Multiple filtering device for municipal engineering water supply pipe

Abstract

The invention provides a municipal engineering water supply pipe multi-filtering device which comprises a tank body, and a plurality of annular filtering cavities used for containing filtering materials are sequentially formed in the tank body from inside to outside; the backwashing expansion mechanism is arranged at the top of the inner cavity of the tank body and comprises a piston piece vertically arranged in the tank body, a group of annular piston plates matched with the annular filter cavities are arranged on the piston piece, and the piston piece moves upwards through an adjusting mechanism arranged at the top end of the tank body; according to the present invention, through the arrangement of the backwashing expansion mechanism, the filtration materials in the annular filtration cavity are tightly attached to each other in the normal filtration stage so as to filter the water flowing through the filtration materials, and the annular piston plate moves upwards in the backwashing stage so as to increase the volume of the annular filtration cavity, such that the gaps between the filtration materials are increased, and the filtration efficiency is improved; impurities in the filter material can be washed and discharged more easily, the working time for washing the filter material is shortened, and the working efficiency for washing the filter material is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of municipal engineering water supply pipe filtering device, in particular to a municipal engineering water supply pipe multiple filtering device. BACKGROUND

[0002] Multi-media filter is a commonly used pretreatment equipment in municipal engineering water supply pipe network, which removes suspended solids, colloids and part of organic matter in water through physical interception and adsorption, and provides protection for subsequent deep purification; the filter generally adopts a vertical cylindrical steel container, which is internally filled with filter materials of multiple particle sizes and densities to form a layered filtering structure; the filter materials are arranged in a "fine at the top and coarse at the bottom" or "light at the top and heavy at the bottom" manner to form a density gradient; when the water flow passes from top to bottom, large particles are intercepted by the upper layer of filter materials, and small particles penetrate to the lower layer and are trapped, thereby realizing multiple graded filtration.

[0003] The multi-media filter is generally also provided with a backwashing system, which reversely washes the filter materials by high-pressure water or gas-water mixed flow to remove impurities in the gaps of the filter materials, restore the filtering capacity of the filter materials, avoid the problem of easy clogging of single filter material, and prolong the operation cycle; however, when backwashing operation is performed, due to the close fit between the filter materials and the accumulation of impurities in the gaps, the water flow or gas-water mixed flow is not easy to carry out the impurities when passing through the gaps of the filter materials, which results in a long washing time and reduces the washing efficiency.

[0004] Therefore, the present application improves the above problems and provides a municipal engineering water supply pipe multiple filtering device. SUMMARY

[0005] The present application aims at the problem that when the multi-media filter is backwashed, due to the close fit between the filter materials and the accumulation of impurities in the gaps, the water flow or gas-water mixed flow is not easy to carry out the impurities when passing through the gaps of the filter materials, which results in a long washing time and reduces the washing efficiency.

[0006] In order to achieve the above-mentioned purpose, the present application provides a municipal engineering water supply pipe multiple filtering device to improve the above-mentioned problems.

[0007] The present application is as follows:

[0008] The utility model provides a kind of municipal engineering water supply pipe multiple filtering device, including tank body, the tank body is sequentially provided with multiple annular filter cavities for placing filter material from inside to outside;And backwash expansion mechanism is set in the top of the tank body inner cavity, for improving the volume of the annular filter cavity inner cavity, including piston piece vertically arranged in the tank body, the piston piece has a group of annular piston plate corresponding to each annular filter cavity, filtering stage, the annular piston plate is located at the top of corresponding annular filter cavity and has rising distance with the top opening of annular filter cavity, backwash stage, the piston piece is moved up by adjusting mechanism arranged at the top of the tank body, improve the volume of the filter cavity inner cavity.

[0009] As the preferred technical solution of the present application, the top end of the tank body is fitted with a tank cover, the top opening of the tank body is fitted with a sealing plate, the side of the tank body has a water inlet pipe and a sewage pipe communicating with the outermost annular filter cavity, and the middle of the bottom end of the tank body has a water outlet pipe.

