Building construction formwork with adjustable internal space

Abstract

The invention belongs to the technical field of building construction, and particularly relates to a building construction template capable of adjusting internal space, which comprises a base, a plurality of right-angle plates are arranged above the base, the plurality of right-angle plates are connected through a connecting seat, the plurality of right-angle plates and the connecting seat enclose a square, a moving mechanism is arranged on the base, and the moving mechanism is arranged on the base. The moving mechanism is used for driving the right-angle plate to move so as to change the size of a square area formed by the right-angle plate; the moving mechanism comprises a mounting disc, a plurality of fixed rails are arranged on the edge of the mounting disc, push rods are slidably connected into the fixed rails and connected with the right-angle plate, and a driving unit is arranged on the mounting disc and used for driving the push rods to move; a moving plate is fixedly connected to the right-angle plate, and a mounting mechanism is arranged between the right-angle plate and the connecting seat; through the structural cooperation, the size of the formwork can be changed, so that the adaptability of the formwork is improved, and in addition, the formwork is convenient to disassemble.

Description

Technical Field

[0001] The invention belongs to the technical field of building construction, in particular to a building construction template with adjustable internal space. Background Art

[0002] In building construction, a construction formwork is usually used to form the required casting cavity, and then concrete is poured into the cavity to form the required building structure. The construction formwork plays a role in assisting the forming.

[0003] Most of the existing construction formworks are fixed in form, and the formworks are fixed together by nails or bolts. It is difficult to change the position of the formwork to adapt to the size of the wall according to the size of the building, such as the length and width of the wall, resulting in poor adaptability of the formwork. In addition, since it is fixed by nails or bolts, it is time-consuming and laborious to remove the formwork, and the nails need to be pulled out one by one to remove the formwork.

[0004] To this end, the present invention provides a building construction template with adjustable internal space. Summary of the invention

[0005] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0006] The technical solution adopted by the present invention to solve its technical problems is: the present invention describes a construction template with adjustable internal space, comprising a base, a plurality of right-angle plates are arranged above the base, the plurality of right-angle plates are connected by a connecting seat, the plurality of right-angle plates and the connecting seat form a square, the base is provided with a moving mechanism, the moving mechanism is used to drive the right-angle plates to move so as to change the size of the square area formed by the right-angle plates; the moving mechanism comprises a mounting plate, a plurality of fixed rails are arranged on the edge of the mounting plate, a push rod is slidably connected to the fixed rail, the push rod is connected to the right-angle plate, the mounting plate is provided with a driving unit, the driving unit is used to drive the plurality of push rods to move; a moving plate is fixedly connected to the right-angle plate, the moving plate slidably extends into the connecting seat, a mounting mechanism is arranged between the right-angle plate and the connecting seat, the mounting mechanism is used to fix the connecting seat and the right-angle plate.

[0007] The driving unit includes a rotating shaft, which is rotatably connected to the base, and the rotating shaft is movably connected to the mounting plate. A rotating rod is fixedly connected to the rotating shaft, and the rotating rod is located in the mounting plate. Both ends of the rotating rod are rotatably connected to transmission rods, and one end of the transmission rod away from the rotating rod is rotatably connected to a moving frame, and the push rod is slidably connected in the moving frame.

[0008] A positioning groove is provided in the movable frame, the push rod is slidably connected to the positioning groove, and the middle part of the rotating rod is fixedly connected to the rotating shaft.

[0009] The driving unit also includes an active bevel gear, which is fixedly connected to the end of the rotating shaft and located in the base. A connecting rod is rotatably connected in the base, and a driven bevel gear is fixedly connected to the connecting rod. The active bevel gear is meshed with the driven bevel gear.

[0010] The base is provided with a braking mechanism for controlling the start and braking of the moving mechanism. The braking mechanism comprises a fixed chuck which is fixedly connected to a connecting rod, a moving chuck is slidably connected to the connecting rod, and the moving chuck corresponds to the fixed chuck.

