Transmission mechanism of steel bar bender

Abstract

The utility model discloses a steel bar bender transmission mechanism which comprises a motor, an output shaft of the motor is connected with a rotating shaft through a coupler, one end of the rotating shaft is connected with a fixing disc, first limiting teeth are annularly and evenly fixed to the outer wall of one side of the fixing disc, and a threaded rod is fixed to the center of the outer wall of one side of the fixing disc. A mounting block is in threaded connection with one end of the threaded rod, a cavity is formed in the side, opposite to the fixing disc, of the mounting block, second limiting teeth are slidably connected to the inner wall of the cavity, the bottom faces of the second limiting teeth are inclined faces, and the second limiting teeth are in sliding fit with the first limiting teeth; a limiting spring is fixed to the outer wall of one end of the second limiting tooth, a driving gear is fixed to the rotating shaft, and one side of the driving gear is in transmission engagement with a driven gear. Through the arrangement of the fixing disc, the first limiting teeth, the second limiting teeth, the limiting spring and the cavity, the rotating shaft cannot rotate after rotating for a certain number of circles, and overrun protection of the device is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of civil air defense doors, in particular to a transmission mechanism of a steel bar bending machine. Background Art

[0002] Civil air defense projects refer to underground protective buildings built separately to ensure the sheltering of personnel and materials, civil air defense command, and medical rescue in wartime, as well as basements built in combination with ground buildings that can be used for air defense in wartime. Civil air defense doors are the doors at the entrances and exits of civil air defense projects. During the production process of civil air defense doors, the steel bars need to be bent according to needs.

[0003] After searching, the Chinese patent publication number is CN 205684622 U's patent discloses an automatic bending machine for processing civil air defense steel bars, including a frame, a roller, a turntable, a splint, a sliding guide rail, and a guide wheel fixing seat. A workbench is fixed on the frame, a lower bearing is fixed on the lower part of the frame, an upper bearing is fixed on the workbench, the lower end of the roller is arranged in the lower bearing and the upper part thereof is arranged in the upper bearing, the top end of the roller is located above the workbench, the turntable is fixed to the top end of the roller, a first cylinder is fixed above the turntable and a second cylinder is fixed below the turntable, the upper end of the splint is fixed to the end of the piston rod of the first cylinder and the lower end thereof is fixed to the end of the piston rod of the second cylinder; the guide wheel fixing seat is fixed on the workbench and is located on one side of the turntable, a conveying guide wheel is fixed on the guide wheel fixing seat along the feeding direction of the steel bars; the sliding guide rail is fixed on the workbench and is parallel to the feeding direction of the steel bars, a third cylinder is slidably arranged on the sliding guide rail, and the piston rod end of the third cylinder is connected to the limit plate.

[0004] This patent can automatically control the length of the front end of the steel bar bending section by setting a third cylinder and a limit plate, and has high working efficiency. However, during the bending process, the turntable of this patent continues to rotate. When the steel bar is bent to a certain angle, if there is a problem with the device, the bending cannot be stopped in time, causing the workpiece to be over-bent and scrapped, and the steel bar may break, threatening the safety of workers. Utility Model Content

[0005] The utility model aims to solve the shortcomings in the prior art and proposes a transmission mechanism for a steel bar bending machine.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A transmission mechanism of a steel bar bending machine comprises a motor, wherein the motor output shaft is connected to a rotating shaft through a coupling, one end of the rotating shaft is connected to a fixed disk, a limiting tooth 1 is evenly fixed on the outer wall of one side of the fixed disk in an annular shape, a threaded rod is fixed at the center of the outer wall of one side of the fixed disk, one end of the threaded rod is threadedly connected to a mounting block, a cavity is provided inside the mounting block on the side opposite to the fixed disk, the inner wall of the cavity is slidably connected to a limiting tooth 2, the bottom surface of the limiting tooth 2 is an inclined surface, the limiting tooth 2 is slidably matched with the limiting tooth 1, a limiting spring is fixed to the outer wall of one end of the limiting tooth 2, and one end of the limiting spring is connected to the inner wall of the cavity.

