Connecting joint for plastic hose

Abstract

The utility model relates to the technical field of pipeline connecting devices, in particular to a connecting joint for a plastic hose, which comprises a body piece, a body connector arranged on a first side of the body piece and the plastic hose, and the plastic hose comprises a straight pipe section, an expansion section and a connecting section which are integrally formed. The end, close to the body piece, of the straight pipe section expands to form a connecting section matched with the body connector, and at least part of the connecting section is arranged on the body connector in a sleeving mode. The first side and the second side of the connecting piece are provided with a first port and a second port respectively, the connecting section penetrates through the first port, the straight pipe section penetrates through the second port, and the expansion section and the connecting section are sleeved with the connecting piece; the bracket is mounted between the body piece and the connecting piece; the sealing piece is installed on the support, and the sealing piece is extruded by the body piece and the connecting piece to generate elastic deformation; and the fixing piece is used for connecting the body piece and the connecting piece.

Description

Technical Field

[0001] The utility model relates to the technical field of pipeline connecting devices, in particular to a connecting joint for a plastic hose. Background Art

[0002] With the development of the semiconductor industry, corrosive liquids such as strippers, etching solutions, acids, and alkalis have become increasingly common. This has led to the emergence of a wide range of semiconductor equipment, including dilution, mixing, and transfer equipment. Each of these devices requires fittings that seal pipe connections, such as flares, beads, ferrules, VCRs, and flanges. However, currently, connecting plastic hoses (such as PFA tubing) to stainless steel pipes can only be achieved using ferrules, which can cause deformation and leakage in the PFA tubing. Utility Model Content

[0003] In view of the deficiencies in the prior art, the utility model provides a connecting joint for a plastic hose, aiming to solve the problem of deformation and leakage of a ferrule connection structure.

[0004] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0005] A connecting joint for a plastic hose, comprising:

[0006] A body member, wherein the body member is provided with a body interface on a first side,

[0007] A plastic hose comprising an integrally formed straight section, an expansion section, and a connecting section, wherein one end of the straight section close to the body member expands to form the connecting section that cooperates with the body interface, and the connecting section is at least partially sleeved on the body interface;

[0008] A coupling member, wherein the coupling member is provided with a first port and a second port on a first side and a second side respectively, the connecting section passes through the first port, the straight pipe section passes through the second port, and the coupling member is sleeved on the expansion section and the connecting section;

[0009] a bracket installed between the main body and the connecting member;

[0010] A sealing member, the sealing member being mounted on the bracket and elastically deformed by being squeezed by the main member and the connecting member;

[0011] A fixing member is used to connect the main body and the connecting member.

[0012] Furthermore, the main body includes: a stainless steel pipe welding portion, a plastic hose installation portion, a first fixed connection portion and a first bracket installation portion; the stainless steel pipe welding portion is used for welding with the stainless steel pipe, the outer diameter of the plastic hose installation portion matches the inner diameter of the connecting section, the connecting section is sleeved on the plastic hose installation portion, the first fixed connection portion cooperates with the fixing part to connect the connecting part, one side of the sealing part abuts against the first fixed connection portion, and the first bracket installation portion cooperates with the connecting part to install the bracket.

[0013] Furthermore, the plastic hose installation portion, the stainless steel pipe welding portion and the first fixed connection portion are integrally formed, the outer diameter of the plastic hose installation portion is larger than the outer diameter of the stainless steel pipe welding portion, the inner diameter of the plastic hose installation portion is equal to the inner diameter of the stainless steel pipe welding portion, the first fixed connection portion is arranged on the outside of the stainless steel pipe welding portion and extends toward the outside of the stainless steel pipe welding portion, and the first bracket installation portion is arranged at the first fixed connection portion.

[0014] Furthermore, the connecting part includes: a first plastic hose fixing part, a second plastic hose fixing part, a second fixed connection part and a second bracket mounting part; the inner diameter of the first plastic hose fixing part matches the outer diameter of the connecting section, the second plastic hose fixing part abuts the expansion section, the sealing part is arranged between the second fixed connection part and the first fixed connection part, the fixing part connects the second fixed connection part and the first fixed connection part, the second bracket mounting part and the first bracket mounting part are both grooves, and the bracket is mounted in the groove.

