Lifting type elevator shaft formwork structure

Abstract

The utility model relates to the field of elevator shafts, in particular to a lifting type elevator shaft formwork structure which comprises two right vertical blocks and two left vertical blocks, and lower bearing blocks are fixedly connected between the corresponding right vertical blocks and the corresponding left vertical blocks on different sides. The motor drives the double-tooth screw to rotate so as to drive the two threaded sleeve blocks to move oppositely, the connecting rod pushes the movable plate to slide out along the limiting frame, the lower end of the movable plate is tightly attached to the top face of the lower bearing block, a bottom supporting point is formed, and then the L-shaped block slides to a preset position along the L-shaped groove body manually. The lower end of the upper half portion of the fixing frame makes contact with the top face of the upper bearing block to form a top supporting point, through double supporting of the movable plate and the L-shaped blocks, the dead weight of the device and construction loads are evenly transmitted to the right vertical blocks and the left vertical blocks at the four corners of the hoistway, and a stable four-point supporting system is formed. According to the structure, redundant materials are replaced by the telescopic parts, and the self weight is greatly reduced while the bearing capacity is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model belongs to elevator shaft field, concretely relates to hoist type elevator shaft template structure. BACKGROUND

[0002] With the urbanization process accelerates, the demand of high-rise and super high-rise building to elevator system surges, and the construction quality and efficiency of elevator shaft as the core structure of building vertical traffic directly influence the project progress and safety.

[0003] The existing hoist type template equipment is too heavy, which leads to the increase of hoisting cost, and the traditional shaft template is difficult to adjust quickly due to the limited adjustment range, and cannot adapt to the size requirement of the shaft in high-rise building, and it is difficult to improve the stability of the template in use. UTILITY MODEL CONTENTS

[0004] In order to overcome the problems of the existing hoist type template equipment, which is too heavy and leads to the increase of hoisting cost, and the traditional shaft template is difficult to adjust and has insufficient stability, therefore, the hoist type elevator shaft template structure is proposed.

[0005] The technical scheme of the utility model is: the hoist type elevator shaft template structure comprises two right vertical blocks and two left vertical blocks, the lower bearing blocks are fixedly connected between the right vertical blocks and the left vertical blocks on different sides and corresponding to each other, the upper bearing blocks are fixedly connected between the two right vertical blocks on the same side, and the upper bearing blocks are fixedly connected between the two left vertical blocks on the same side; the lower templates are slidably arranged between the two lower bearing blocks, the U-shaped blocks are fixedly connected to the inner walls of the lower templates, the two limiting frames are fixedly connected to the inner walls of the U-shaped blocks, the moving plates are slidably arranged in the limiting frames, the moving mechanism for moving the moving plates is arranged in the lower templates, and the lower ends of the moving plates are attached to the upper ends of the lower bearing blocks.

[0006] The upper ends of the lower templates are fixedly connected with the bearing plates, the steel columns are fixedly connected to the upper ends of the four corners of the upper ends of the bearing plates, and the upper templates are fixedly connected to the upper ends of the four steel columns.

[0007] The support mechanism is installed on the upper template, the support mechanism comprises an L-shaped block and a second threaded column, two first limiting grooves are formed in one side of the upper template, a second limiting groove is formed in the bottom surface of the upper template, the second limiting groove and the first limiting grooves form an L-shaped groove body, the inner wall of the L-shaped groove body is slidably provided with the L-shaped block, the lower end of one end of the L-shaped block close to the center of the upper template is fixedly connected with the second threaded column, and the lower end of the upper half of the L-shaped block is attached to the upper end of the upper bearing block.

[0008] The first locking mechanism and the second locking mechanism for locking the second threaded column are arranged on the upper template.

[0009] Further, the moving mechanism comprises a U-shaped block, two double-toothed screws, two threaded sleeve blocks and a connecting rod, two double-toothed screws are rotatably arranged on the inner wall of the U-shaped block, the screw threads on the outer wall of the double-toothed screws are opposite to each other, two threaded sleeve blocks are threadedly connected to the outer wall of the double-toothed screws and are matched with the screw threads, one end of the connecting rod is hingedly connected to one end of the threaded sleeve block away from the center of the U-shaped block, the other end of the connecting rod is hingedly connected to one end of the moving plate close to the center of the U-shaped block, two motors are fixedly connected to the side ends of the U-shaped block, and the output shafts of the motors penetrate through one side of the U-shaped block and are fixedly connected to one end of the double-toothed screws.

