined surface and the wedge block cooperate to realize the upward and downward displacement of the sealing head in the present application, which has good stability, and the first spring outside the shaft rod can provide a force to drive the shaft rod to slide upward, so that the sealing head can flexibly abut against the edge of the sealing port, avoiding the problem of permanent deformation caused by hard contact between the sealing head and the injection port, which is beneficial to reducing the sealing failure rate and improving the service life. In addition, the present invention adopts a mechanical sealing structure to reduce the use of electrical components, which can not only improve the sealing quality but also help reduce the failure rate.

[0021] In the present application, the driving unit includes a driving cylinder and a second spring, wherein the driving cylinder is used to drive the lower pressure plate to slide back and forth horizontally. The upper pressure plate can be driven by the lower pressure plate when it is displaced in the first direction, and the upper pressure plate can be reset when it is displaced in the second direction under the action of the second spring. In addition, the setting of the limit block can limit the displacement of the upper pressure plate in the second direction, and the structural design is ingenious. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only one embodiment of the utility model. For ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0023] Figure 1 : Sealing structure in the prior art;

[0024] Figure 2 : A schematic diagram of the three-dimensional structure of the present invention;

[0025] Figure 3 : Perspective structural schematic diagram of the wedge-shaped sealing unit;

[0026] Figure 4 : Partial perspective structural schematic diagram of the lower pressing plate;

[0027] Figure 5 : Figure 2 Structural schematic diagram of the top view;

[0028] Figure 6 : Figure 5 Structural schematic diagram of the cross-section along the A-A direction in the middle;

[0029] Figure 7 : Figure 5 Structural schematic diagram of the cross-section along the B-B direction in the middle; Specific implementation manners

[0030] The following description and the accompanying drawings fully illustrate the specific implementation manners herein, enabling those skilled in the art to practice them. Parts and features of some implementation manners can be included in or replace parts and features of other implementation manners. The scope of the implementation manners herein includes the entire scope of the claims and all available equivalents of the claims. Herein, terms such as "first", "second", etc. are only used to distinguish one element from another element, and do not require or imply any actual relationship or order between these elements. In fact, the first element can also be called the second element, and vice versa. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, such that a structure, device or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such structure, device or equipment. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of another identical element in the structure, device or equipment including the said element. The various embodiments herein are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts among the various embodiments can be referred to each other.

[0031] As used herein, the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are 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. Therefore, it should not be construed as a limitation on the present invention. In the description of the present invention, unless otherwise specified and defined, the terms "mounted", "connected", and "coupled" shall be understood in a broad sense. For example, they can be mechanical connections or electrical connections, or the communication inside two elements. They can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0032] As used herein, unless otherwise specified, the term "plurality" means two or more.

[0033] As used herein, the character " / " indicates that the objects before and after are in an "or" relationship. For example, A / B means: A or B.

[0034] As used herein, the term "and / or" is an associative relationship describing an object, indicating that three relationships can exist. For example, A and / or B means: A or B, or, the three relationships of A and B.

[0035] As Figures 2 to 7 shown, a wedge-shaped sealing structure for a liquid injection cup includes a wedge-shaped sealing unit 1, a plate assembly, and a driving unit. As Figure 2 shown, the sealing structure is disposed above the cup body 100, and a liquid injection port 101 is formed on the top end surface of the cup body 100.

[0036] The wedge-shaped sealing unit 1 includes a sealing head 11, a wedge block 12, and a shaft rod 13 that are coaxially arranged. As Figure 3 shown, the sealing head 11 includes a sealing rubber that can abut against the liquid injection port 101. The sealing rubber is prior art and will not be elaborated herein. The sealing head 11 is used to seal the liquid injection port 101 and is connected to the wedge block 12 upward. The wedge block 12 is fixedly provided on the shaft rod 13. Specifically, the end of the shaft rod 13 passes downward through the wedge block 12 and is connected to the sealing head 11 to realize the fixed connection of the shaft rod 13, the wedge block 12, and the sealing head 11.

