A concrete double-column frame casting template

Abstract

The invention relates to the technical field of double-limb column construction, in particular to a concrete double-limb column frame body casting template, wherein the limb column template on one side is formed by a plurality of groups of casting template units one and a plurality of groups of casting template units two being arranged longitudinally, and a web casting mold is connected between the limb column templates on both sides; the casting template unit one and the casting template unit two both have U-shaped cross sections, two identical casting template units form a group, are fixed into a rectangular frame by locking buckles, and upper and lower adjacent groups are connected by locking buckles; the end of the web casting mold is connected to the casting template unit one by an adjustable connector; the cast-in-place mold of the double-limb column can be quickly spliced ​​by the locking buckle, the casting template unit one, the casting template unit two and the web casting mold in cooperation with the locking buckle, thereby shortening the mold making and mold supporting time, and the mold can be quickly separated after casting, which not only improves the demoulding efficiency, but also improves the use frequency of the mold, thereby reducing the production cost.

Description

Technical Field

[0001] The invention relates to the technical field of double-limb column construction, in particular to a concrete double-limb column frame body casting template. Background Art

[0002] Concrete double-limb column is an important structure in construction, especially in the construction of industrial plants. The double-limb column frame body is a concrete column with two limbs connected by a web, which can form a stable support structure and improve the stability and bearing performance of the building. Its web includes two types: flat web and diagonal web. The double-limb column structure with flat web or diagonal web can withstand greater lateral force and shear force. The existing concrete double-limb column is generally constructed using prefabricated steel bars processed by a steel bar factory. After the prefabricated steel bar components are tied and fixed, formwork is carried out on the outside. The construction difficulty in the prior art lies in the formwork operation. Since the double-limb column has a web, the web may be a flat web or diagonal web of different inclinations in different construction operations. It is necessary to first mold according to the inclination angle of the web, and then open holes at the corresponding connection points of the template for connection. The mold cannot be universal and it is difficult to adjust the angle, which greatly increases the construction time. Therefore, a casting template suitable for the concrete double-limb column frame body is needed. Summary of the invention

[0003] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a concrete double-column frame casting template which has strong turnover, is convenient for rapid formwork, and improves construction efficiency.

[0004] The technical solution adopted by the present invention to solve its technical problem is:

[0005] A concrete double-column frame casting template, wherein a single-side column template is formed by a plurality of groups of casting template units 1 and 2 arranged longitudinally, and a web casting mold is connected between the column templates on both sides; the casting template unit 1 and the casting template unit 2 both have U-shaped cross-sections, two identical casting template units form a group, and are fixed into a rectangular frame by locking buckles, and the upper and lower adjacent groups are connected by locking buckles; the end of the web casting mold is connected to the casting template unit 1 by an adjustable connector.

[0006] Preferably, a further technical solution of the present invention is:

[0007] Preferably, the outer sides of the upper and lower edges of casting template unit 1 and casting template unit 2 are provided with end connecting ribs for snap-fitting the lock buckle; the outer sides of the two side edges of casting template unit 1 are provided with side connecting ribs for snap-fitting the lock buckle.

[0008] Preferably, a plurality of first longitudinal reinforcing ribs are arranged at intervals on the outer side of the casting template unit 1, and both ends of the first longitudinal reinforcing ribs are respectively connected to the end connecting ribs on the outer sides of the upper edge and the lower edge.

[0009] Preferably, the casting formwork unit two includes an outer formwork and an inner formwork, and the outer formwork is slidably connected to the inner formwork up and down; the sliding connection structure is that a plurality of second longitudinal reinforcing ribs are arranged at intervals on the outer wall of the inner formwork, and avoidance grooves are arranged on the outer formwork corresponding to the second longitudinal reinforcing ribs on the inner formwork; the second longitudinal reinforcing ribs are slidably connected in the avoidance grooves; first overhangs for snap-fitting locks are arranged at the left and right edges of the inner formwork, and second overhangs for snap-fitting locks are arranged at the left and right edges of the outer formwork.

[0010] Preferably, a horizontally arranged outer support rod is connected to the outer side of the outer template, and the outer support rod has a U-shaped structure and is fixedly connected to the outer end surface of the avoidance groove on the outer template; a horizontally arranged adjustment rod is also connected to the outer side of the inner template, and the adjustment rod has a U-shaped structure and is fixedly connected to the outer end surface of the second longitudinal reinforcement rib on the inner template.

