Spinneret orifice module assembly capable of being replaced and mounted quickly

Abstract

The utility model discloses a spinneret orifice module assembly capable of being rapidly replaced and installed, and belongs to the technical field of textile equipment. Comprising a die head, a delivery gap, a sealing structure and a spinneret plate, the lower end face of the die head is of an opening structure. A delivery notch is formed in the side wall, close to the lower portion, of the die head. The spinneret plate is mounted in the die head from the delivery notch, or the spinneret plate is dismounted from the die head from the delivery notch; a sealing structure is arranged on the side wall of the die head; and the sealing structure is used for sealing the delivery gap. The utility model solves the problem that the whole die head needs to be detached from equipment if the spinneret plate needs to be replaced in the spinning production process at present.

Description

Technical Field

[0001] The utility model belongs to the technical field of textile equipment, and particularly relates to a quick-changing spinneret hole module assembly. Background Art

[0002] The melt spinning method is a spinning method in which a fusible resin is heated and melted, extruded through a spinneret at a certain speed in air or water, and cooled and solidified into fibers. The spinneret is usually detachably arranged in the spinneret die head; during use, the die head equipped with the spinneret is installed on the spinning equipment and connected to the discharge port of the screw extruder through a connecting device. A number of spinneret holes with tiny apertures are arranged on the spinneret, and according to the required diameter of the spun fiber, a suitable model of spinneret is replaced for spinning.

[0003] In addition to installing a suitable spinneret in the die head before production, during the production process, if there is a large-area blockage in the spinneret holes on the spinneret, or if it is necessary to replace another model of spinneret during production to produce filamentous fibers with different outer diameters; the spinneret needs to be replaced; currently, for the installation method of the spinneret and the die head, when replacing the spinneret, the entire die head needs to be removed from the equipment, and after replacing the spinneret, it needs to be reinstalled on the spinning equipment as a whole; the entire process of replacing the spinneret is very cumbersome, especially during the production process, the surface temperature of the die head is relatively high, making it even more difficult to operate; it takes a long time. Summary of the Utility Model

[0004] A quick-changing spinneret hole module assembly provided by the utility model has a notch opened at the lower part of the die head, and the spinneret can be directly delivered into the die head through this notch, and then the notch is sealed by a notch sealing structure arranged on the die head; the whole die head is installed on the spinning equipment to carry out spinning production. When it is necessary to replace the spinneret, the notch sealing structure is opened, the old spinneret is taken out from the notch, then a new spinneret is replaced, and then the notch sealing structure is closed. The replacement of the spinneret does not require the entire die head to be removed from the equipment, realizing quick replacement. The utility model solves the problem that in the current spinning production process, if the spinneret needs to be replaced, the entire die head needs to be removed from the equipment.

[0005] In order to achieve the above technical purpose, the utility model is realized through the following technical solutions:

[0006] A quick-changing spinneret hole module assembly includes: a die head, a delivery notch, a sealing structure, and a spinneret;

[0007] The lower end face of the die head is set as an open structure;

[0008] A delivery notch is formed on the side wall of the die head near the lower part; the spinneret plate is installed into the die head through the delivery notch, or the spinneret plate is removed from the die head through the delivery notch.

[0009] A sealing structure is arranged on the side wall of the die head; the sealing structure is used to seal the delivery notch.

[0010] Preferably, the perimeter of the delivery notch is equal to 1 / 2 of the outer perimeter of the die head.

[0011] Preferably, the sealing structure includes: a sealing arc plate, a bolt rod and a nut;

[0012] One side of each of the two side edges of the delivery notch is hinged to the first side of a sealing arc plate.

[0013] An attachment plate is arranged on the second side of the sealing arc plate;

[0014] After the sealing arc plate closes the delivery notch tightly, the two attachment plates are attached to each other;

[0015] The bolt rod is passed through the two attachment plates; nuts are arranged at both ends of the bolt rod;

[0016] The nuts are screwed, and the two sealing arc plates are butted by the bolt rod to seal the delivery notch.

[0017] Preferably, a grooving is formed on the side wall of the spinneret plate;

[0018] The grooving facilitates the removal of the spinneret plate from the die head and also facilitates holding the spinneret plate to install it into the die head.