[0010] Further, the lower end of the upper mold plate is fixedly connected with a guide block, the first locking mechanism comprises a sliding block, a first threaded column and a nut, the side wall of the guide block is slidably provided with the sliding block, the two sides of the sliding block are fixedly connected with the first threaded columns, the side wall of the first threaded column is threadedly connected with the nut, and the nut is matched with the second threaded column.

[0011] Further, the second locking mechanism comprises a second electric cylinder, a pressing disc, a limiting block and a limiting groove, the lower end of the upper mold plate is fixedly connected with two limiting blocks, the limiting groove is arranged at the end of the limiting block away from the guide block, the side ends of the two L-shaped blocks are fixedly connected with the second electric cylinder in a penetrating mode, the output end of the second electric cylinder faces the guide block, the pressing disc is fixedly connected to the output shaft of the second electric cylinder, and the pressing disc is matched with the limiting groove.

[0012] Further, the lower end of the upper mold plate is fixedly connected with two fixing seats, the inner wall of the fixing seat is fixedly connected with the first electric cylinder, and the output shaft of the first electric cylinder is fixedly connected to one end of the sliding block close to the center of the guide block.

[0013] Further, the lower end of the upper mold plate is fixedly connected with a battery, the battery is electrically connected with the second electric cylinder, and the battery is electrically connected with the first electric cylinder.

[0014] Further, the left and right ends of the upper mold plate are fixedly connected with two guide wheels, any two guide wheels are symmetrical about the center of the upper mold plate, the end of the guide wheel away from the upper mold plate is flush with the end of the right vertical block away from the upper mold plate, and the end of the guide wheel away from the upper mold plate is flush with the end of the left vertical block away from the upper mold plate.

[0015] The utility model discloses the beneficial effects of:

[0016] 1、When the device needs to be fixed at the current construction height, the double-toothed screw rod is driven to rotate by the motor, thereby driving the two threaded sleeve blocks to move towards each other, the connecting rod pushes the moving plate to slide out of the limiting frame, the lower end of the moving plate is tightly attached to the top surface of the lower bearing block, a bottom support point is formed, then the L-shaped block is manually slid along the L-shaped groove body to a preset position, the lower end of the upper half of the L-shaped block is in contact with the top surface of the upper bearing block, a top support point is formed, through the double support of the moving plate and the L-shaped block, the dead weight and construction load of the device are evenly transmitted to the right vertical block and the left vertical block at the four corners of the shaft, a stable four-point support system is formed, compared with the traditional fixed frame, the structure replaces redundant materials with telescopic components, while ensuring the bearing capacity, the dead weight is greatly reduced;

[0017] 2、By setting two locking mechanisms, after the L-shaped block is in place, the first electric cylinder is started to move the sliding block, finally the first threaded column and the second threaded column are aligned, then the nut is manually rotated, the nut is threaded on the side wall of the first threaded column and the second threaded column at the same time, the second electric cylinder is started, the extrusion disc is pushed into the limiting groove on the limiting block, physical limiting is formed, the double locking mechanism not only prevents horizontal displacement of the L-shaped block, but also eliminates the vertical loosening hidden danger through the thread pre-tightening force and mechanical engagement, the stability of the L-shaped block after moving is improved;

[0018] 3、When it is necessary to move upwards, first, the moving mechanism is started in reverse, the double-toothed screw rod drives the threaded sleeve block to move back, the moving plate is retracted into the limiting frame through the connecting rod, the bottom support is released, the first locking mechanism and the second locking mechanism are released to limit the L-shaped block, the L-shaped block is reset by manual adjustment, the L-shaped block is separated from the upper bearing block, the top constraint is released, at this time, the upper template can be lifted to a new height by external lifting equipment, the fit of the guide wheel and the shaft wall ensures the stability of the lifting process, solves the problems of the existing lifting template equipment, such as the increase of hoisting cost caused by the large dead weight, and the problems of the traditional shaft template, such as the difficulty in telescopic adjustment and the insufficient stability. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 A three-dimensional structure schematic view of the utility model is shown;

[0020] Figure 2 A three-dimensional structure schematic view of the moving mechanism of the utility model is shown;