[0037] The plate assembly includes an upper pressing plate 2, a lower pressing plate 3, and a fixing plate 7 that are arranged in parallel and in contact. The fixing plate 7 is fixedly arranged, and the fixing plate 7, the upper pressing plate 2, and the lower pressing plate 3 are arranged in sequence from top to bottom. The fixing plate 7 is in contact with the upper pressing plate 2 downward to limit the up-and-down movement of the upper pressing plate 2, and the fixing plate 7 is provided with a third long hole 71 through which the shaft rod passes. Wear-resistant blocks (not shown) are provided between the fixing plate 7 and the upper pressing plate 2, between the upper pressing plate 2 and the lower pressing plate 3, and between the lower pressing plate 3 and the end face forming the liquid injection port 101. Specifically, the wear-resistant blocks are made of a high-molecular wear-resistant material, such as PEEK material. The high-molecular wear-resistant material or PEEK material is prior art, and those skilled in the art can select it according to requirements. In this embodiment, the wear-resistant blocks are strip-shaped and embedded in the upper pressing plate 2 and the lower pressing plate 3, so as to improve the sliding smoothness, which is beneficial to reducing the flatness requirements of the fixing plate 7, the upper pressing plate 2, the lower pressing plate 3, and the end face forming the liquid injection port 101 and simplifying the process.

[0038] As Figure 6 shown, a concave cavity 5 is formed between the lower pressing plate 2 and the end face forming the liquid injection port 101. There are multiple independent concave cavities 5. There are multiple wedge-shaped sealing units 1 and they are arranged in one-to-one correspondence with the concave cavities 5. The wedge-shaped sealing units 1 are accommodated in the concave cavities 5, and the inner top surface of the concave cavity 5 includes an inclined surface 31 that can cooperate with the wedge block 12. As Figure 4 shown, in this embodiment, there are two inclined surfaces 31 and they are symmetrically arranged on both sides of the shaft rod 13. In this way, the situation that the shaft rod 13 is flipped due to uneven force can be avoided, which is beneficial to improving the action smoothness of the wedge-shaped sealing unit 1.

[0039] As Figure 6 and 7 shown, the shaft rod 13 passes through the upper pressing plate 2 and the lower pressing plate 3 upward and is slidably connected with the upper pressing plate 2 up and down. As Figure 4 shown, a lower long hole is provided on the lower pressing plate 3. The shaft rod 13 passes through the long hole and can slide axially along the long hole. A connecting hole 22 is provided on the upper pressing plate 2. The shaft rod 13 passes through the connecting hole 22 and has a clearance fit with the connecting hole 22, that is, the shaft rod 13 can displace synchronously with the upper pressing plate 2. In addition, a first spring 14 is sleeved on the length section of the shaft rod 13 extending outside the upper pressing plate 2. A flange is provided at the top of the shaft rod 13. As Figure 3 or 7 shown, the two ends of the first spring 14 are respectively in contact with the flange and the upper pressing plate 2. The first spring 14 can provide a force to drive the shaft rod 13 to slide upward.

[0040] As Figure 6 shown, an upper through hole 21 is provided on the upper pressing plate 2, and a lower through hole 32 is provided on the lower pressing plate 3. The lower through hole 32 is spaced from the concave cavity 5. When the upper pressing plate 2 and the lower pressing plate 3 displace so that the upper through hole 21 and the lower through hole 32 are both communicated with the liquid injection port 101, the liquid injection needle can inject liquid into the liquid injection port 101.

[0041] In this embodiment, the driving unit includes a driving cylinder (not shown) and a second spring 4. In other embodiments of the present invention, the driving cylinder can be replaced by a hydraulic cylinder or an electric push rod. The driving cylinder is fixedly arranged, and the piston rod of the driving cylinder is connected to the lower pressing plate 3, which can drive the lower pressing plate 3 to reciprocate horizontally.

[0042] As Figure 3 shown, the first end of the second spring 4 is fixedly arranged on the fixing plate 7. The second spring 4 is inclined, and the second end of the second spring 4 is connected to the upper pressing plate 2 so that the upper pressing plate 2 has a tendency of automatic reset.

[0043] In addition, the upper pressing plate 2 and the lower pressing plate 3 in this application are designed such that when the driving cylinder drives the lower pressing plate 3 to displace in the first direction from the initial sealed state and the inclined surface 31 slides relative to the wedge block 12, the sealing head 11 moves upward to open the liquid injection port 101. During this process, the wedge block 12 approaches the inner wall surface of the inner cavity 5; when the driving cylinder drives the lower pressing plate 3 to continue to displace in the first direction, the inner wall surface of the concave cavity 5 abuts against the wedge block 12, so that the upper pressing plate 2 and the lower pressing plate 3 displace synchronously. At this time, the wedge-shaped sealing unit 1 moves away from the liquid injection port 101. When the upper through hole 21 and the lower through hole 32 are displaced to be coaxial with the liquid injection port 101, the lower pressing plate 3 stops displacing in the first direction; thus, it is convenient for the liquid injection needle to inject liquid into the liquid injection port 101.