[0019] Preferably, a filter plate is detachably arranged in the die head; a discharge pipe is arranged below the filter plate; the filtered spinning raw material flows out from the discharge pipe;

[0020] The filter plate is used to filter the spinning raw material.

[0021] Preferably, a pressing plate is arranged below the filter plate;

[0022] The pressing plate is movably arranged in the die head; and the side wall of the pressing plate is attached to the inner wall of the die head;

[0023] The discharge pipe passes through the pressing plate, and the outlet of the discharge pipe is located below the pressing plate.

[0024] The pressing plate is used to pressurize the spinning raw material so that it sprays out from the spinneret holes on the spinneret plate to form filamentous fibers.

[0025] Preferably, a side wall arc plate is arranged above the filter plate;

[0026] An upper cover plate is arranged on the upper end opening of the side wall arc plate;

[0027] A feed pipe is arranged on the upper cover plate;

[0028] Screw holes are formed on the side wall of the upper cover plate; screw holes are also formed on the side wall close to the opening edge at the upper end of the die head;

[0029] The upper cover plate, the side wall arc plate and the filter plate are jointly arranged in the die head; the screw holes on the upper cover plate are aligned with the screw holes on the die head, and screws are arranged in the screw holes; the upper cover plate, the side wall arc plate and the filter plate are installed in the die head.

[0030] Preferably, the inside of the filter plate is arranged as a hollow structure;

[0031] The panel above the hollow structure is arranged as a filter hole plate with filter holes;

[0032] The panel below the hollow structure is arranged as a lower bottom plate, and a discharge pipe is centrally arranged on the lower bottom plate;

[0033] After the spinning raw material is filtered by the filter hole plate, it passes through the hollow structure and finally flows out from the discharge pipe.

[0034] Preferably, a circular through hole is centrally formed on the pressing plate, the discharge pipe passes through the pressing plate from the circular through hole, the outer wall of the discharge pipe is attached to the inner wall of the circular through hole, and the discharge pipe does not prevent the pressing plate from moving up and down in the die head;

[0035] Two sliding blocks are arranged on the opposite sides of the side wall of the pressing plate;

[0036] Moving sliding grooves are symmetrically formed on the inner wall of the die head;

[0037] The sliding blocks are movably embedded in the moving sliding grooves; the sliding blocks slide up and down in the moving sliding grooves, that is, the up and down movement of the pressing plate in the die head is realized.

[0038] Preferably, an elastic member is arranged between the upper end of the sliding block and the upper end of the moving sliding groove;

[0039] After the pressing plate moves down, under the action of the elastic member, it can automatically move up and return to its original position.

[0040] Preferably, two pressurizing air pipe joints are arranged on the opposite sides of the side wall of the die head;

[0041] One end of the pressurizing air pipe joint is communicated with the inside of the die head, and the other end is communicated with the outside;

[0042] The end of the pressurizing air pipe joint communicated with the outside is connected to an air pump.

[0043] The beneficial effects of the utility model are:

[0044] A quick-change spinneret hole module assembly provided by the present utility model. A delivery notch is opened on the side wall below the die head of the assembly, and an openable and closable sealing arc plate is arranged on the delivery notch for sealing. After the sealing arc plate is opened, the spinneret plate can be installed in the die head from the delivery notch. Similarly, the spinneret plate can be disassembled from the die head from the delivery notch. If the spinneret plate needs to be replaced during the production process, there is no need to disassemble the entire die head. The spinneret plate can be directly disassembled, replaced and installed from the delivery notch on the die head. The operation process is simple and fast.

[0045] A notch is opened on the side wall of the spinneret plate. When disassembling or installing, fingers hold inside the notch, which is convenient for holding the spinneret plate for disassembly or replacement.