[0011] The braking mechanism also includes a connecting frame, which is fixedly connected to the movable chuck, a trapezoidal plate is slidably connected to the inner wall of the base, the trapezoidal plate and the connecting frame are slidably connected, a slot is provided on the connecting frame, the trapezoidal plate and the connecting frame are slidably connected through the slot, a threaded rod is threadedly connected to the base, one end of the threaded rod extends into the base and is rotatably connected to the trapezoidal plate, and the other end of the threaded rod is fixedly extended to the outside of the base and is fixedly connected to a turntable.

[0012] A first spring is sleeved on the connecting rod, and the first spring is connected to the movable chuck. A limiting groove is provided on the connecting rod, and the movable chuck is slidably connected in the limiting groove. A strip groove is provided inside the base, and the trapezoidal plate is slidably connected to the strip groove.

[0013] A rotating mechanism is provided on the base, and the rotating mechanism is used to drive the connecting rod to rotate. The rotating mechanism includes a positioning seat, and the positioning seat is fixedly connected to the base. The connecting rod passes through the positioning seat, and a rocker rod is fixedly connected to the connecting rod. The rocker rod is located in the positioning seat. An arc groove is opened on the positioning seat, and a moving rod is fixedly connected to the rocker rod. The moving rod passes through the arc groove and is threadedly connected with a nut.

[0014] A fan-shaped plate is fixedly connected to the inner wall of the right-angle plate, a plug rod is inserted into the fan-shaped plate, and the plug rod passes through the push rod.

[0015] The mounting mechanism includes a square rail, which is fixedly connected to a right-angle plate, a limited seat fixedly connected to the connecting seat, a pull rod on the positioning seat, a connecting head fixedly connected to the pull rod, a second spring sleeved on the pull rod, the two ends of the second spring are respectively connected to the limited seat and the connecting head, a sliding rod is slidably connected in the fixed rail, a square rod is rotatably connected between the sliding rod and the connecting head, a limited rail is arranged on the connecting seat, and the limited rail and the sliding rod are slidably connected.

[0016] The beneficial effects of the present invention are as follows: through the cooperation of the provided moving mechanism and the braking mechanism, the size of the building construction template can be adjusted according to the required building wall size, thereby improving the adaptability of the building construction template, and the provided braking mechanism can brake the moving mechanism, thereby preventing the building construction template from moving during pouring, thereby preventing the building construction template from not meeting the required size; The cooperation of the fan-shaped plate, the plug rod and the installation mechanism can realize the rapid disassembly and installation of the base, the right-angle plate and the connecting seat, thereby facilitating the rapid demoulding of the construction formwork after the wall is formed, and the rapid installation of the construction formwork. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below in conjunction with the accompanying drawings.

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 The present invention Figure 1 The enlarged structural diagram at A in the middle; Figure 3 It is a schematic diagram of the structure of the mobile mechanism part in the present invention; Figure 4 It is a schematic diagram of the internal structure of the installation disk in the present invention; Figure 5 It is a schematic diagram of the braking mechanism in the present invention; Figure 6 It is a partial structural schematic diagram of the braking mechanism in the present invention; Figure 7 It is a schematic diagram of the rotating mechanism in the present invention; Figure 8 It is a schematic diagram of the positioning seat structure in the present invention; Fig. 9 It is a structural schematic diagram of the fan-shaped plate and the plug rod in the present invention; Fig.10 It is a schematic diagram of the cooperation between the movable plate and the connecting seat in the present invention.

[0019] In the figure: 1, base; 2, right angle plate; 3, connecting seat; 4, moving mechanism; 41, mounting plate; 42, fixed rail; 43, push rod; 44, rotating rod; 45, transmission rod; 46, moving frame; 47, rotating shaft; 401, driven bevel gear; 402, driving bevel gear; 403, connecting rod; 5, braking mechanism; 51, fixed chuck; 52, movable chuck; 53, connecting frame; 54, first spring; 55, trapezoidal plate; 56, strip groove; 57, threaded rod; 58, turntable; 59, limit groove; 6, rotating mechanism; 61, positioning seat; 62, arc groove; 63, movable rod; 64, nut; 65, rocker arm; 7, sector plate; 8, plug rod; 9, mounting mechanism; 91, square rail; 92, pull rod; 93, limit seat; 94, second spring; 95, connector; 96, square rod; 97, slide rod; 98, limit rail; 10, movable plate. DETAILED DESCRIPTION