[0021] Figure 3 A three-dimensional structure schematic view of the motor of the utility model is shown;

[0022] Figure 4 A three-dimensional structure schematic view of the first electric cylinder of the utility model is shown;

[0023] Figure 5 A three-dimensional structure schematic view of the guide block of the utility model is shown;

[0024] Figure 6 The figure shows a three-dimensional split structure schematic diagram of the first threaded column and the nut of the utility model;

[0025] Figure 7 The figure shows a three-dimensional split structure schematic diagram of the upper mold plate and the L-shaped block of the utility model;

[0026] Figure 8 The figure shows a three-dimensional structure schematic diagram of the battery of the utility model.

[0027] The figure shows a three-dimensional split structure schematic diagram of the first threaded column and the nut of the utility model; Specific embodiments

[0028] The utility model will be further explained in connection with the drawings and examples.

[0029] Example 1: please refer to Figures 1-8 The utility model discloses a lifting type elevator shaft formwork structure, which comprises two right vertical blocks 1 and two left vertical blocks 2, the lower bearing blocks 3 are fixedly connected between the right vertical blocks 1 and the left vertical blocks 2 on different sides and corresponding to each other, the upper bearing blocks 4 are fixedly connected between the two right vertical blocks 1 on the same side, and the upper bearing blocks 4 are fixedly connected between the two left vertical blocks 2 on the same side; the lower mold plate 5 is slidably arranged between the two lower bearing blocks 3, the U-shaped block 51 is fixedly connected to the inner wall of the lower mold plate 5, the two limiting frames 55 are fixedly connected to the inner wall of the U-shaped block 51, the movable plate 56 is slidably arranged in the limiting frame 55, and the movable mechanism for moving the movable plate 56 is arranged in the lower mold plate 5; the lower end of the movable plate 56 is attached to the upper end of the lower bearing block 3.

[0030] The upper end of the lower mold plate 5 is fixedly connected with the bearing plate 6, the steel columns 7 are fixedly connected to the upper end of the four corners of the bearing plate 6, and the upper mold plate 8 is fixedly connected to the upper end of the four steel columns 7.

[0031] The upper die plate 8 is provided with a supporting mechanism, which comprises an L-shaped block 87 and a second threaded column 88; one side of the upper die plate 8 is provided with two first limiting grooves 85, and the bottom surface of the upper die plate 8 is provided with a second limiting groove 86; the second limiting groove 86 and the first limiting grooves 85 form an L-shaped groove body, and the inner wall of the L-shaped groove body is slidably provided with the L-shaped block 87; one end of the L-shaped block 87 close to the center of the upper die plate 8 is fixedly connected with the second threaded column 88 at the lower part; and the lower end of the upper half of the L-shaped block 87 is attached to the upper end of the upper bearing block 4.

[0032] The upper die plate 8 is provided with a supporting mechanism, which comprises an L-shaped block 87 and a second threaded column 88; one side of the upper die plate 8 is provided with two first limiting grooves 85, and the bottom surface of the upper die plate 8 is provided with a second limiting groove 86; the second limiting groove 86 and the first limiting grooves 85 form an L-shaped groove body, and the inner wall of the L-shaped groove body is slidably provided with the L-shaped block 87; one end of the L-shaped block 87 close to the center of the upper die plate 8 is fixedly connected with the second threaded column 88 at the lower part; and the lower end of the upper half of the L-shaped block 87 is attached to the upper end of the upper bearing block 4.

[0033] In use, two right vertical blocks 1 and two left vertical blocks 2 are installed at the four corners in the elevator shaft, the moving mechanism is turned on to move the moving plate 56 out of the inner wall of the limiting frame 55, so that the lower end of the moving plate 56 is attached to the upper end of the lower bearing block 3, the L-shaped block 87 is manually moved along the inner wall of the L-shaped groove body formed by the second limiting groove 86 and the first limiting grooves 85, so that the lower end of the upper half of the L-shaped block 87 is attached to the upper end of the upper bearing block 4, the weight of the entire device is then borne by the L-shaped block 87, so that the device is placed more stably, and then the first locking mechanism and the second locking mechanism are turned on to lock the L-shaped block 87; when it is needed to move the device upward, the moving mechanism is turned on to move the moving plate 56 to the inside of the limiting frame 55, so that the L-shaped block 87 is moved to the inside of the first limiting groove 85, the device can be quickly moved upward without the need for overall disassembly, the upper die plate 8 can be conveniently and quickly lifted by hoisting, and the construction efficiency of the elevator shaft is improved.