[0011] Preferably, groove plates are provided on two opposite sides of the avoidance groove.

[0012] Preferably, it also includes a limit rod for limiting the sliding position of the inner template. The limit rod has a U-shaped structure, and a plurality of slots adapted to the second longitudinal reinforcement ribs are arranged on the inner side of the limit rod. After the limit rod is connected to the second longitudinal reinforcement rib of the inner template through the slots, the inner side wall of the limit rod is in contact with the outer side wall of the inner template, and the lower end face of the limit rod abuts against the upper edge of the outer template.

[0013] Preferably, the belly rod casting mold includes an upper half pipe and a lower half pipe, upper half flange connection plates are arranged at both ends of the upper half pipe, and lower half flange connection plates are arranged at both ends of the lower half pipe. The upper half pipe and the lower half pipe are buckled and fixed by pipe clamps to form a belly rod casting pipe. The upper half flange connection plate and the lower half flange connection plate are spliced ​​into a first flange connection plate, and both ends of the belly rod casting pipe are connected to the adjustable connector through the first flange connection plate.

[0014] Preferably, the adjustable connecting head includes a spherical air outlet, and a through hole adapted to the spherical air outlet is provided at the location on the casting template unit where the spherical air outlet is connected, one end of the spherical air outlet is sealedly connected to the through hole on the casting template unit via a sealing ring, and a joint extension tube is provided at the other end of the spherical air outlet, and a second flange connecting plate for connecting to the first flange connecting plate is provided at the end of the joint extension tube.

[0015] Preferably, the lock includes a fixed seat, the fixed seat is provided with a through hole running through the left and right sides, a locking rod is slidably connected in the through hole, the end of the locking rod is passed through the fixed seat, a first clamping block is provided on the fixed seat, and a second clamping block is provided at the right end of the locking rod; a plurality of ratchets are provided on the locking rod along the length of the locking rod; an adjusting slot is provided on the fixed seat, the adjusting slot is connected to the through hole, a ratchet is rotatably connected in the adjusting slot, the ratchet is meshed with the ratchet teeth on the locking rod, and a nut is coaxially connected to the ratchet; a group of ratchets are symmetrically provided on the left and right sides of the adjusting slot, two in a group, the ratchets are connected to the side walls of the adjusting slot by a spring, and the two ratchets can respectively limit the ratchet from rotating in different directions; a paddle is rotatably connected between the two ratchets in the adjusting slot, which is used to paddle the ratchet to engage or disengage the ratchet; one end of the paddle's rotating shaft passes through the fixed seat, and a rotating handle is connected to the end passing through the fixed seat.

[0016] Compared with the prior art, the present invention adopting the above technical solution has the following outstanding features:

[0017] By means of locking buckles, casting template unit one, casting template unit two and the web casting mold, the cast-in-place mold of the double-limb column can be quickly assembled in cooperation with the locking buckles, thereby shortening the mold making and mold supporting time. After pouring, the mold can be quickly separated, which not only improves the demolding efficiency, but also increases the frequency of mold use, thereby reducing production costs; at the same time, through the adjustable connecting head, it is possible to switch between flat webs and inclined webs of various angles, with extremely strong adaptability; by setting a slidingly connected outer template and inner template, the height of the limb column mold assembled by the casting template unit two can be adjusted, and then the inclination angle of the web casting mold on the upper layer can be adjusted, further increasing the adaptability range. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of a concrete double-column frame casting template according to an embodiment of the present invention;

[0019] Figure 2 It is a schematic diagram of the structure of a group of casting template units 2 connected by locking buckles in an embodiment of the present invention;

[0020] Figure 3 yes Figure 2 Schematic diagram of the cross-sectional structure at AA in the middle;

[0021] Figure 4 yes Figure 2 Schematic diagram of the cross-section structure at BB in the middle;

[0022] Figure 5 This is a schematic diagram of the structure of a group of casting template units connected by locks in an embodiment of the present invention;

[0023] Figure 6 is a schematic diagram of a top view of a structure of two casting template units after being aligned in an embodiment of the present invention;

[0024] Figure 7 2 is a schematic diagram of a structure in which a web casting mold is connected to a casting template unit 1 through an adjustable connector in an embodiment of the present invention;

[0025] Figure 8 is a schematic structural diagram of a lock buckle in an embodiment of the present invention;

[0026] Fig. 9 Schematic diagram of the cross-sectional structure of the lock buckle in the embodiment of the present invention.