[0010] As the preferred technical solution of the present application, the tank body is sequentially provided with a plurality of annular partitions from inside to outside, a plurality of flow-through holes with aperture increasing sequentially are sequentially formed in the plurality of annular partitions from inside to outside, the annular filter cavities are formed between the inner walls of the two adjacent annular partitions and the bottom of the tank body, and the annular piston plate is slidably connected with the inner walls of the two adjacent annular partitions.

[0011] As the preferred technical solution of the present application, the tank body is sequentially provided with a plurality of annular partitions from inside to outside, a plurality of flow-through holes with aperture increasing sequentially are sequentially formed in the plurality of annular partitions from inside to outside, the annular filter cavities are formed between the inner walls of the two adjacent annular partitions and the bottom of the tank body, and the annular piston plate is slidably connected with the inner walls of the two adjacent annular partitions.

[0012] As the preferred technical solution of the present application, the piston piece further includes a connecting plate, a plurality of threaded seats are fixed on each annular piston plate in a ring shape at equal intervals, a connecting hole corresponding to each threaded seat is formed in the connecting plate, and the threaded seat is fixed with the connecting plate through a threaded fastener penetrating through the connecting hole.

[0013] As the preferred technical solution of the present application, the adjusting mechanism includes a threaded sleeve rotatably arranged in the middle of the tank cover, a threaded rod corresponding to the threaded sleeve is fixed on the connecting plate, the threaded rod is threadedly matched with the threaded sleeve, the top end of the threaded sleeve is located outside the tank cover and fixed with a handle, and a guide structure is arranged in the tank body for linear movement of the connecting plate.

[0014] As the preferred technical solution of the present application, the top of the annular partition located in the middle of the tank body inner cavity has a top plate, the guide structure includes a guide cylinder fixed on the top plate, and a guide rod is fixed on the connecting plate and penetratingly connected with the guide cylinder.

[0015] As the preferred technical scheme of the present application, the inner wall of the top of the tank body is fixed with an annular sealing seat, the connecting plate moves vertically in the opening of the sealing seat, a sealing groove is formed in the sealing seat, the bottom of the sealing plate is provided with a sealing ring matched with the sealing groove, and the middle part of the sealing plate is provided with a connecting seat for vertical movement of the threaded rod.

[0016] As the preferred technical scheme of the present application, the bottom end of the rotating shaft is located at the bottom of the annular sealing plate and is fixed with a diffusion plate, the top of the inner cavity of the tank body is provided with a driving mechanism for driving the diffusion plate to rotate, and the diffusion plate rotates synchronously when the connecting plate moves upward.

[0017] As the preferred technical scheme of the present application, the driving mechanism includes a driving rod fixed to the bottom end of the sealing plate, a driving block is fixed to the driving rod, the top end of the rotating shaft penetrates through the connecting plate and is rotationally connected with the connecting plate, the top of the rotating shaft is provided with a driving groove for penetrating connection of the driving rod, arc-shaped grooves and linear grooves smoothly connected at the end of the arc-shaped grooves are formed in the side of the driving groove, and the driving block is located at the top end of the linear groove.

[0018] Compared with the prior art, the present application has the following beneficial effects:

[0019] In the scheme of the present application:

[0020] The backwashing and expansion mechanism includes an annular piston plate that can move up and down on the top of the corresponding annular filter cavity. In the normal filtering stage, the annular piston plate is fixed in position and tightly fits between the filter materials in the annular filter cavity to filter the water flowing through the filter materials. In the backwashing stage, the annular piston plate moves upward to increase the volume of the annular filter cavity, so that the gap between the filter materials increases, making it easier to wash out the impurities placed in the filter materials, reducing the working time of the filter materials, and improving the working efficiency of the filter materials. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 The overall structural schematic view of the municipal engineering water supply pipe multiple filtering device provided by the present application is shown in the figure.

[0022] Figure 2 The structural schematic view of the tank cover and tank body separation of the municipal engineering water supply pipe multiple filtering device provided by the present application is shown in the figure.

[0023] Figure 3 The overall structural schematic view of the municipal engineering water supply pipe multiple filtering device provided by the present application is shown in the figure. Figure 2 The enlarged view of position A in the figure.