[0015] Furthermore, the first plastic hose fixing portion and the second plastic hose fixing portion are integrally formed, the second plastic hose fixing portion extends toward the inner side of the first plastic hose fixing portion, the first port is arranged at the first plastic hose fixing portion, and the second port is arranged at the second plastic hose fixing portion; the first plastic hose fixing portion is connected to the second fixed connection portion, and the second fixed connection portion extends toward the outer side of the first plastic hose fixing portion.

[0016] Furthermore, the bracket includes: a mounting portion and a connecting portion; the connecting portion is a circular ring structure, the mounting portion is circumferentially arranged on the connecting portion, a part of the connecting portion is installed on the first bracket mounting portion, and the other part of the connecting portion is installed on the second bracket mounting portion, the mounting portion is provided with a connecting groove, and the sealing member is clamped with the mounting portion through the connecting groove.

[0017] Furthermore, the fixing part includes: a clamp body, a connecting body and a fixed body, the clamp body is an annular structure, the clamp body includes a first end and a second end separated from each other, and both sides of the clamp body are provided with annular limiting edges protruding toward its center along its circumference, the first fixed connection part and the second fixed connection part are located between the limiting edges on both sides, the limiting edge on one side abuts against the first fixed connection part, and the limiting edge on the other side abuts against the second fixed connection part, the connecting body is connected to the first end of the clamp body, and the fixed body is connected to the connecting body to realize the connection between the first end and the second end.

[0018] Furthermore, the fixing member further comprises: a shaft connecting plate;

[0019] The clamp body includes a first clamp piece and a second clamp piece that are separated from each other;

[0020] The first clamping piece is semicircular, with one end of the first clamping piece being a first end and the other end being a third end; the first end is provided with a first connecting portion, and both sides of the first connecting portion are provided with first through-holes; the third end is provided with a third connecting portion, and both sides of the third connecting portion are provided with third through-holes;

[0021] The second clamping piece is semicircular, one end of the second clamping piece is a second end, and the other end is a fourth end; the second end is provided with a second connecting portion, and both sides of the second connecting portion are provided with second through holes; the fourth end is provided with a fourth connecting portion, and both sides of the fourth connecting portion are provided with fourth through holes;

[0022] The connecting body includes a rotating shaft rod and a connecting rod, wherein the rotating shaft rod and the connecting rod are fixedly connected to form a T-shaped structure, the rotating shaft rod is passed through the first through-hole, and at least a portion of the connecting rod is located between two second through-holes. The fixing body is threadedly connected to the connecting rod, and the fixing body abuts against the second connecting portion;

[0023] Rotating shafts are respectively provided at both ends of the shaft connecting plate, wherein the rotating shaft at one end is passed through the third through hole, and the rotating shaft at the other end is passed through the fourth through hole.

[0024] The utility model discloses a connecting joint for a plastic hose, which has the following beneficial effects:

[0025] By sleeveing the connecting section of the plastic hose on the main body interface, and passing the connecting section through the first port and the straight pipe section through the second port, the connecting piece is sleeved on the expansion section and the connecting section, so that the main body and the connecting piece clamp the plastic hose from the inside and outside of the expansion section and the connecting section of the plastic hose respectively, which will not cause the plastic hose to deform, thereby avoiding leakage problems. At the same time, the main body and the fixing piece are connected by the fixing piece to fix the position between the main body and the fixing piece. In order to enable better assembly between the main body and the fixing piece, a bracket is set between the main body and the connecting piece, and a sealing piece is installed on the bracket. The sealing piece is elastically deformed by the squeezing of the main body and the connecting piece, thereby improving the sealing between the main body and the connecting piece. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the three-dimensional structure of a connecting joint for a plastic hose according to an embodiment of the present utility model;

[0027] Figure 2 This is a schematic cross-sectional view of a connecting joint for a plastic hose according to an embodiment of the present invention;

[0028] Figure 3 This is a schematic perspective cross-sectional view of a connecting joint for a plastic hose according to an embodiment of the present utility model;

[0029] Figure 4 It is a schematic diagram of the disassembly of the structure of a connecting joint for a plastic hose according to an embodiment of the present utility model.