[0027] Description of the accompanying drawings: 1. Casting template unit 1; 2. Casting template unit 2; 201. External template; 2011. Avoidance groove; 2012. Second external cantilever; 2013. Groove plate; 202. Internal template; 2021. Second longitudinal reinforcement rib; 2022. First external cantilever; 203. External support rod; 204. Adjustment rod; 205. Limit rod; 2051. Slot; 3. Web casting mold; 301. Upper half pipe; 302. Lower half pipe; 303. First flange connection plate; 4. Locking buckle; 401 , fixing seat; 402, locking rod; 4021, ratchet; 4022, expansion slot; 403, first clamp; 404, second clamp; 405, universal ball; 406, ratchet; 407, nut; 408, spring; 409, pawl; 4010, paddle; 4011, rotating handle; 5, adjustable connector; 501, spherical air outlet; 502, connector extension tube; 503, second flange connection plate; 6, end connecting ribs; 7, side connecting ribs; 8, first longitudinal reinforcing ribs; 9, pipe clamp. DETAILED DESCRIPTION

[0028] The present invention is further described below in conjunction with specific embodiments, the purpose of which is only to provide a better understanding of the content of the present invention. Therefore, the examples given do not limit the protection scope of the present invention.

[0029] like Figure 1 As shown, this embodiment provides a concrete double-limb column frame casting template, wherein the limb column template on one side is composed of a plurality of groups of casting template units 1 and a plurality of groups of casting template units 2 arranged longitudinally, and a web casting mold 3 is connected between the limb column templates on both sides; the casting template units 1 and 2 are both U-shaped in cross section, with every two casting template units 1 forming a group, and every two casting template units 2 forming a group, and each group is fixed into a rectangular frame by a lock 4; the upper and lower adjacent groups are connected by a lock 4; the end of the web casting mold 3 is connected to the casting template unit 1 by an adjustable connector 5; wherein, as Figure 2-6The outer sides of the upper and lower edges of the casting template unit 1 and the casting template unit 2 are provided with end connecting ribs 6 for snapping into the lock buckle 4; the outer sides of the two side edges of the casting template unit 1 are provided with side connecting ribs 7, and the two casting template units 1 are snap-fitted and fixed to the oppositely arranged side connecting ribs 7 through the lock buckle 4 to form a set of rectangular frames.

[0030] like Figure 5 A plurality of first longitudinal reinforcing ribs 8 are also arranged at intervals on the outside of the casting template unit 1, and both ends of the first longitudinal reinforcing ribs 8 are respectively connected to the end connecting ribs 6 on the outside of the upper edge and the lower edge.

[0031] like Figure 2 , Figure 3 The casting template unit 2 includes an outer template 201 and an inner template 202, and the outer template 201 is slidably connected to the inner template 202 up and down; the specific sliding connection structure is that a plurality of second longitudinal reinforcing ribs 2021 are arranged at intervals on the outer wall of the inner template 202, and an avoidance groove 2011 is arranged on the outer template 201 corresponding to the second longitudinal reinforcing rib 2021 on the inner template 202, and the second longitudinal reinforcing rib 2021 is slidably connected in the avoidance groove 2011; the avoidance groove 2011 can be set as a groove with a U-shaped cross section, and can also be set as a through groove. In this embodiment, the avoidance groove 2011 is taken as a through groove as an example. The through groove is set as a U-shaped groove, and an outer template 201 with a thinner plate thickness can be selected; it is beneficial to reduce the template manufacturing cost and reduce the template weight; the left and right edges of the inner template 202 are provided with a first outer cantilever 2022 for snapping the lock buckle 4, and the left and right edges of the outer template 201 are provided with a second outer cantilever 2012 for snapping the lock buckle 4.