[0024] Figure 4The figure is a front view of the tank of the multiple filtering device for municipal engineering water supply pipe provided by the application;

[0025] Figure 5 The figure is a structure diagram of the backwashing expansion mechanism of the multiple filtering device for municipal engineering water supply pipe provided by the application;

[0026] Figure 6 The figure is a structure diagram of the connecting plate of the multiple filtering device for municipal engineering water supply pipe provided by the application;

[0027] Figure 7 The figure is a structure diagram of the sealing plate of the multiple filtering device for municipal engineering water supply pipe provided by the application;

[0028] Figure 8 The figure is a structure diagram of the driving rod and the rotating shaft connection of the multiple filtering device for municipal engineering water supply pipe provided by the application.

[0029] The figure shows:

[0030] 100, tank; 101, tank cover; 102, sealing plate; 103, water inlet pipe; 104, sewage pipe; 105, water outlet pipe; 106, annular partition plate; 107, flow-through hole; 108, sealing seat; 109, sealing groove; 110, sealing ring; 111, connecting seat;

[0031] 200, backwashing expansion mechanism; 201, annular piston plate; 202, connecting plate; 203, threaded seat; 204, connecting hole; 205, threaded fastener; 206, threaded sleeve; 207, threaded rod; 208, handle; 209, top plate; 210, guide cylinder; 211, guide rod; 212, rotating shaft; 213, diffusion plate; 214, driving rod; 215, driving sliding block; 216, driving groove; 217, arc-shaped groove; 218, linear groove. DETAILED DESCRIPTION

[0032] In order for those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should fall within the scope of protection of the present application.

[0033] The present application will be further described below with reference to the embodiments.

[0034] Embodiment: Refer to Figures 1 to 8The utility model provides a kind of municipal engineering water supply pipe multiple filtering device, for the water quality of water supply pipe transmission carries out multistage filtering operation, including jar body 100, multiple annular filter cavities for placing filter material are sequentially arranged from inside to outside in jar body 100, preferably, as shown in the figure, three annular filter cavities are sequentially arranged from inside to outside, the outermost annular filter cavity can be used as the coarse filter layer of filtered water quality, can place coarse quartz sand filter material, large particle is retained by this layer filter material, forms preliminary filtration;Correspondingly, the annular filter cavity of middle layer can be used as the fine filter layer of filtered water quality, can place fine quartz sand filter material, further intercepts medium particle size impurity;The innermost annular filter cavity is then used as the precision filter layer of filtered water quality, can place activated carbon filter material, intercepts small particle, adsorbs organic matter, residual chlorine and peculiar smell, improves water quality taste;Multiple filter material layers are the core of multiple filtering device, usually by three different particle sizes and densities of medium sequentially filled, not specifically limited here, can be selected according to actual application scene;

[0035] In order to solve the problem that when the multi-medium filter is backwashed, due to the close fit between the filter materials and the impurities accumulated in the gaps, the water flow or gas-water mixed flow is not easy to carry out the impurities when passing through the gaps between the filter materials, resulting in a long washing time and reducing the washing efficiency.

[0036] In the present application, a backwashing expansion mechanism 200 is provided, which is arranged at the top of the inner cavity of the jar body 100, for increasing the volume of the inner cavity of the annular filter cavity. Specifically, it includes a piston member arranged vertically in the jar body 100, and the piston member has a set of annular piston plates 201 matched with the annular filter cavities. Correspondingly, in the present application, the annular piston plates 201 are provided with three, and in the filtering stage, the annular piston plates 201 are located at the top of the corresponding annular filter cavities and have an upward distance from the top opening of the annular filter cavities. In the backwashing stage, the piston member is moved upward by the adjusting mechanism arranged at the top of the jar body 100, to increase the volume of the filter cavity.

[0037] By providing the backwashing expansion mechanism 200, which includes an annular piston plate 201 that can move up and down at the top of the corresponding annular filter cavity, in the normal filtering stage, the annular piston plate 201 is fixed in position and closely fits between the filter materials in the annular filter cavity, to filter the water flowing through the filter materials. In the backwashing stage, the annular piston plate 201 is moved upward, to increase the volume of the annular filter cavity and increase the gap between the filter materials, so that the impurities in the filter materials are more easily washed out, reducing the working time of washing the filter materials and improving the working efficiency of washing the filter materials.