[0046] A pressing plate is arranged inside the die head, and the pressing plate is arranged between the filter plate and the spinneret plate. Gas is introduced into the die head through a pressurized air pipe joint to pressurize the pressing plate. The pressing plate pressurizes the spinning raw material below, so that it uniformly sprays out from the spinneret holes on the spinneret plate. By pressurizing with the pressing plate, it helps the spinning raw material to spray out uniform filamentous fibers. Description of the Drawings

[0047] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0048] Figure 1 It is a schematic diagram of the overall structure of the die head of the present utility model;

[0049] Figure 2 It is a schematic diagram of the delivery notch structure opened on the die head of the present utility model;

[0050] Figure 3 It is a schematic diagram of installing the spinneret plate in the die head from the delivery notch of the present utility model;

[0051] Figure 4 It is a schematic diagram of the sealing arc plate arranged at the delivery notch of the present utility model;

[0052] Figure 5 It is a schematic diagram of the notch structure arranged on the spinneret plate of the present utility model;

[0053] Figure 6 It is a schematic diagram of the side wall arc plate and the upper cover plate arranged on the filter plate of the present utility model; and a schematic diagram of the feed pipe arranged on the upper cover plate and the discharge pipe arranged below the filter plate;

[0054] Figure 7It is a schematic structural diagram of the filter hole plate arranged above the filter plate of the present utility model;

[0055] Figure 8 It is a schematic structural diagram of the filter plate of the present utility model, specifically the filter hole plate above, the hollow structure and the schematic structural diagram of the lower bottom plate below;

[0056] Figure 9 It is the positional relationship among the filter plate, the pressing plate and the spinneret plate arranged in the die head of the present utility model;

[0057] Figure 10 It is the partial enlarged schematic diagram A of the present utility model;

[0058] Figure 11 It is a schematic structural diagram of the elastic member arranged between the upper end of the slider and the upper end of the moving chute in the partial enlarged schematic diagram A.

[0059] In the attached drawings, the structural names represented by each reference numeral are as follows:

[0060] 1 - Die head, 101 - Delivery notch, 102 - Sealing arc plate, 1021 - Attachment plate, 103 - Moving chute, 2 - Spinneret plate, 201 - Scooping groove, 3 - Filter plate, 301 - Filter hole plate, 302 - Lower bottom plate, 4 - Upper cover plate, 401 - Screw hole, 5 - Side wall arc plate, 6 - Feed pipe, 7 - Discharge pipe, 8 - Pressing plate, 801 - Slider, 802 - Elastic member, 9 - Booster air pipe joint. Specific embodiments

[0061] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

[0062] Embodiment 1

[0063] A quick-change spinneret hole module assembly includes: a die head 1, a delivery notch 101, a sealing structure, and a spinneret plate 2;

[0064] The die head 1 is provided with an installation structure, and the die head 1 can be integrally installed on the spinning equipment; this installation structure is the same as the installation structure on the existing die head 1, so it will not be described in detail.

[0065] The die head 1 is set as a cylindrical structure, and both the upper and lower ends of the die head 1 are set as open structures; the installation position of the spinneret plate 2 is set near the lower end of the die head 1. The spinning raw material enters the die head 1 and flows out as filamentous fibers from below the die head 1; a number of spinneret holes with tiny apertures are opened on the spinneret plate 2, and the spinning raw material passes through the spinneret holes to form filamentous fibers.

[0066] As Figure 2 described, a delivery notch 101 is opened on the side wall near the lower part of the die head 1. The width of the delivery notch 101 is slightly larger than the thickness of the spinneret plate 2, so that the spinneret plate 2 can be smoothly fed into the die head 1 through the delivery notch 101 or disassembled from the die head 1.

[0067] As Figure 4 shown, in order for the spinneret plate 2 to pass through the delivery notch 101, the opening perimeter of the delivery notch 101 should be at least equal to 1 / 2 of the outer wall perimeter of the die head 1. Only in this way does the delivery notch 101 have enough open range to put the spinneret plate 2 into the die head 1 through the delivery notch 101 or take it out from the die head 1. If the opening perimeter at the delivery notch 101 is greater than 1 / 2 of the outer wall perimeter of the die head 1, the connection stability of the part below the delivery notch 101 will be affected. Therefore, it is optimal to set the opening perimeter of the delivery notch 101 to 1 / 2 of the outer wall perimeter of the die head 1.

[0068] When the spinneret plate 2 is put into the die head 1 through the delivery notch 101, a sealing structure needs to be set at the delivery notch 101 for sealing; to ensure the installation stability of the spinneret plate 2.