[0032] The outer side of the outer formwork 201 is also connected to a horizontally arranged outer support rod 203, which has a U-shaped structure and is fixedly connected to the outer end surface of the avoidance groove 2011 on the outer formwork 201; the outer side of the inner formwork 202 is also connected to a horizontally arranged adjustment rod 204, which has a U-shaped structure and is fixedly connected to the outer end surface of the second longitudinal reinforcement rib 2021 on the inner formwork 202, and groove plates 2013 are arranged on the opposite side surfaces in the avoidance groove 2011; in this actual embodiment, two outer support rods 203 are arranged on each outer formwork 201 in the horizontal and vertical directions, and the adjustment rod 204 is arranged between the two outer support rods 203, and the outer support rod 203 can further play a limiting role on the adjustment rod 204; when the inner formwork 202 is to be slid, the construction personnel can hold the adjustment rod 204 and slide it up and down to adjust it; by sliding and adjusting the inner formwork 202, the height of the casting formwork unit 22 can be adjusted, and then the inclination angle of the belly rod casting mold 3 can be adjusted.

[0033] like Figure 4, and also includes a limiting rod 205 for limiting the sliding position of the inner template 202. The limiting rod 205 is a U-shaped structure, and a plurality of slots 2051 adapted to the second longitudinal reinforcing rib 2021 are arranged on the inner side of the limiting rod 205. After the limiting rod 205 is connected to the second longitudinal reinforcing rib 2021 of the inner template 202 through the slots 2051, the inner side wall of the limiting rod 205 is in contact with the outer side wall of the inner template 202, and the lower end surface of the limiting rod 205 is in contact with the upper edge of the outer template 201; after the limiting rod 205 is connected to the second longitudinal reinforcing rib 2021 of the inner template 202, since the limiting rod 205 is stuck at the top of the avoidance groove 2011, the relative position relationship between the inner template 202 and the outer template 201 is fixed. At the same time, since the limiting rod 205 is stuck at the top of the avoidance groove 2011, it also plays a role in preventing the poured concrete from overflowing.

[0034] like Figure 7 To facilitate demoulding, the web casting mold 3 includes an upper half pipe 301 and a lower half pipe 302. Upper half flange connection plates are arranged at both ends of the upper half pipe 301, and lower half flange connection plates are arranged at both ends of the lower half pipe 302. The upper half pipe 301 and the lower half pipe 302 are buckled and fixed by pipe clamps 9 to form a web casting pipe. The upper half flange connection plate and the lower half flange connection plate are spliced ​​into a first flange connection plate 303. Both ends of the web casting pipe are connected to the adjustable connector 5 through the first flange connection plate 303.

[0035] like Figure 7 The adjustable connector 5 includes a spherical air vent 501. A through hole adapted to the spherical air vent 501 is provided at the location where the spherical air vent 501 is connected on the casting template unit 1. One end of the spherical air vent 501 is sealed and connected to the through hole on the casting template unit 1 through a sealing ring. A joint extension pipe 502 is provided at the other end of the spherical air vent 501. A second flange connection plate 503 for connecting to the first flange connection plate 303 is provided at the end of the joint extension pipe 502. After casting, the spherical air vent 501 and the joint extension pipe 502 do not need to be disassembled. It can also be cut and removed after the concrete is completely solidified; in order to facilitate the demoulding of the casting template unit 1 connected to the adjustable connecting head 5, the side of the casting template unit 1 connected to the adjustable connecting head 5 is the side where the two casting template units 1 are molded together, and a 1 / 2 through hole is provided on the side of each casting template unit 1, and a rubber sealing layer is provided on the inner side of the 1 / 2 through hole. The entire through hole is formed after the two casting template units 1 are molded together; this structure facilitates the recycling and reuse of the casting template unit 1, and at the same time, the sealing performance is further increased by providing the rubber sealing layer.

[0036] like Figure 8 , Fig. 9As shown, the lock buckle 4 includes a fixed seat 401, a through hole extending from left to right is opened on the fixed seat 401, a locking rod 402 is slidably connected in the through hole, the end of the locking rod 402 is arranged outside the fixed seat 401, a first clamping block 403 is arranged on the fixed seat 401, and a second clamping block 404 is arranged on the right end of the locking rod 402; a plurality of ratchet teeth 4021 are arranged on the locking rod 402 along the length direction of the locking rod 402; an adjusting groove is arranged on the fixed seat 401, the adjusting groove is connected with the through hole, a ratchet wheel 406 is rotatably connected in the adjusting groove, and the ratchet wheel 406 is meshed with the ratchet teeth 4021 on the locking rod 402, and A nut 407 is coaxially connected to the ratchet 406; a group of ratchet pawls 409 are symmetrically arranged on the left and right sides of the adjusting groove, two in a group, the ratchet pawls 409 are connected to the side walls of the adjusting groove through a spring 408, and the two ratchet pawls 409 can respectively limit the ratchet 406 from rotating in different directions; a paddle 4010 is rotatably connected between the two ratchet pawls 409 in the adjusting groove, which is used to paddle the ratchet pawl 409 to engage or disengage the ratchet 409 with the ratchet 406; one end of the rotating shaft of the paddle 4010 passes through the fixed seat 401, and a rotating handle 4011 is connected to the other end passing through the fixed seat 401.