[0038] Specifically, the top end of the tank body 100 is adapted to be mounted with a tank cover 101, the tank cover 101 and the outer edge of the tank body 100 are both provided with a butt joint edge plate (not numbered in the figure), the butt joint edge plate is provided with a mounting hole, so as to disassemble and assemble the tank cover 101, the top opening of the tank body 100 is adapted to be mounted with a sealing plate 102, so as to improve the sealing performance of the tank body 100, the side of the tank body 100 is provided with a water inlet pipe 103 and a sewage pipe 104 which are in communication with the outermost annular filter cavity, the middle of the bottom end of the tank body 100 is provided with a water outlet pipe 105, the end of the water inlet pipe 103, the sewage pipe 104 and the water outlet pipe 105 is provided with a flange seat, so as to be connected with external pipes, wherein the water outlet pipe 105 at the bottom is matched with an external pipe to install a backwashing device, that is, a water flow is reversely injected into the tank body 100 to wash the filter material in each annular filter cavity, which is a relatively mature technical means at present, and will not be described here.

[0039] Further, a plurality of annular partitions 106 are sequentially arranged in the tank body 100 from inside to outside, a plurality of flow-through holes 107 with gradually increasing diameters are sequentially arranged on the plurality of annular partitions 106 from inside to outside, so as to flow the water filtered by the filter material in the corresponding annular filter cavity, and the annular filter cavities are formed between the inner walls of the adjacent two annular partitions 106 and the bottom of the tank body 100, and the annular piston plate 201 is slidably connected with the inner walls of the adjacent two annular partitions 106.

[0040] Further, the outermost annular partition 106 in the tank body 100 and the inner wall of the tank body 100 are further provided with a water inlet cavity, the water inlet pipe 103 and the sewage pipe 104 are in communication with the water inlet cavity, so as to improve the contact range of the water entering the annular water inlet cavity and the filter material in the outermost annular filter cavity, and is beneficial to improve the filtering efficiency of the water quality.

[0041] Further, the piston member further comprises a connecting plate 202, a plurality of threaded seats 203 are fixed on each annular piston plate 201 in a ring shape at equal intervals, a connecting hole 204 corresponding to the plurality of threaded seats 203 is formed on the connecting plate 202, and the threaded seat 203 is fixed with the connecting plate 202 through a threaded fastener 205 (such as a bolt) penetrating through the connecting hole 204, and the three annular piston plates 201 and the connecting plate 202 are detachably installed, so as to replace the annular piston plate 201 which is damaged alone, and improve the practicability.

[0042] Further, the adjusting mechanism comprises a threaded sleeve 206 rotatably arranged in the middle of the tank cover 101, a threaded rod 207 corresponding to the threaded sleeve 206 is fixed on the connecting plate 202, the threaded rod 207 is threadedly matched with the threaded sleeve 206, the top end of the threaded sleeve 206 is located outside the tank cover 101 and is fixed with a handle 208, and a guide structure for linear movement of the connecting plate 202 is arranged in the tank body 100.

[0043] When the filter material in the tank 100 is backwashed, the threaded sleeve 206 is rotated by rotating the handle 208, and under the linear guidance of the guide structure, the threaded rod 207 starts to move upward with the connecting plate 202 and the three annular piston plates 201, and the volume of the annular filter chamber increases, so that the filter material is no longer in a close contact state, which is beneficial to improve the gap between the adjacent filter materials and wash out the impurities trapped by the filter material.

[0044] Specifically, the top plate 209 is arranged on the top of the annular partition plate 106 in the middle of the tank 100, the guide structure includes a guide cylinder 210 fixed on the top plate 209, and the connecting plate 202 is fixed with a guide rod 211 penetratingly connected with the guide cylinder 210, and the guide cylinder 210 is coaxial with the connecting plate 202 and cooperates with the guide rod 211 to linearly guide the connecting plate 202.