[0069] As Figure 4 shown, the above-mentioned sealing structure includes: a sealing arc plate 102, a bolt rod and a nut;

[0070] One side of the first edge of a sealing arc plate 102 is hinged to each of the two side edges of the delivery notch 101; an attachment plate 1021 is arranged on the second edge of the sealing arc plate 102; the radian of the sealing arc plate 102 is adapted to the radian of the outer wall of the die head 1. When the sealing arc plate 102 is attached to the outer wall of the die head 1, it can just close the delivery notch 101;

[0071] After the sealing arc plate 102 closes the delivery notch 101 tightly, the two attachment plates 1021 are attached to each other; bolt holes are opened on the attachment plates 1021; the bolt rod is passed through the two attachment plates 1021; and nuts are arranged at both ends of the bolt rod;

[0072] Turn the nut in the direction close to the attachment plate 1021, and use the nut and the bolt rod to butt the two sealing arc plates 102 and seal the delivery notch 101.

[0073] Remove the nut and the bolt rod, open the sealing arc plate 102, and the delivery notch 101 can be opened; then the spinneret 2 can be taken out from the die head 1.

[0074] As a preferred embodiment, since the side wall of the spinneret 2 is an arc structure and the side wall of the spinneret 2 is relatively smooth; the spinneret 2 is located in the die head 1, which is not convenient to hold the spinneret 2 and take it out from the die head 1.

[0075] As Figure 5 shown, two digging grooves 201 are opened on the side wall of the spinneret 2; when installing the spinneret 2, the digging groove 201 is facing the delivery notch 101; by holding the hand in the digging groove 201, the spinneret 2 can be held and taken out from the die head 1.

[0076] Embodiment 2

[0077] Based on Embodiment 1, in Embodiment 1, after the molten spinning raw material enters the die head 1, it passes through the spinneret 2 and forms filamentous fibers for output; however, there may be impurity particles or incompletely molten particulate matter in the molten spinning raw material, and these particulate matters are likely to block the spinneret holes on the spinneret 2, affecting the formation of filamentous fibers by the spinneret 2.

[0078] Therefore, in this embodiment, a filter plate is provided near the upper opening of the die head 1, and the spinning raw material entering the die head 1 through the screw extruder and the metering pump needs to pass through the filter plate first. The large particulate matter in the spinning raw material is filtered out by the filter plate, and then the raw material passes through the spinneret 2 to form filamentous fibers.

[0079] Filtering out the large particulate matter can prevent these particulate matters from blocking the spinneret holes on the spinneret 2 and affecting the normal use of the spinneret 2.

[0080] Embodiment 3

[0081] Based on Embodiment 2, in Embodiment 2, the spinning raw material flows out from the spinneret holes of the spinneret 2 in a natural flow manner to form filamentous fibers; in this way, the efficiency of the filamentous fibers ejected by the spinneret 2 is too low, and there may be a situation where the formed filamentous fibers are uneven.

[0082] As Figure 9 shown, in this embodiment, a pressing plate 8 is provided between the filter plate and the spinneret 2; the pressing plate 8 is movably arranged up and down in the die head 1; the connection structure between the pressing plate 8 and the die head 1 is specifically set as: two sliders 801 are arranged on the opposite sides of the side wall of the pressing plate 8; moving chutes 103 are symmetrically opened on the inner wall of the die head 1; the sliders 801 are movably embedded in the moving chutes 103; the sliders 801 can slide up and down in the moving chutes 103, that is, the up and down movement of the pressing plate 8 in the die head 1 is realized.

[0083] The pressing plate 8 needs to pressurize the spinning raw material between the pressing plate 8 and the spinneret plate 2. However, the spinning raw material filtered by the filter plate above the pressing plate 8 directly falls onto the pressing plate 8 and cannot reach the spinneret plate 2. A simple plate-shaped filter plate cannot meet the requirements when the pressing plate 8 is provided.