[0030] Description of reference numerals:

[0031] 1. Main body; 11. Stainless steel pipe welding part; 12. Plastic hose installation part; 13. First fixed connection part; 14. First bracket installation part; 2. Plastic hose; 21. Straight pipe section; 22. Expansion section; 23. Connecting section; 3. Connecting piece; 31. First plastic hose fixing part; 32. Second plastic hose fixing part; 33. Second fixed connection part; 34. Second bracket installation part; 4. Bracket; 41. Installation part; 42. Connecting part; 5. Sealing piece; 6. Fixing piece; 61. Clamp body; 611. Limiting edge; 612. First clamp piece; 613. Second clamp piece; 614. First connecting part; 615. Second connecting part; 616. Third connecting part; 617. Fourth connecting part; 62. Connecting body; 621. Rotating shaft rod; 622. Connecting rod; 63. Fixing body. DETAILED DESCRIPTION

[0032] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0033] like Figures 1 to 4As shown, the present application provides a connecting joint for a plastic hose 2, comprising:

[0034] The main body 1 is provided with a main body interface on the first side.

[0035] The plastic hose 2 includes an integrally formed straight tube section 21, an expansion section 22, and a connecting section 23. The straight tube section 21 is expanded at one end close to the body 1 to form a connecting section 23 that cooperates with the body interface. The connecting section 23 is at least partially sleeved on the body interface.

[0036] The connector 3 is provided with a first port and a second port on the first side and the second side respectively. The connecting section 23 passes through the first port, and the straight pipe section 21 passes through the second port. The connector 3 is sleeved on the expansion section 22 and the connecting section 23;

[0037] Bracket 4, bracket 4 is installed between the main body 1 and the connecting member 3;

[0038] The sealing member 5 is mounted on the bracket 4 and is elastically deformed by the compression of the main body 1 and the connecting member 3;

[0039] The fixing member 6 is used to connect the main body 1 and the connecting member 3.

[0040] By sleeveing the connecting section 23 of the plastic hose 2 on the main body interface, and passing the connecting section 23 through the first port and the straight pipe section 21 through the second port, the connecting member 3 is sleeved on the expansion section 22 and the connecting section 23, so that the main body 1 and the connecting member 3 respectively clamp the plastic hose 2 from the inside and outside of the expansion section 22 and the connecting section 23 of the plastic hose 2, which will not cause the plastic hose 2 to deform, thereby avoiding leakage problems. At the same time, the main body 1 and the fixing member 6 are connected by the fixing member 6 to fix the position between the main body 1 and the fixing member 6. In order to enable better assembly between the main body 1 and the fixing member 6, a bracket 4 is set between the main body 1 and the connecting member 3, and a sealing member 5 is installed on the bracket 4. The sealing member 5 is elastically deformed by the squeezing of the main body 1 and the connecting member 3, thereby improving the sealing between the main body 1 and the connecting member 3.

[0041] like Figures 1 to 4 As shown, in some embodiments, the main body 1 includes: a stainless steel pipe welding portion 11, a plastic hose 2 mounting portion 41, a first fixed connection portion 42 and a first bracket 4 mounting portion 41; the stainless steel pipe welding portion 11 is used for welding with the stainless steel pipe, the outer diameter of the plastic hose 2 mounting portion 41 matches the inner diameter of the connecting section 23, the connecting section 23 is sleeved on the plastic hose 2 mounting portion 41, the first fixed connection portion 42 cooperates with the fixing part 6 to connect the connecting part 3, one side of the sealing part 5 abuts against the first fixed connection portion 42, and the first bracket 4 mounting portion 41 cooperates with the connecting part 3 to install the bracket 4.

[0042] The main body 1 is welded to the stainless steel pipe through the stainless steel pipe welding part 11, docked with the plastic hose 2 through the plastic hose 2 mounting part 41, and fixed to the fixing part 6 at the same time as the connecting part 3 through the first fixed connection part 42, so that the plastic hose 2 is fixed between the main body 1 and the connecting part 3, and the fixing part 6 and the sealing part 5 are installed in cooperation with the connecting part 3 through the mounting part 41 of the first bracket 4.