[0045] Specifically, the annular sealing seat 108 is fixed on the inner wall of the top of the tank 100, the connecting plate 202 moves vertically in the opening of the sealing seat 108, the sealing groove 109 is arranged on the sealing seat 108, the bottom of the sealing plate 102 is provided with a sealing ring 110 matched with the sealing groove 109, which improves the sealing effect of the tank 100 and reduces the probability of water leakage at the top of the tank 100 when the annular piston plate 201 is damaged, and the middle of the sealing plate 102 is provided with a connecting seat 111 for vertical movement of the threaded rod 207, preferably, the top of the threaded rod 207 is provided with a threaded portion connected with the threaded cylinder, and the portion penetratingly connected with the connecting seat 111 is smooth.

[0046] Specifically, the rotating shaft 212 is further arranged on each annular sealing plate 102, the bottom end of the rotating shaft 212 is fixed with the diffuser plate 213 on the bottom of the annular sealing plate 102, and the top of the inner cavity of the tank 100 is provided with a driving mechanism for driving the diffuser plate 213 to rotate, the diffuser plate 213 rotates synchronously when the connecting plate 202 moves upward, and the diffuser plate 213 rotates by a certain angle after the annular piston plate 201 moves upward, because the volume of the annular filter chamber increases, the gap between the filter materials pressed by the diffuser plate 213 becomes larger, which is more conducive to washing out the impurities trapped by the filter material.

[0047] Further, the driving mechanism comprises a driving rod 214 fixed to the bottom end of the sealing plate 102, a driving sliding block 215 fixed to the driving rod 214, the top end of the rotating shaft 212 penetrates through the connecting plate 202 and is rotationally connected with the connecting plate 202, the top of the rotating shaft 212 is provided with a driving groove 216 for penetrating connection of the driving rod 214, the side of the driving groove 216 is provided with an arc-shaped groove 217 and a linear groove 218 which is connected with the arc-shaped groove 217 in a smooth manner, the driving sliding block 215 is located at the top end of the linear groove 218, when the connecting plate 202 is driven to move upward by the rotating handle 208, the driving sliding block 215 which is fixed with the driving shaft and the sealing plate 102 firstly slides in the linear groove 218, that is, the diffusion plate 213 only moves upward with the annular piston plate 201, when the driving sliding block 215 enters the arc-shaped groove 217, the driving sliding block 215 starts to extrude the inner wall of the arc-shaped groove 217 to drive the diffusion plate 213 to rotate, the gap between the filter materials which are extruded by the diffusion plate 213 becomes larger, the purpose of the design is that when the connecting plate 202 with the annular piston plate 201 resets after the flushing of the filter materials is completed, the diffusion plate 213 only resets linearly after the self-rotation reset, the influence of the annular piston plate 201 on the re-tight extrusion of the filter materials is reduced, and the filtering effect of the filter materials on the water quality is ensured.

[0048] In the present application, unless otherwise clearly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected or communicated with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication or interaction relationship between two elements, unless otherwise clearly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0049] Obviously, the above-described embodiments are only a part of the embodiments of the present application, and are not all the embodiments. The preferred embodiments of the present application are shown in the drawings, but do not limit the patent scope of the present application. The present application can be realized in many different forms, and conversely, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments, or equivalently replace some technical features. Any equivalent structure made by using the contents of the specification and drawings, directly or indirectly applied to other related technical fields, is also within the patent protection scope of the present application.

Claims

1. A multi-filtration device for municipal engineering water supply pipes, characterized in that: include: A tank body (100), wherein a plurality of annular filter cavities for placing filter materials are sequentially arranged in the tank body (100) from the inside to the outside; A backwash expansion mechanism (200) is arranged at the top of the inner cavity of the tank body (100) and is used to increase the volume of the inner cavity of the annular filter chamber. It includes a piston member vertically arranged in the tank body (100), and the piston member has a group of annular piston plates (201) adapted to each of the annular filter chambers. During the filtration stage, the annular piston plate (201) is located at the top of the corresponding annular filter chamber and has an ascending distance from the top opening of the annular filter chamber. During the backwash stage, the piston member moves upward through the adjustment mechanism arranged at the top of the tank body (100) to increase the volume of the inner cavity of the filter chamber.