[0084] As Figure 6 shown, a side wall arc plate 5 is provided above the filter plate 3 in this embodiment; an upper cover plate 4 is provided at the upper end opening of the side wall arc plate 5; a feed pipe 6 is centrally provided on the upper cover plate 4; a discharge pipe 7 is centrally provided below the filter plate 3; the spinning raw material passing through the filter plate 3 will converge into the discharge pipe 7 and flow out from the discharge pipe 7.

[0085] As Figure 8 shown, the specific structure of the filter plate 3 is set as follows: the inside of the filter plate 3 is set as a hollow structure; the panel above the hollow structure is set as a filter hole plate 301 with filter holes opened; the panel below the hollow structure is set as a lower bottom plate 302, and a discharge pipe 7 is centrally provided on the lower bottom plate 302.

[0086] The spinning raw material enters the space surrounded by the side wall arc plate 5 from the feed pipe 6 on the upper cover plate 4. The reason for setting the side wall as an arc plate structure is that when some spinning raw material splashes onto the side wall arc plate 5, it can flow down along the side wall arc plate 5 to the filter plate 3; at the filter plate 3, the spinning raw material is filtered for large-particle substances through the upper filter hole plate 301. The filtered spinning raw material is located in the hollow structure of the filter plate 3 and then is output from the discharge pipe 7 on the lower bottom plate 302; the spinning raw material output from the discharge pipe 7 should reach the space between the pressing plate 8 and the spinneret plate 2.

[0087] Therefore, a circular through hole is centrally opened on the pressing plate 8. As Figure 9 shown, the discharge pipe 7 passes through the pressing plate 8 from the circular through hole on the pressing plate 8, and the outer wall of the discharge pipe 7 fits with the inner wall of the circular through hole, but the discharge pipe 7 does not prevent the pressing plate 8 from moving up and down in the die head 1. When the pressing plate 8 moves down to the lowest position, the outlet at the lower end of the discharge pipe 7 is still located below the pressing plate 8.

[0088] The pressing plate 8 needs to move down under external pressurization to pressurize the spinning raw material below the pressing plate 8 and make the spinning raw material spray out from the spinneret plate 2.

[0089] As Figure 9As shown in the figure, two pressurized air pipe connectors 9 are arranged on the opposite sides of the side wall of the die head 1; one end of the pressurized air pipe connector 9 communicates with the inside of the die head 1, and the other end communicates with the outside; the end of the pressurized air pipe connector 9 communicating with the outside is connected to an air pump. The air pump pumps the gas in the gas cylinder into the die head 1 through the pressurized air pipe connector 9, into the space above the pressing plate 8; the injected gas generates a downward pressure on the pressing plate 8, and the pressing plate 8 moves downward, pressing the spinning raw material between the pressing plate 8 and the spinneret plate 2, improving the production efficiency of the filamentous fiber and making the formed filamentous fiber more uniform.

[0090] As Figure 6 shown, screw holes 401 are opened on the side wall of the upper cover plate 4; as Figure 3 shown, screw holes 401 are also opened on the side wall near the opening edge at the upper end of the die head 1;

[0091] The upper cover plate 4, the side wall arc plate 5 and the filter plate 3 are jointly arranged in the die head 1; the screw holes 401 on the upper cover plate 4 are aligned with the screw holes 401 on the die head 1, and screws are arranged in the screw holes 401; the upper cover plate 4, the side wall arc plate 5 and the filter plate 3 are installed in the die head 1.

[0092] Embodiment 4

[0093] Based on Embodiment 3, in Embodiment 3, after the pressing plate 8 is pressed and moves downward, it cannot move upward automatically to restore its original position; when pressed once, the pressing plate 8 has to rise slowly following the spinning raw material flowing into the lower part of the pressing plate 8; the pressing plate 8 itself will affect the inflow rate of the spinning raw material.

[0094] As Figure 11 shown, in this embodiment, a structure for the pressing plate to move upward automatically to restore its original position is provided; an elastic member 802 is arranged between the upper end of the slider 801 and the upper end of the moving chute 103; after the pressing plate 8 moves downward, if the applied air pressure disappears, the pressing plate 8 can automatically move upward to restore its original position under the action of the elastic member 802. Here, the elastic member 802 is a spring.