[0034] Please refer to Figure 1 and Figure 2 In this embodiment, the moving mechanism comprises a U-shaped block 51, two double-threaded screws 52, two threaded sleeve blocks 53 and a connecting rod 54; the inner wall of the U-shaped block 51 is rotatably provided with two double-threaded screws 52 on both sides; the thread teeth on the outer wall of the double-threaded screws 52 on both sides of the center are opposite to each other; the outer wall of the double-threaded screws 52 is threadedly provided with two threaded sleeve blocks 53 which are respectively matched with the two types of thread teeth; one end of the threaded sleeve blocks 53 away from the center of the U-shaped block 51 is hingedly connected with one end of the connecting rod 54, the other end of the connecting rod 54 is hingedly connected to one end of the moving plate 56 close to the center of the U-shaped block 51; the side end of the U-shaped block 51 is fixedly connected with two motors 57, the output shafts of the motors 57 pass through one side of the U-shaped block 51 and are fixedly connected to one end of the double-threaded screws 52; when it is needed to move the moving plate 56 out of the inner wall of the limiting frame 55, the motors 57 are turned on to rotate the double-threaded screws 52, the two threaded sleeve blocks 53 will move close to or away from each other, so as to move the moving plate 56, which is convenient for moving the moving plate 56 out of the limiting frame 55 or moving the moving plate 56 to the inner wall of the limiting frame 55 for temporary storage.

[0035] Please refer toFigure 1 、 Figure 5 and Figure 6 In the embodiment, the lower end of the upper die plate 8 is fixedly connected with a guide block 81, the first locking mechanism comprises a sliding block 82, a first threaded column 83 and a nut 84; the side wall of the guide block 81 is slidably provided with the sliding block 82, the two sides of the sliding block 82 are fixedly connected with the first threaded column 83, the side wall of the first threaded column 83 is threadedly provided with the nut 84, the nut 84 is matched with the second threaded column 88, manually rotating the nut 84 can make the nut 84 be threadedly provided on the side wall of the second threaded column 88 and the side wall of the first threaded column 83, so that the L-shaped block 87 can be positioned, thereby realizing stable placement of the L-shaped block 87.

[0036] Please refer to Figure 1 、 Figure 4 and Figure 5 In the embodiment, the lower end of the upper die plate 8 is fixedly connected with two fixing bases 9, the inner wall of the fixing base 9 is fixedly connected with the first electric cylinder 10, the output shaft of the first electric cylinder 10 is fixedly connected to one end of the sliding block 82 close to the center of the guide block 81, and opening the first electric cylinder 10 can quickly adjust the position of the sliding block 82.

[0037] Please refer to Figure 1 、 Figure 4 、 Figure 7 and Figure 8 In the embodiment, the lower end of the upper die plate 8 is fixedly connected with a storage battery 15, the storage battery 15 is electrically connected with the second electric cylinder 11, and the storage battery 15 is electrically connected with the first electric cylinder 10, so that the storage battery 15 can supply power to the first electric cylinder 10 and the second electric cylinder 11.

[0038] Please refer to Figure 1 In the embodiment, the left and right ends of the upper die plate 8 are fixedly connected with two guide wheels 16, any two guide wheels 16 are symmetrically arranged about the center of the upper die plate 8, the end of the guide wheel 16 away from the upper die plate 8 is flush with the end of the right vertical block 1 away from the upper die plate 8, and the end of the guide wheel 16 away from the upper die plate 8 is flush with the end of the left vertical block 2 away from the upper die plate 8, so that the guide wheel 16 can move along the inner wall of the shaft, which is beneficial to stable movement of the device.

[0039] Embodiment 2: Please refer to Figure 5On the basis of embodiment 1, the application provides a technical scheme: the second locking mechanism comprises a second electric cylinder 11, a pressing disc 12, a limiting block 13 and a limiting groove 14; the lower end of the upper die plate 8 is fixedly connected with two limiting blocks 13, the end of the limiting block 13 away from the guide block 81 is provided with a limiting groove 14, the side end of each of the two L-shaped blocks 87 is fixedly connected with the second electric cylinder 11 in a penetrating mode, the output end of the second electric cylinder 11 faces the guide block 81, the output shaft of the second electric cylinder 11 is fixedly connected with the pressing disc 12, and the pressing disc 12 is matched with the limiting groove 14; when it is needed to position and lock the position of the L-shaped block 87, the second electric cylinder 11 is started to make the pressing disc 12 enter the inner wall of the limiting groove 14, and the position of the L-shaped block 87 can be positioned.