[0020] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0021] Embodiment 1 like Figures 1 to 10 As shown, a construction template with adjustable internal space according to an embodiment of the present invention comprises a base 1, a plurality of right-angle plates 2 are arranged above the base 1, the plurality of right-angle plates 2 are connected by a connecting seat 3, the plurality of right-angle plates 2 and the connecting seat 3 form a square, a moving mechanism 4 is arranged on the base 1, the moving mechanism 4 is used to drive the right-angle plates 2 to move so as to change the size of the square area formed by the right-angle plates 2; the moving mechanism 4 comprises a mounting plate 41, a plurality of fixed rails 42 are arranged on the edge of the mounting plate 41, a push rod 43 is slidably connected in the fixed rail 42, the push rod 43 is connected to the right-angle plate 2, a driving unit is arranged on the mounting plate 41, the driving unit is used to drive the plurality of push rods 43 to move, a moving plate 10 is fixedly connected to the right-angle plate 2, both ends of the connecting seat 3 are openings, the moving plate 10 slides and extends into the opening of the connecting seat 3, a plurality of beveled plates are arranged on the base 1, the right-angled plates 2 are slidably connected to the beveled plates, and the interior of the right-angled plates 2 is a hollow structure.

[0022] The right-angle plate 2 and the connecting seat 3 cooperate to form a construction template cavity. A wall can be formed by pouring concrete into the cavity formed by the right-angle plate 2. The movable mechanism 4 is provided to drive each right-angle plate 2 to move, so that the right-angle plate 2 drives the movable plate 10 to slide in the connecting seat 3, thereby changing the size of the internal space enclosed by the right-angle plates 2.

[0023] like Figure 3 to Figure 4 As shown, the driving unit includes a rotating shaft 47, which is rotatably connected to the base 1, and the rotating shaft 47 is movably connected to the mounting plate 41. A rotating rod 44 is fixedly connected to the rotating shaft 47, and the rotating rod 44 is located in the mounting plate 41. Both ends of the rotating rod 44 are rotatably connected to a transmission rod 45, and one end of the transmission rod 45 away from the rotating rod 44 is rotatably connected to a moving frame 46, and the push rod 43 is slidably connected in the moving frame 46.

[0024] like Figures 4 to 5 As shown, a positioning groove is provided in the movable frame 46 , the push rod 43 is slidably connected to the positioning groove, and the middle part of the rotating rod 44 is fixedly connected to the rotating shaft 47 .

[0025] like Figure 5 As shown, the drive unit also includes a driven bevel gear 401, which is fixedly connected to the end of the rotating shaft 47 and located in the base 1. A connecting rod 403 is rotatably connected in the base 1, and a driving bevel gear 402 is fixedly connected to the connecting rod 403. The driven bevel gear 401 and the driving bevel gear 402 are meshed.

[0026] The action process of the moving mechanism 4 is to first rotate the connecting rod 403, thereby driving the active bevel gear 402 on the connecting rod 403 to rotate. Since the active bevel gear 402 is meshed with the driven bevel gear 401, the driven bevel gear 401 is driven to rotate, thereby driving the rotating shaft 47 fixedly connected to the driven bevel gear 401 to rotate, and then driving the rotating rod 44 on the rotating shaft 47 to rotate. The rotation of the rotating rod 44 further drives the transmission rod 45 to rotate, and the transmission rod 45 drives the moving frame 46 to move. The moving frame 46 further drives the push rod 43 slidably connected thereto to move, thereby finally driving the right angle plate 2 to move, and then changing the size of the internal space formed by the entire right angle plate 2.

[0027] like Figures 5 and 6 As shown, a brake mechanism 5 is provided on the base 1, and the brake mechanism 5 is used to control the start and braking of the moving mechanism 4. The brake mechanism 5 includes a fixed chuck 51, and the fixed chuck 51 is fixedly connected to the connecting rod 403. The connecting rod 403 is slidably connected with a moving chuck 52, and the moving chuck 52 corresponds to the fixed chuck 51.

[0028] By moving the movable chuck 52 in the above technical solution, the movable chuck 52 and the fixed chuck 51 are matched, so that the teeth on the movable chuck 52 are meshed with the teeth on the fixed chuck 51, the connecting rod 403 can be stopped from rotating.