[0043] like Figures 1 to 4 As shown, in some embodiments, the mounting portion 41 of the plastic hose 2, the stainless steel pipe welding portion 11 and the first fixed connection portion 42 are integrally formed, the outer diameter of the mounting portion 41 of the plastic hose 2 is larger than the outer diameter of the stainless steel pipe welding portion 11, the inner diameter of the mounting portion 41 of the plastic hose 2 is equal to the inner diameter of the stainless steel pipe welding portion 11, the first fixed connection portion 42 is arranged on the outside of the stainless steel pipe welding portion 11 and extends toward the outside of the stainless steel pipe welding portion 11, and the mounting portion 41 of the first bracket 4 is arranged at the first fixed connection portion 42.

[0044] As shown in the figure, in some embodiments, the connecting part 3 includes: a first plastic hose 2 fixing part, a second plastic hose 2 fixing part, a second fixed connection part 42 and a second bracket 4 mounting part 41; the inner diameter of the first plastic hose 2 fixing part matches the outer diameter of the connecting section 23, the second plastic hose 2 fixing part abuts the expansion section 22, the sealing part 5 is arranged between the second fixed connection part 42 and the first fixed connection part 42, the fixing part 6 connects the second fixed connection part 42 and the first fixed connection part 42, the second bracket 4 mounting part 41 and the first bracket 4 mounting part 41 are both grooves, and the bracket 4 is installed in the groove.

[0045] The connecting member 3 clamps the plastic hose 2 from the outside and inside of the connecting section 23 through the inner side of the first plastic hose 2 fixing part and the outer side of the plastic hose 2 mounting part 41 of the main body 1, and clamps the plastic hose 2 from the outside and inside of the expansion section 22 through the inner side of the geothermal plastic hose 2 fixing part and the main body interface end of the plastic hose 2 mounting part 41, thereby limiting the position of the plastic hose 2. At the same time, the second fixed connection part 42 and the first fixed connection part 42 are fixed by the fixing member 6, thereby ensuring that the relative position between the connecting member 3 and the main body 1 is fixed, and the bracket 4 is fixed between the main body 1 and the connecting member 3 by the second bracket 4 mounting part 41 and the first bracket 4 mounting part 41.

[0046] like Figures 1 to 4As shown, in some embodiments, the fixing portion of the first plastic hose 2 and the fixing portion of the second plastic hose 2 are integrally formed, the fixing portion of the second plastic hose 2 extends toward the inner side of the fixing portion of the first plastic hose 2, the first port is provided at the fixing portion of the first plastic hose 2, and the second port is provided at the fixing portion of the second plastic hose 2; the fixing portion of the first plastic hose 2 is connected to the second fixed connection portion 42, and the second fixed connection portion 42 extends toward the outer side of the fixing portion of the first plastic hose 2.

[0047] First, the first port of the connector 3 is passed through the straight pipe section 21, the expansion section 22 and the connecting section 23 of the plastic hose 2 in sequence, so that the connector 3 is sleeved on the plastic hose 2. After the connector 3 is sleeved on the plastic hose 2, the connecting section 23 passes through the first port and the straight pipe section 21 passes through the second port. Since the fixed part of the second plastic hose 2 extends toward the inside of the fixed part of the first plastic hose 2, after the second fixed connection part 42 and the first fixed connection part 42 are fixed in position by the fixing member 6, the fixed part of the second plastic hose 2 and the installation part 41 of the plastic hose 2 respectively abut the expansion section 22 from the outside and the inside, thereby connecting the plastic hose 2 to the connecting joint.

[0048] like Figures 1 to 4 As shown, in some embodiments, the bracket 4 includes: a mounting portion 41 and a connecting portion 42; the connecting portion 42 is a circular ring structure, the mounting portion 41 is circumferentially arranged on the connecting portion 42, a part of the connecting portion 42 is installed on the mounting portion 41 of the first bracket 4, and the other part of the connecting portion 42 is installed on the mounting portion 41 of the second bracket 4, and the mounting portion 41 is provided with a connecting groove, and the seal 5 is clamped with the mounting portion 41 through the connecting groove.

[0049] The mounting portion 41 is arranged on the outside of the connecting portion 42, so the sealing member 5 is arranged on the outside of the bracket 4. If liquid leaks between the main body 1 and the plastic hose 2, the connecting portion 42 of the bracket 4 can prevent the liquid leaked between the main body 1 and the plastic hose 2 from continuing to spread toward the sealing member 5, thereby extending the service life of the sealing member 5. When the liquid passes through the connecting portion 42 of the bracket 4, it can be blocked by the sealing member 5, thereby preventing the liquid from leaking from the connecting joint.