2. A multi-filtration device for municipal engineering water supply pipes according to claim 1, characterized in that: The top of the tank body (100) is adapted to be installed with a tank cover (101), the top opening of the tank body (100) is adapted to be installed with a sealing plate (102), the side of the tank body (100) is provided with a water inlet pipe (103) and a sewage discharge pipe (104) connected to the outermost annular filter chamber, and the middle of the bottom end of the tank body (100) is provided with a water outlet pipe (105).

3. The multi-filtration device for municipal engineering water supply pipes according to claim 2, characterized in that: A plurality of annular baffles (106) are sequentially arranged in the tank body (100) from the inside to the outside, and flow holes (107) with successively increasing apertures are sequentially opened in the plurality of annular baffles (106) from the inside to the outside. An annular filter chamber is formed between two adjacent annular baffles (106) and the bottom inner wall of the tank body (100), and the annular piston plate (201) is slidably connected to the inner walls of the two adjacent annular baffles (106).

4. A multi-filtration device for municipal engineering water supply pipes according to claim 3, characterized in that: A water inlet cavity is also provided between the outermost annular partition (106) in the tank body (100) and the inner wall of the tank body (100), and the water inlet pipe (103) and the sewage discharge pipe (104) are respectively connected to the water inlet cavity.

5. The multi-filtration device for municipal engineering water supply pipes according to claim 4, characterized in that: The piston member also includes a connecting plate (202), and a plurality of threaded seats (203) are fixed in an annular shape and equidistantly on each of the annular piston plates (201). The connecting plate (202) is provided with connecting holes (204) corresponding one-to-one to the plurality of threaded seats (203). The threaded seats (203) are fixed to the connecting plate (202) by threaded fasteners (205) passing through the connecting holes (204).

6. The multi-filtration device for municipal engineering water supply pipes according to claim 5, characterized in that: The adjustment mechanism comprises a threaded sleeve (206) rotatably arranged in the middle of the tank cover (101); a threaded rod (207) corresponding to the threaded sleeve (206) is fixed on the connecting plate (202); the threaded rod (207) is threadedly engaged with the threaded sleeve (206); the top end of the threaded sleeve (206) is located outside the tank cover (101) and is fixed with a handle (208); and a guide structure for the connecting plate (202) to perform linear movement is provided in the tank body (100).

7. The multi-filtration device for municipal engineering water supply pipes according to claim 6, characterized in that: A top plate (209) is provided on the top of the annular partition (106) located in the middle of the inner cavity of the tank body (100); the guide structure includes a guide cylinder (210) fixed on the top plate (209); and a guide rod (211) is fixed on the connecting plate (202) and is interlaced with the guide cylinder (210).

8. The multi-filtration device for municipal engineering water supply pipes according to claim 7, characterized in that: An annular sealing seat (108) is fixed to the inner wall of the top of the tank body (100), the connecting plate (202) moves vertically in the opening of the sealing seat (108), a sealing groove (109) is provided on the sealing seat (108), the bottom of the sealing plate (102) has a sealing ring (110) adapted to the sealing groove (109), and the middle of the sealing plate (102) has a connecting seat (111) for the threaded rod (207) to move vertically and interspersed.

9. The multi-filtration device for municipal engineering water supply pipes according to claim 8, characterized in that: A rotating shaft (212) is also installed on each of the annular sealing plates (102). The bottom end of the rotating shaft (212) is located at the bottom of the annular sealing plate (102) and is fixed with a diffusion plate (213). A driving mechanism for driving the diffusion plate (213) to rotate is provided at the top of the inner cavity of the tank body (100). The diffusion plate (213) rotates synchronously with the upward movement of the connecting plate (202).

10. The multi-filtration device for municipal engineering water supply pipes according to claim 9, characterized in that: The driving mechanism comprises a driving rod (214) fixed to the bottom end of the sealing plate (102), a driving slider (215) being fixed on the driving rod (214), a top end of the rotating shaft (212) passing through the connecting plate (202) and being rotatably connected to the connecting plate (202), a driving groove (216) for the driving rod (214) to be inserted and connected is provided at the top of the rotating shaft (212), an arcuate groove (217) and a linear groove (218) smoothly connected to the end of the arcuate groove (217) are provided through the side of the driving groove (216), and the driving slider (215) is located at the top end of the linear groove (218).

Images