[0029] like Figures 5 and 6 As shown, the braking mechanism 5 also includes a connecting frame 53, which is fixedly connected to the movable chuck 52, a trapezoidal plate 55 is slidably connected to the inner wall of the base 1, the trapezoidal plate 55 and the connecting frame 53 are slidably connected, a card slot is opened on the connecting frame 53, the trapezoidal plate 55 and the connecting frame 53 are slidably connected through the card slot, a threaded rod 57 is threadedly connected to the base 1, one end of the threaded rod 57 extends into the base 1 and is rotatably connected to the trapezoidal plate 55, and the other end of the threaded rod 57 is fixedly extended to the outside of the base 1 and is fixedly connected to a turntable 58.

[0030] The braking mechanism 5 is used to position the moving mechanism 4. When the moving mechanism 4 drives the right-angle plate 2 to move to a specified position, that is, when the size formed between the right-angle plates 2 needs to be fixed, the moving mechanism 4 is fixed by the braking mechanism 5 to prevent the moving mechanism 4 from moving, thereby changing the size of the internal space formed by the right-angle plate 2.

[0031] The action process of the braking mechanism 5 is to first rotate the turntable 58, which further drives the threaded rod 57 to rotate, and the threaded rod 57 further drives the trapezoidal plate 55 rotatably connected thereto to move, so that the hypotenuse of the trapezoidal plate 55 squeezes the connecting frame 53, and the connecting frame 53 pushes the mobile chuck 52 connected thereto to move along the limiting groove 59 opened on the connecting rod 403, and finally cooperates with the fixed chuck 51, and finally fixes the connecting rod 403, thereby achieving braking of the mobile mechanism 4.

[0032] like Figures 5 and 6 As shown, a first spring 54 is sleeved on the connecting rod 403, and the first spring 54 is connected to the movable chuck 52. The first spring 54 is used to stretch the movable chuck 52 so that it does not cooperate with the fixed chuck 51 under normal conditions. A limiting groove 59 is provided on the connecting rod 403, and the movable chuck 52 is slidably connected in the limiting groove 59. A strip groove 56 is provided on the inside of the base 1, and the trapezoidal plate 55 is slidably connected to the strip groove 56.

[0033] like Figures 7 and 8 As shown, a rotating mechanism 6 is provided on the base 1, and the rotating mechanism 6 is used to drive the connecting rod 403 to rotate. The rotating mechanism 6 includes a positioning seat 61, and the positioning seat 61 is fixedly connected to the base 1. The connecting rod 403 passes through the positioning seat 61, and a rocker rod 65 is fixedly connected to the connecting rod 403. The rocker rod 65 is located in the positioning seat 61, and an arc groove 62 is opened on the positioning seat 61. A moving rod 63 is fixedly connected to the rocker rod 65, and the moving rod 63 passes through the arc groove 62 and is threadedly connected with a nut 64.

[0034] The rotating mechanism 6 is used to control the rotation of the connecting rod 403. The moving rod 63 is rotated by toggling the moving rod 63, and the moving rod 63 further drives the rocker rod 65 to rotate in the positioning seat 61. The rocker rod 65 drives the connecting rod 403 fixedly connected thereto to rotate. After moving to a suitable position, the positioning of the moving rod 63 is completed by tightening the nut 64, and then the fixing of the connecting rod 403 is completed by the positioning of the moving rod 63.

[0035] Embodiment 2 like Figures 8 to 10As shown, compared with Example 1, another embodiment of the present invention is: a mounting mechanism 9 is arranged between the right-angle plate 2 and the connecting seat 3, the mounting mechanism 9 is used to fix the connecting seat 3 and the right-angle plate 2, a fan-shaped plate 7 is fixedly connected to the inner wall of the right-angle plate 2, a plug rod 8 is inserted into the fan-shaped plate 7, the plug rod 8 passes through the push rod 43, the fan-shaped plate 7 is located above the push rod 43, and multiple fan-shaped plates 7 are located on the same vertical line. Through the cooperation of the arranged fan-shaped plate 7 and the plug rod 8, the push rod 43 and the right-angle plate 2 can be connected, and the right-angle plate 2 and the push rod 43 can be conveniently disassembled.