[0050] It should be noted that the sealing member 5 is an annular sealing ring, so that it can be sleeved on the connecting notch of the mounting portion 41 and achieve a snap connection with the mounting portion 41 through the connecting notch.

[0051] like Figures 1 to 4As shown, in some embodiments, the fixing member 6 includes: a clamp body 61, a connecting body 62 and a fixing body 63. The clamp body 61 is an annular structure. The clamp body 61 includes a first end and a second end separated from each other. Both sides of the clamp body 61 are provided with annular limiting edges 611 protruding toward the center thereof along its circumference. The first fixed connection part 42 and the second fixed connection part 42 are located between the limiting edges 611 on both sides, wherein the limiting edge 611 on one side abuts against the first fixed connection part 42, and the limiting edge 611 on the other side abuts against the second fixed connection part 42. The connecting body 62 is connected to the first end of the clamp body 61, and the fixing body 63 is connected to the connecting body 62 to realize the connection between the first end and the second end.

[0052] The first fixed connection part 42 and the second fixed connection part 42 are fixed by the limiting edges 611 on both sides of the clamp body 61, and the connecting body 62 connected to the first end of the clamp body 61 is connected to the fixed body 63, thereby realizing the connection between the first end and the second end that are separated from each other.

[0053] like Figure 4 As shown, in some embodiments, the fixing member 6 further includes: a shaft connecting plate;

[0054] The clamp body 61 includes a first clamp piece 612 and a second clamp piece 613 that are separated from each other;

[0055] The first clamping piece 612 is semicircular, with one end of the first clamping piece 612 being a first end and the other end being a third end. The first end is provided with a first connecting portion 614, and both sides of the first connecting portion 614 are provided with first through-holes. The third end is provided with a third connecting portion 616, and both sides of the third connecting portion 616 are provided with third through-holes.

[0056] The second clamping piece 613 is semicircular, with one end of the second clamping piece 613 being the second end and the other end being the fourth end. The second end is provided with a second connecting portion 615, and second through-holes are provided on both sides of the second connecting portion 615. The fourth end is provided with a fourth connecting portion 617, and fourth through-holes are provided on both sides of the fourth connecting portion 617.

[0057] The connecting body 62 includes a rotating shaft 621 and a connecting rod 622 . The rotating shaft 621 and the connecting rod 622 are fixedly connected to form a T-shaped structure. The rotating shaft 621 is inserted into the first through-hole, and at least a portion of the connecting rod 622 is located between the two second through-holes. The fixing body 63 is threadedly connected to the connecting rod 622 , and the fixing body 63 abuts the second connecting portion 615 .

[0058] Rotating shafts are respectively provided at both ends of the shaft connecting plate, wherein the rotating shaft at one end is passed through the third through hole, and the rotating shaft at the other end is passed through the fourth through hole.

[0059] The above description is merely a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any minor modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A connecting joint for a plastic hose, characterized in that: include: A body member, wherein the body member is provided with a body interface on a first side, A plastic hose comprising an integrally formed straight section, an expansion section, and a connecting section, wherein one end of the straight section close to the body member expands to form the connecting section that cooperates with the body interface, and the connecting section is at least partially sleeved on the body interface; A coupling member, wherein the coupling member is provided with a first port and a second port on a first side and a second side respectively, the connecting section passes through the first port, the straight pipe section passes through the second port, and the coupling member is sleeved on the expansion section and the connecting section; a bracket installed between the main body and the connecting member; A sealing member, the sealing member being mounted on the bracket and elastically deformed by being squeezed by the main member and the connecting member; A fixing member is used to connect the main body and the connecting member.

2. The connecting joint for a plastic hose according to claim 1, characterized in that: The main body includes: a stainless steel pipe welding part, a plastic hose installation part, a first fixed connection part and a first bracket installation part; the stainless steel pipe welding part is used to weld with the stainless steel pipe, the outer diameter of the plastic hose installation part matches the inner diameter of the connecting section, the connecting section is sleeved on the plastic hose installation part, the first fixed connection part cooperates with the fixing part to connect the connecting part, one side of the sealing part abuts against the first fixed connection part, and the first bracket installation part cooperates with the connecting part to install the bracket.