[0037] Through the lock buckle 4, the connection of the two end connecting ribs 6, the connection of the two side connecting ribs 7, the connection of the two second longitudinal reinforcing ribs 2021, and the connection of the two avoidance grooves 2011 can be achieved; when in use, by rotating the rotating handle 4011, the end of the paddle 4010 is pressed on the left or right pawl 409, thereby realizing the unidirectional clockwise rotation of the ratchet 406, the second clamping block 404 is away from the first clamping block 403, and the release is realized, or the ratchet 406 is unidirectionally rotated counterclockwise, the second clamping block 404 is close to the first clamping block 403, and the clamping is realized. When rotating the ratchet 406, a wrench can be used to rotate the nut 407 coaxially connected to the ratchet 406. In order to facilitate the rotation of the wrench, an expansion slot 4022 is also processed on the lock rod 402.

[0038] Furthermore, a row of universal balls 405 may be provided in the through hole to facilitate the locking rod 402 to slide left and right.

[0039] The present invention can quickly assemble a cast-in-place mold for a double-limb column through the locking buckle 4, the casting template unit 1, the casting template unit 2 and the web casting mold 3, and cooperate with the locking buckle 4, thereby shortening the mold making and supporting time. After casting, the mold can be quickly separated, which not only improves the demolding efficiency, but also increases the frequency of mold use, thereby reducing production costs; at the same time, through the adjustable connecting head 5, it is possible to switch between flat webs and inclined webs of various angles, which has extremely strong adaptability; by setting a slidingly connected outer template 201 and an inner template 202, the height of the limb column mold assembled by the casting template unit 2 can be adjusted, and then the inclination angle of the web casting mold 3 of the upper layer can be adjusted, further increasing the adaptability range.

[0040] The above description is only the preferred embodiment of the present invention, and does not limit the scope of rights of the present invention. All equivalent changes made by using the contents of the present invention specification and its drawings are included in the scope of rights of the present invention.

Claims

1. A concrete double-column frame casting formwork, characterized in that: The limb column formwork on one side is formed by a plurality of groups of casting formwork units one (1) and a plurality of groups of casting formwork units two (2) arranged longitudinally, and a web casting mold (3) is connected between the limb column formworks on both sides; the casting formwork units one (1) and the casting formwork units two (2) both have a U-shaped cross-section, two identical casting formwork units form a group, and are fixed into a rectangular frame by means of a lock buckle (4), and the upper and lower adjacent groups are connected by means of a lock buckle (4); the end of the web casting mold (3) is connected to the casting formwork unit one (1) by means of an adjustable connector (5); The web casting mold (3) comprises an upper half pipe (301) and a lower half pipe (302), upper half flange connection plates are arranged at both ends of the upper half pipe (301), and lower half flange connection plates are arranged at both ends of the lower half pipe (302), the upper half pipe (301) and the lower half pipe (302) are buckled and fixed by a pipe clamp (9) to form a web casting pipe, the upper half flange connection plate and the lower half flange connection plate are spliced ​​to form a first flange connection plate (303), and both ends of the web casting pipe are connected to the adjustable connector (5) via the first flange connection plate (303); The adjustable connector (5) comprises a spherical air vent (501), a through hole adapted to the spherical air vent (501) is provided at a location on the casting template unit (1) where the spherical air vent (501) is connected, one end of the spherical air vent (501) is sealedly connected to the through hole on the casting template unit (1) via a sealing ring, the other end of the spherical air vent (501) is provided with a joint extension tube (502), and the end of the joint extension tube (502) is provided with a second flange connection plate (503) for connecting to the first flange connection plate (303); The casting template unit 2 (2) comprises an outer template (201) and an inner template (202), wherein the outer template (201) and the inner template (202) are connected in an upward and downward sliding manner; the sliding connection structure comprises: a plurality of second longitudinal reinforcing ribs (2021) are arranged at intervals on the outer wall of the inner template (202); an avoidance groove (211) is arranged on the outer template (201) corresponding to the second longitudinal reinforcing ribs (2021) on the inner template (202); the second longitudinal reinforcing ribs (221) are connected in an upward and downward sliding manner in the avoidance groove (211); first overhangs (222) for clamping the lock buckle (4) are arranged at the left and right edges of the inner template (202); and second overhangs (212) for clamping the lock buckle (4) are arranged at the left and right edges of the outer template (201).