[0036] like Figure 2 , Fig.10 As shown, the mounting mechanism 9 includes a square rail 91, which is fixedly connected to the right-angle plate 2, a limit seat 93 is fixedly connected to the connecting seat 3, a pull rod 92 is slidably connected to the limit seat 93, a connecting head 95 is fixedly connected to the pull rod 92, a second spring 94 is sleeved on the pull rod 92, and the two ends of the second spring 94 are respectively connected to the limit seat 93 and the connecting head 95, a sliding rod 97 is slidably connected in the square rail 91, a square rod 96 is rotatably connected between the sliding rod 97 and the connecting head 95, a limit rail 98 is arranged on the connecting seat 3, and the limit rail 98 and the sliding rod 97 are slidably connected.

[0037] The provided mounting mechanism 9 is used for connecting the connecting seat 3 and the right-angle plate 2, and it is very convenient to disassemble and install the connecting seat 3 and the right-angle plate 2 through the mounting mechanism 9. When disassembly is required, pull the pull rod 92, and at this time the pull rod 92 drives the connecting head 95 to move, and the connecting head 95 further drives the square rod 96 connected thereto to rotate. As the square rod 96 rotates, the sliding rod 97 connected thereto is driven to slide in the square rail 91. When the sliding rod 97 moves out of the square rail 91, the connecting seat 3 and the right-angle plate 2 can be separated.

[0038] Working principle: Before pouring, the right-angle plate 2 is placed above the base 1, and the beveled edges of the right-angle plate 2 and the base 1 slide, and then the right-angle plate 2 and the connecting seat 3 are installed together through the installation mechanism 9, and then the right-angle plate 2 is driven to move by the rotating mechanism 6 and the moving mechanism 4, so as to control the distance between each right-angle plate 2 according to the required internal space size. The braking mechanism 5 is used to position the moving mechanism 4. When the moving mechanism 4 drives the right-angle plate 2 to move to a suitable position, the braking mechanism 5 is used to brake the moving mechanism 4 to avoid movement when pouring the cavity inside the right-angle plate 2, which results in a size different from the required size. When demolding, the base 1, the right-angle plate 2 and the connecting seat 3 can be quickly disassembled through the cooperation of the installation mechanism 9, the fan-shaped plate 7 and the insertion rod 8.

[0039] The above-mentioned front, back, left, right, top and bottom are all based on the figures in the specification. Figure 1As a benchmark, according to the person's observation perspective, the side of the device facing the observer is defined as the front, the left side of the observer is defined as the left, and so on.

[0040] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the scope of protection of the present invention.

[0041] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A building construction template with adjustable internal space, comprising a base (1), characterized in that: A plurality of right-angle plates (2) are arranged above the base (1); the plurality of right-angle plates (2) are connected via a connecting seat (3); the plurality of right-angle plates (2) and the connecting seat (3) form a square; and a moving mechanism (4) is arranged on the base (1) for driving the right-angle plates (2) to move so as to change the size of the square area formed by the right-angle plates (2); The moving mechanism (4) comprises a mounting plate (41), a plurality of fixed rails (42) are arranged at the edge of the mounting plate (41), a push rod (43) is slidably connected inside the fixed rail (42), the push rod (43) is connected to the right-angle plate (2), and a driving unit is arranged on the mounting plate (41), the driving unit is used to drive the plurality of push rods (43) to move; A movable plate (10) is fixedly connected to the right-angle plate (2), and the movable plate (10) slides and extends into the connecting seat (3). A mounting mechanism (9) is provided between the right-angle plate (2) and the connecting seat (3), and the mounting mechanism (9) is used to fix the connecting seat (3) and the right-angle plate (2).

2. The building construction template with adjustable internal space according to claim 1, characterized in that: The driving unit comprises a rotating shaft (47), the rotating shaft (47) being rotatably connected to the base (1), the rotating shaft (47) being movably connected to the mounting plate (41), the rotating shaft (47) being fixedly connected to a rotating rod (44), the rotating rod (44) being located in the mounting plate (41), both ends of the rotating rod (44) being rotatably connected to transmission rods (45), one end of the transmission rod (45) away from the rotating rod (44) being rotatably connected to a moving frame (46), and the push rod (43) being slidably connected in the moving frame (46).