[0040] Working principle: first, two right vertical blocks 1 and two left vertical blocks 2 are installed at four corners in the elevator shaft, when the device needs to be fixed at the current construction height, the motor 57 fixedly connected with the side end of the U-shaped block 51 is started, the output shaft of the motor 57 drives the double-toothed screw 52 to rotate, since the threads on the outer wall of the double-toothed screw 52 on the center and both sides are opposite to each other, the two thread sleeve blocks 53 fixedly connected with the two kinds of threads matched with the threads are moved towards each other, the thread sleeve blocks 53 push the moving plate 56 to slide out along the limiting frame 55 through the hinged connecting rod 54, so that the lower end of the moving plate 56 is tightly attached to the top surface of the lower bearing block 3, and a bottom support point is formed;

[0041] Then, the L-shaped block 87 is manually slid along the inner wall of the L-shaped groove formed by the second limiting groove 86 and the first limiting groove 85 to a preset position, so that the lower end of the upper half of the L-shaped block 87 is in contact with the top surface of the upper bearing block 4, and a top support point is formed;

[0042] Through the double support of the moving plate 56 and the L-shaped block 87, the dead weight and construction load of the device are evenly transmitted to the right vertical block 1 and the left vertical block 2 at four corners of the shaft, and a stable four-point support system is formed;

[0043] Then, the first electric cylinder 10 fixedly connected with the inner wall of the lower end fixed seat 9 of the upper die plate 8 is started, the output shaft of the first electric cylinder 10 pushes the sliding block 82 to slide along the side wall of the guide block 81, so that the first threaded column 83 and the L-shaped block 87 fixedly connected with the two sides of the sliding block 82 are aligned with the second threaded column 88 fixedly connected with the lower part of the center end of the upper die plate 8, and then the nut 84 is manually rotated to be threadedly connected to the side wall of the first threaded column 83 and the second threaded column 88;

[0044] Then, the second electric cylinder 11 fixedly connected with the side end of the L-shaped block 87 in a penetrating mode is started, the output shaft of the second electric cylinder 11 pushes the pressing disc 12 into the limiting groove 14 formed at the end of the limiting block 13 away from the guide block 81, and physical limiting is formed;

[0045] The double locking mechanism prevents horizontal displacement of the L-shaped block 87, eliminates the risk of loosening in the vertical direction through thread pre-tightening force and mechanical engagement, and improves the stability after the L-shaped block 87 moves;

[0046] When it is necessary to move the device upward, the motor 57 is started in reverse, the threaded sleeve block 53 is driven by the double-toothed screw rod 52 to move backward, the moving plate 56 is retracted into the limiting frame 55 through the connecting rod 54, and the bottom support is released;

[0047] Then manually release the locking of the first threaded column 83 and the second threaded column 88 by the nut 84, and release the limiting of the limiting groove 14 by the extrusion disc 12, manually adjust to reset the L-shaped block 87, so that it is separated from the upper bearing block 4 and the top constraint is released;

[0048] At this time, the upper mold plate 8 can be lifted to a new height by external lifting equipment, and the guide wheels 16 fixed at the left and right ends of the upper mold plate 8 are in close contact with the shaft wall, ensuring smooth and stable lifting without deviation.