[0044] The upper pressing plate 2 and the lower pressing plate 3 in this application are also designed such that when the driving cylinder drives the lower pressing plate 3 to displace in the second direction opposite to the first direction, under the action of the second spring 4, the upper pressing plate 2 resets to the initial position. It also includes a fixedly arranged limiting block 6. The limiting block 6 can abut against the upper pressing plate 2 to limit the upper pressing plate 2 when the lower pressing plate 3 displaces to the initial position along the second direction. Then, when the driving cylinder drives the lower pressing plate 3 to continue to displace in the second direction, the inclined surface 31 slides relative to the wedge block 12, and the sealing head 11 moves downward to seal the liquid injection port 101.

[0045] Working process

[0046] First, in the initial state, the wedge-shaped sealing unit 1 seals the liquid injection port 101. The driving cylinder drives the lower pressing plate 3 to displace in the first direction relative to the upper pressing plate 2, and the inclined surface 31 slides relative to the wedge block 12. At this time, the wedge block 12 gradually approaches the inner wall surface of the inner cavity 5. During the above process, the upper pressing plate 2 does not displace, and the wedge block 12 moves upward, thereby driving the sealing head 11 to move upward to open the liquid injection port 101;

[0047] After that, when the wedge block 12 abuts against the inner wall surface of the inner cavity 5, the wedge block 12 is displaced to the highest limit position. When the driving cylinder drives the lower pressing plate 3 to continue to displace in the first direction, the lower pressing plate 3 and the upper pressing plate 2 are displaced synchronously, so that the wedge-shaped sealing unit 1 is away from the liquid injection port 101, and the upper through hole 21 and the lower through hole 32 are close to the liquid injection port 101. The displacement stops when the upper through hole 21 and the lower through hole 32 are both communicated with the liquid injection port 101 and are coaxial;

[0048] After that, the liquid injection needle injects liquid into the liquid injection port 101;

[0049] After that, the driving cylinder drives the lower pressing plate 3 to displace in the second direction opposite to the first direction. Under the action of the second spring 4 and the frictional force between the lower pressing plate 3 and the upper pressing plate 2, the lower pressing plate 3 and the upper pressing plate 2 are first displaced synchronously. When reset to the initial position, the wedge-shaped sealing unit 1 is placed above the liquid injection port 101, and the upper through hole 21 and the lower through hole 32 both avoid the liquid injection port 101; and at this time, the upper pressing plate 2 abuts against the limit block 6 and is limited.

[0050] After that, the driving cylinder drives the lower pressing plate 3 to continue to displace in the second direction, and the upper pressing plate 2 is limited in the second direction. The inclined surface 31 slides relative to the wedge block 12, and the wedge block 12 slides downward, thereby driving the sealing head 11 to displace downward to seal the liquid injection port 101.

[0051] This cycle repeats.

[0052] The above has described the present invention by way of example, but the present invention is not limited to the above specific embodiments. Any modification or variation based on the present invention falls within the scope of protection required by the present invention.

Claims

1. A wedge-shaped sealing structure, characterized in that: It comprises a wedge-shaped sealing unit (1), a plate assembly and a driving unit; The wedge-shaped sealing unit (1) comprises a sealing head (11), a wedge-shaped block (12) and a shaft (13) which are coaxially arranged, the sealing head (11) being used to seal the liquid injection port (101) and being upwardly connected to the wedge-shaped block (12), and the wedge-shaped block (12) being fixedly arranged on the shaft (13); The plate assembly comprises an upper pressing plate (2) and a lower pressing plate (3) arranged in parallel, a wear-resistant block made of a polymer wear-resistant material is arranged between the upper pressing plate (2) and the lower pressing plate (3), the wedge-shaped sealing unit (1) is accommodated in a concave cavity (5) formed by the lower pressing plate (3) and the end surface forming the injection port (101), and the inner top surface of the concave cavity (5) comprises an inclined surface (31) that can cooperate with the wedge block (12), the shaft (13) passes upward through the upper pressing plate (2) and the lower pressing plate (3) and is slidably connected to the upper pressing plate (2) up and down, the upper pressing plate (2) is provided with an upper through hole (21), and the lower pressing plate (3) is provided with a lower through hole (32); The driving unit can drive the upper pressing plate (2) and the lower pressing plate (3) to slide horizontally relative to each other, so as to drive the wedge-shaped sealing unit (1) to seal or open the liquid injection port (101).