[0095] In the description of this specification, the description referring to terms such as "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in connection with that embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0096] The preferred embodiments of the present utility model disclosed above are only used to help illustrate the present utility model. The preferred embodiments do not describe all the details in detail, nor do they limit the present utility model to the specific embodiments described. Obviously, many modifications and variations can be made according to the content of this specification. These embodiments are selected and specifically described in this specification to better explain the principles and practical applications of the present utility model, so that those skilled in the relevant technical field can well understand and utilize the present utility model. The present utility model is only limited by the claims and their full scope and equivalents.

Claims

1. A quick-change spinneret orifice module assembly, characterized in that: include: Die head, delivery notch, sealing structure, spinneret; The lower end surface of the die head is configured as an open structure; A delivery notch is provided on the side wall below the die head; The spinneret is installed into the die head from the delivery notch, or the spinneret is removed from the die head from the delivery notch; A sealing structure is arranged on the side wall of the die head; the sealing structure is used for sealing the delivery notch.

2. A quick-change spinneret orifice module assembly according to claim 1, characterized in that: The circumference of the delivery notch is equal to 1 / 2 of the circumference of the outer wall of the die.

3. The quick-change spinneret orifice module assembly according to claim 1, characterized in that: The sealing structure comprises: a sealing arc plate, a bolt rod and a nut; The two sides of the delivery notch are each hinged to the first side of a sealing arc plate; An additional plate is arranged on the second side of the sealing arc plate; After the sealing arc plate tightly closes the delivery gap, the two attached plates are fitted together; The bolt rod is passed through the two attachment plates; nuts are arranged at both ends of the bolt rod.

4. The quick-change spinneret orifice module assembly according to claim 1, characterized in that: A groove is provided on the side wall of the spinneret.

5. The quick-change spinneret orifice module assembly according to claim 1, characterized in that: A filter plate is detachably arranged in the die head; a discharge pipe is arranged below the filter plate; the filtered spinning raw material flows out from the discharge pipe; The filter plate is used for filtering spinning raw materials.

6. A quick-change spinneret orifice module assembly according to claim 5, characterized in that: A pressing plate is arranged below the filter plate; The pressing plate is movably arranged in the die head; and the side wall of the pressing plate is in contact with the inner wall of the die head; The discharge pipe passes through the pressing plate, and the outlet of the discharge pipe is located below the pressing plate; Two pressurized air pipe joints are arranged on opposite sides of the side wall of the die head; One end of the pressurized air pipe joint is connected to the die head, and the other end is connected to the outside world; One end of the pressurized air pipe joint communicating with the outside is connected to an air pump.

7. A quick-change spinneret orifice module assembly according to claim 5, characterized in that: A side wall arc plate is arranged above the filter plate; An upper cover plate is arranged on the upper end opening of the side wall arc plate; A feed pipe is arranged on the upper cover plate; The side wall of the upper cover plate is provided with screw holes; the side wall close to the edge of the upper opening of the die head is also provided with screw holes.

8. A quick-change spinneret orifice module assembly according to claim 7, characterized in that: The interior of the filter plate is configured as a hollow structure; The panel above the hollow structure is configured as a filter plate with filter holes; The panel below the hollow structure is configured as a lower bottom plate, and a discharge pipe is centrally disposed on the lower bottom plate; The spinning raw materials are filtered through the filter plate, pass through the hollow structure, and finally flow out from the discharge pipe.

9. A quick-change spinneret orifice module assembly according to claim 6, characterized in that: A circular through hole is provided in the center of the pressing plate, the discharge pipe passes through the pressing plate from the circular through hole, the outer wall of the discharge pipe is in contact with the inner wall of the circular through hole, and the discharge pipe does not hinder the pressing plate from moving up and down in the die head; Two sliding blocks are arranged on opposite sides of the side wall of the pressing plate; The inner wall of the die head is symmetrically provided with movable slide grooves; The slider is movably embedded in the movable slide groove; the slider slides up and down in the movable slide groove, thereby realizing the up and down movement of the pressing plate in the die head.

10. A quick-change spinneret orifice module assembly according to claim 9, characterized in that: An elastic member is arranged between the upper end of the sliding block and the upper end of the movable sliding groove.

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