Claims

1. A lifting elevator shaft formwork structure, comprising two right vertical blocks (1) and two left vertical blocks (2), with a lower bearing block (3) fixedly connected between corresponding right vertical blocks (1) and left vertical blocks (2) on different sides, an upper bearing block (4) fixedly connected between the two right vertical blocks (1) on the same side, and an upper bearing block (4) fixedly connected between the two left vertical blocks (2) on the same side; characterized in that: A lower template (5) is slidably placed between two lower bearing blocks (3). A U-shaped block (51) is fixed to the inner wall of the lower template (5). Two limiting frames (55) are fixed to the inner wall of the U-shaped block (51). A movable plate (56) is slidably placed on the inner wall of the limiting frame (55). A moving mechanism for moving the movable plate (56) is provided inside the lower template (5). The lower end of the movable plate (56) is attached to the upper end of the lower bearing block (3). The upper end of the lower template (5) is fixed with a bearing plate (6), and steel columns (7) are fixed at the four corners of the upper end of the bearing plate (6). The upper end of the four steel columns (7) is fixed with an upper template (8). A support mechanism is installed on the upper template (8). The support mechanism includes an L-shaped block (87) and a second threaded column (88). Two first limiting grooves (85) are opened through one side of the upper template (8). A second limiting groove (86) is opened through the bottom surface of the upper template (8). The second limiting groove (86) and the first limiting groove (85) form an L-shaped groove. An L-shaped block (87) is slidably provided on the inner wall of the L-shaped groove. A second threaded column (88) is fixedly connected to the lower part of one end of the L-shaped block (87) near the center of the upper template (8). The lower end of the upper half of the L-shaped block (87) is attached to the upper end of the upper bearing block (4). The upper template (8) is provided with a first locking mechanism and a second locking mechanism for locking the second threaded post (88).

2. The elevator shaft formwork structure according to claim 1, characterized in that: The moving mechanism includes a U-shaped block (51), a double-threaded screw (52), a threaded sleeve (53), and a connecting rod (54). Two double-threaded screws (52) are rotatably mounted on both sides of the inner wall of the U-shaped block (51). The threads on the outer walls of the double-threaded screws (52) located on both sides of the center are opposite to each other. Two threaded sleeves (53) that are respectively adapted to the two types of threads are installed on the outer walls of the double-threaded screws (52). One end of the threaded sleeve (53) away from the center of the U-shaped block (51) is hinged to one end of the connecting rod (54). The other end of the connecting rod (54) is hinged to one end of the moving plate (56) near the center of the U-shaped block (51). Two motors (57) are fixedly connected to the side end of the U-shaped block (51). The output shaft of the motor (57) passes through one side of the U-shaped block (51) and is fixedly connected to one end of the double-threaded screw (52).

3. The elevator shaft formwork structure according to claim 1, characterized in that: The lower end of the upper template (8) is fixedly connected to a guide block (81). The first locking mechanism includes a slider (82), a first threaded post (83), and a nut (84). The guide block (81) is slidably provided with a slider (82) on its side wall. The slider (82) is fixedly connected to both sides of the first threaded post (83). The first threaded post (83) is threadedly installed with a nut (84) on its side wall. The nut (84) is compatible with the second threaded post (88).

4. The elevator shaft formwork structure according to claim 1, characterized in that: The second locking mechanism includes a second electric cylinder (11), a pressing plate (12), a limiting block (13), and a limiting groove (14); two limiting blocks (13) are fixedly connected to the lower end of the upper template (8), and a limiting groove (14) is opened at the end of the limiting block (13) away from the guide block (81). The side ends of the two L-shaped blocks (87) are both fixedly connected to the second electric cylinder (11), the output end of the second electric cylinder (11) faces the guide block (81), and the pressing plate (12) is fixedly connected to the output shaft of the second electric cylinder (11). The pressing plate (12) and the limiting groove (14) are compatible.

5. The elevator shaft formwork structure according to claim 1, characterized in that: The lower end of the upper template (8) is fixedly connected to two fixed seats (9). The inner wall of the fixed seat (9) is fixedly connected to a first electric cylinder (10). The output shaft of the first electric cylinder (10) is fixedly connected to one end of the slider (82) near the center of the guide block (81).

6. The elevator shaft formwork structure according to claim 5, characterized in that: A storage battery (15) is fixedly connected to the lower end of the upper template (8). The storage battery (15) is electrically connected to the second electric cylinder (11), and the storage battery (15) is electrically connected to the first electric cylinder (10).

7. The elevator shaft formwork structure according to claim 1, characterized in that: Two guide wheels (16) are fixed to both the left and right ends of the upper template (8). Any two guide wheels (16) are symmetrical about the center of the upper template (8). The end of the guide wheel (16) away from the upper template (8) is flush with the end of the right vertical block (1) away from the upper template (8). The end of the guide wheel (16) away from the upper template (8) is flush with the end of the left vertical block (2) away from the upper template (8).

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