2. The wedge-shaped sealing structure according to claim 1, characterized in that: The upper pressing plate (2) and the lower pressing plate (3) are designed such that when the driving unit drives the upper pressing plate (2) and the lower pressing plate (3) to slide horizontally relative to each other, the wedge block (12) slides on the inclined surface (31), causing the sealing head (11) to move up and down to open or seal the injection port (101); when the driving unit drives the upper pressing plate (2) and the lower pressing plate (3) to slide horizontally synchronously, the upper through hole (21) and the lower through hole (32) can be connected to the injection port (101) to facilitate injection of liquid by external equipment.

3. The wedge-shaped sealing structure according to claim 1, characterized in that: The driving unit comprises a driving cylinder and a second spring (4), wherein the driving cylinder can drive the lower pressing plate (3) to slide back and forth horizontally, the first end of the second spring (4) is fixedly arranged, and the second end of the second spring (4) is connected to the upper pressing plate (2) so that the upper pressing plate (2) has a tendency to automatically reset, and the upper pressing plate (2) and the lower pressing plate (3) are designed such that when the driving cylinder drives the lower pressing plate (3) to move in a first direction and the inclined surface (31) slides relative to the wedge block (12), the sealing head (11) moves upward to open the liquid injection port (101). When the driving cylinder continues to move in the first direction, the inner wall surface of the concave cavity (5) abuts against the wedge-shaped sealing unit (1) to cause the upper pressure plate (2) and the lower pressure plate (3) to move synchronously; when the driving cylinder drives the lower pressure plate (3) to move in a second direction opposite to the first direction, the second spring (4) drives the upper pressure plate (2) to return to an initial position; when the driving cylinder drives the lower pressure plate (3) to continue to move in the second direction, the inclined surface (31) slides relative to the wedge block (12), and the sealing head (11) moves downward to seal the injection port (101).

4. The wedge-shaped sealing structure according to claim 3, characterized in that: It also comprises a fixedly arranged limit block (6), wherein the limit block (6) can abut against the upper pressing plate (2) to limit the position of the upper pressing plate (2) when the lower pressing plate (3) is displaced along the second direction.

5. The wedge-shaped sealing structure according to any one of claims 1 to 4, characterized in that: The length section of the shaft rod (13) extending outside the upper pressure plate (2) is covered with a first spring (14), and the first spring (14) can provide a force to drive the shaft rod (13) to slide upward.

6. The wedge-shaped sealing structure according to claim 5, characterized in that: The sealing head (11) comprises a sealing rubber capable of contacting the liquid injection port (101), and the inclined surfaces (31) are at least two and are symmetrically arranged on both sides of the shaft (13).

7. The wedge-shaped sealing structure according to claim 5, characterized in that: A plurality of independent concave cavities (5) are formed between the lower pressure plate (3) and the end surface forming the liquid injection port (101), the wedge-shaped sealing unit (1) has a plurality of concave cavities (5) arranged one-to-one with the concave cavities (5), and the lower through hole (32) is arranged at intervals from the concave cavities (5).

8. The wedge-shaped sealing structure according to claim 6 or 7, characterized in that: It also includes a fixedly arranged fixing plate (7), wherein the fixing plate (7) is fitted downwardly with the upper pressing plate (2) to limit the upper pressing plate (2) from bouncing up and down, and the fixing plate (7) is provided with a third long hole (71) for the shaft rod (13) to pass through.

9. The wedge-shaped sealing structure according to claim 8, characterized in that: Wear-resistant blocks are provided between the fixed plate (7) and the upper pressing plate (2), between the upper pressing plate (2) and the lower pressing plate (3), and between the lower pressing plate (3) and the end surface forming the liquid injection port (101).

10. The wedge-shaped sealing structure according to claim 9, characterized in that: The wear-resistant block is embedded in a nearby fixed plate (7), an upper pressing plate (2), a lower pressing plate (3) or an end plate forming a liquid injection port (101).

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