3. The connecting joint for a plastic hose according to claim 2, characterized in that: The plastic hose mounting portion, the stainless steel pipe welding portion and the first fixed connection portion are integrally formed, the outer diameter of the plastic hose mounting portion is larger than the outer diameter of the stainless steel pipe welding portion, the inner diameter of the plastic hose mounting portion is equal to the inner diameter of the stainless steel pipe welding portion, the first fixed connection portion is arranged on the outside of the stainless steel pipe welding portion and extends toward the outside of the stainless steel pipe welding portion, and the first bracket mounting portion is arranged at the first fixed connection portion.

4. The connecting joint for a plastic hose according to claim 2, characterized in that: The connecting part includes: a first plastic hose fixing part, a second plastic hose fixing part, a second fixed connection part and a second bracket mounting part; the inner diameter of the first plastic hose fixing part matches the outer diameter of the connecting section, the second plastic hose fixing part abuts the expansion section, the sealing part is arranged between the second fixed connection part and the first fixed connection part, the fixing part connects the second fixed connection part and the first fixed connection part, the second bracket mounting part and the first bracket mounting part are both grooves, and the bracket is mounted in the groove.

5. The connecting joint for a plastic hose according to claim 4, characterized in that: The first plastic hose fixing portion and the second plastic hose fixing portion are integrally formed, the second plastic hose fixing portion extends toward the inner side of the first plastic hose fixing portion, the first port is provided at the first plastic hose fixing portion, and the second port is provided at the second plastic hose fixing portion; the first plastic hose fixing portion is connected to the second fixed connection portion, and the second fixed connection portion extends toward the outer side of the first plastic hose fixing portion.

6. The connecting joint for a plastic hose according to claim 4, characterized in that: The bracket includes: a mounting portion and a connecting portion; the connecting portion is a circular ring structure, the mounting portion is circumferentially arranged on the connecting portion, a part of the connecting portion is installed on the first bracket mounting portion, and the other part of the connecting portion is installed on the second bracket mounting portion, the mounting portion is provided with a connecting notch, and the sealing member is clamped with the mounting portion through the connecting notch.

7. The connecting joint for a plastic hose according to claim 4, characterized in that: The fixing part includes: a clamp body, a connecting body and a fixing body. The clamp body is an annular structure. The clamp body includes a first end and a second end separated from each other. Both sides of the clamp body are provided with annular limiting edges protruding toward the center thereof along its circumference. The first fixed connection part and the second fixed connection part are located between the limiting edges on both sides, wherein the limiting edge on one side abuts against the first fixed connection part, and the limiting edge on the other side abuts against the second fixed connection part. The connecting body is connected to the first end of the clamp body, and the fixing body is connected to the connecting body to realize the connection between the first end and the second end.

8. The connecting joint for a plastic hose according to claim 7, characterized in that: The fixing member further comprises: a shaft connecting plate; The clamp body includes a first clamp piece and a second clamp piece that are separated from each other; The first clamping piece is semicircular, with one end of the first clamping piece being a first end and the other end being a third end; the first end is provided with a first connecting portion, and both sides of the first connecting portion are provided with first through-holes; the third end is provided with a third connecting portion, and both sides of the third connecting portion are provided with third through-holes; The second clamping piece is semicircular, one end of the second clamping piece is a second end, and the other end is a fourth end; the second end is provided with a second connecting portion, and both sides of the second connecting portion are provided with second through holes; the fourth end is provided with a fourth connecting portion, and both sides of the fourth connecting portion are provided with fourth through holes; The connecting body includes a rotating shaft rod and a connecting rod, wherein the rotating shaft rod and the connecting rod are fixedly connected to form a T-shaped structure, the rotating shaft rod is passed through the first through-hole, and at least a portion of the connecting rod is located between two second through-holes. The fixing body is threadedly connected to the connecting rod, and the fixing body abuts against the second connecting portion; Rotating shafts are respectively provided at both ends of the shaft connecting plate, wherein the rotating shaft at one end is passed through the third through hole, and the rotating shaft at the other end is passed through the fourth through hole.

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