3. The building construction template with adjustable internal space according to claim 2, characterized in that: A positioning groove is provided in the movable frame (46), the push rod (43) is slidably connected to the positioning groove, and the middle portion of the rotating rod (44) is fixedly connected to the rotating shaft (47).

4. The building construction template with adjustable internal space according to claim 1, characterized in that: The drive unit further comprises a driven bevel gear (401), the driven bevel gear (401) being fixedly connected to the end of the rotating shaft (47) and located in the base (1), a connecting rod (403) being rotatably connected in the base (1), a driving bevel gear (402) being fixedly connected to the connecting rod (403), and the driven bevel gear (401) and the driving bevel gear (402) being meshed.

5. The building construction template with adjustable internal space according to claim 1, characterized in that: The base (1) is provided with a braking mechanism (5), the braking mechanism (5) being used to control the start and braking of the moving mechanism (4), the braking mechanism (5) comprising a fixed chuck (51), the fixed chuck (51) being fixedly connected to a connecting rod (403), a moving chuck (52) being slidably connected to the connecting rod (403), the moving chuck (52) corresponding to the fixed chuck (51).

6. The building construction template with adjustable internal space according to claim 5, characterized in that: The braking mechanism (5) further comprises a connecting frame (53), wherein the connecting frame (53) is fixedly connected to the movable chuck (52), a trapezoidal plate (55) is slidably connected to the inner wall of the base (1), the trapezoidal plate (55) and the connecting frame (53) are slidably connected, a card slot is provided on the connecting frame (53), the trapezoidal plate (55) and the connecting frame (53) are slidably connected via the card slot, a threaded rod (57) is threadedly connected to the base (1), one end of the threaded rod (57) extends into the base (1) and is rotatably connected to the trapezoidal plate (55), and the other end of the threaded rod (57) is fixedly extended to the outside of the base (1) and is fixedly connected to a rotating disk (58).

7. The building construction template with adjustable internal space according to claim 6, characterized in that: A first spring (54) is sleeved on the connecting rod (403), the first spring (54) is connected to the movable chuck (52), a limiting groove (59) is provided on the connecting rod (403), the movable chuck (52) is slidably connected in the limiting groove (59), a strip groove (56) is provided inside the base (1), and the trapezoidal plate (55) is slidably connected to the strip groove (56).

8. The building construction template with adjustable internal space according to claim 1, characterized in that: The base (1) is provided with a rotating mechanism (6), the rotating mechanism (6) being used to drive the connecting rod (403) to rotate, the rotating mechanism (6) comprising a positioning seat (61), the positioning seat (61) being fixedly connected to the base (1), the connecting rod (403) passing through the positioning seat (61), a swing rod (65) being fixedly connected to the connecting rod (403), the swing rod (65) being located in the positioning seat (61), the positioning seat (61) being provided with an arc groove (62), a moving rod (63) being fixedly connected to the swing rod (65), the moving rod (63) passing through the arc groove (62) and being threadedly connected to a nut (64).

9. The building construction template with adjustable internal space according to claim 1, characterized in that: A sector plate (7) is fixedly connected to the inner wall of the right-angle plate (2), an insertion rod (8) is inserted into the sector plate (7), and the insertion rod (8) passes through the push rod (43).

10. The building construction template with adjustable internal space according to claim 1, characterized in that: The mounting mechanism (9) comprises a square rail (91), wherein the square rail (91) is fixedly connected to the right-angle plate (2), a limit seat (93) is fixedly connected to the connection seat (3), a pull rod (92) is slidably connected to the limit seat (93), a connecting head (95) is fixedly connected to the pull rod (92), a second spring (94) is sleeved on the pull rod (92), two ends of the second spring (94) are respectively connected to the limit seat (93) and the connecting head (95), a sliding rod (97) is slidably connected inside the square rail (91), a square rod (96) is rotatably connected between the sliding rod (97) and the connecting head (95), and a limit rail (98) is arranged on the connection seat (3), and the limit rail (98) and the sliding rod (97) are slidably connected.

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