2. A concrete double-column frame casting formwork according to claim 1, characterized in that: The outer sides of the upper and lower edges of the casting template unit 1 (1) and the casting template unit 2 (2) are both provided with end connecting ribs (6) for snapping the lock buckle (4); the outer sides of the edges of the casting template unit 1 (1) are both provided with side connecting ribs (7) for snapping the lock buckle (4).

3. A concrete double-column frame casting formwork according to claim 2, characterized in that: A plurality of first longitudinal reinforcing ribs (8) are also arranged at intervals on the outer side of the casting template unit 1 (1), and the two ends of the first longitudinal reinforcing ribs (8) are respectively connected to the end connecting ribs (6) on the outer sides of the upper edge and the lower edge.

4. A concrete double-column frame casting formwork according to claim 1, characterized in that: The outer side of the outer template (201) is also connected to a horizontally arranged outer support rod (203), the outer support rod (203) is in a U-shaped structure and is fixedly connected to the outer end surface of the avoidance groove (211) on the outer template (201); the outer side of the inner template (202) is also connected to a horizontally arranged adjustment rod (204), the adjustment rod (204) is in a U-shaped structure and is fixedly connected to the outer end surface of the second longitudinal reinforcement rib (221) on the inner template (202).

5. A concrete double-column frame casting formwork according to claim 1, characterized in that: Groove plates (2013) are arranged on two opposite sides of the avoidance groove (2011).

6. A concrete double-column frame casting formwork according to claim 1, characterized in that: It also includes a limiting rod (205) for limiting the sliding position of the inner template (202); the limiting rod (205) is in a U-shaped structure; a plurality of slots (2051) adapted to the second longitudinal reinforcing rib (221) are provided on the inner side of the limiting rod (205); after the limiting rod (205) is connected to the second longitudinal reinforcing rib (221) of the inner template (202) through the slots (2051), the inner side wall of the limiting rod (205) is in contact with the outer side wall of the inner template (202), and the lower end surface of the limiting rod (205) is in contact with the upper edge of the outer template (201).

7. A concrete double-column frame casting formwork according to claim 1, characterized in that: The lock buckle (4) comprises a fixing seat (401), the fixing seat (401) is provided with a through hole extending therethrough from left to right, a locking rod (402) is slidably connected in the through hole, an end of the locking rod (402) is arranged to pass through the fixing seat (401), a first clamping block (403) is arranged on the fixing seat (401), and a second clamping block (404) is arranged at the right end of the locking rod (402); A plurality of ratchet teeth (4021) are arranged on the locking rod (402) along the length of the locking rod (402); an adjustment slot is arranged on the fixing seat (401), the adjustment slot is communicated with the through hole, a ratchet wheel (406) is rotatably connected in the adjustment slot, the ratchet wheel (406) is meshed with the ratchet teeth (4021) on the locking rod (402), and a nut (407) is coaxially connected to the ratchet wheel (406); A group of ratchets (409) are symmetrically arranged on the left and right sides of the adjusting groove, with two ratchets (409) in one group. The ratchets (409) are connected to the side wall of the adjusting groove through a spring (408). The two ratchets (409) can respectively limit the ratchet wheel (406) from rotating in different directions. A paddle (4010) is rotatably connected between the two ratchet pawls (409) in the adjustment slot and is used to pry the ratchet pawls (409) so as to engage or disengage the ratchet pawls (409) with the ratchet wheel (406); One end of the rotating shaft of the paddle (4010) passes through the fixing seat (401), and a rotating handle (4011) is connected to the end passing through the fixing seat (401).

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