[0008] As a further solution of the utility model: a driving gear is fixed on the rotating shaft, and a driven gear is transmission-engaged with one side of the driving gear.

[0009] As a further solution of the utility model: a sliding cavity is relatively opened at one end of the mounting block away from the fixed plate, a limiting plate is slidably connected inside the sliding cavity, and a fixing rod is connected to the outer wall of the top surface of the limiting plate.

[0010] As a further solution of the utility model: the coupling comprises a coupling housing, and the inner wall of the coupling housing is connected with a half coupling 1 and a half coupling 2 for relative rotation.

[0011] As a further solution of the utility model: the half coupling one is connected to the rotating shaft, the half coupling two is connected to the motor output shaft, and a plurality of slide grooves are provided on the opposite side of the half coupling one and the half coupling two.

[0012] As a further solution of the utility model: the inner wall of the top surface of the slide groove is an inclined surface, the inner wall of the slide groove is slidably connected with a connecting rod, and the two outer walls of the half coupling are provided with slots that cooperate with the connecting rod.

[0013] As a further solution of the utility model: a pressure cylinder is fixed to the inner wall of one side of the slide groove, the inner wall of the pressure cylinder is slidably connected to a limit rod, and the limit rod is slidably connected to the connecting rod.

[0014] As a further solution of the utility model: the top surface of the mounting block is threadedly connected with an adjusting screw, and the adjusting screw is located on both sides of the fixing rod.

[0015] Compared with the prior art, the utility model provides a transmission mechanism for a steel bar bending machine, which has the following beneficial effects:

[0016] 1. The utility model, by providing a fixed disk, a first limiting tooth, a second limiting tooth, a limiting spring and a cavity, makes the rotating shaft unable to rotate after rotating a certain number of circles, thereby realizing over-limit protection for the device.

[0017] 2. The utility model is provided with a coupling so that the motor can continue to rotate after the rotating shaft stops rotating, thereby avoiding damage to the motor due to over-limit protection of the rotating shaft.

[0018] 3. The utility model is provided with an adjusting screw to change the distance between the mounting block and the fixed plate, so that the number of turns of the rotating shaft that is stuck can be changed, thereby improving the practicality of the device.

[0019] The parts not involved in the device are the same as those in the prior art or can be implemented by using the prior art. The utility model has a simple structure and is easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the overall structure of a transmission mechanism of a steel bar bending machine proposed by the utility model;

[0021] Figure 2 It is a partial structural schematic diagram of a transmission mechanism of a steel bar bending machine proposed by the utility model;

[0022] Figure 3 A cross-sectional view of a transmission mechanism coupling of a steel bar bending machine proposed in the utility model;

[0023] Figure 4 The utility model is a partial cross-sectional view of a coupling of a transmission mechanism of a steel bar bending machine.

[0024] In the figure: 1-motor, 2-coupling housing, 3-half coupling 1, 4-half coupling 2, 5-rotating shaft, 6-driving gear, 7-driven gear, 8-fixed plate, 9-threaded rod, 10-mounting block, 11-limiting tooth 1, 12-cavity, 13-limiting tooth 2, 14-limiting spring, 15-fixing rod, 16-adjusting screw, 17-limiting plate, 18-slide groove, 19-slot, 20-connecting rod, 21-pressure cylinder, 22-limiting rod, 23-sliding cavity. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0026] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions 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 direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0027] Example 1

[0028] A steel bar bending machine transmission mechanism, such as Figures 1 to 4 As shown, it includes a motor 1, the output shaft of the motor 1 is connected to a rotating shaft 5 through a coupling, a driving gear 6 is fixed on the rotating shaft 5, a driven gear 7 is meshed with a driving gear 6 on one side, a fixed disk 8 is connected to one end of the rotating shaft 5, a limiting tooth 11 is evenly fixed on the outer wall of one side of the fixed disk 8 in an annular shape, a threaded rod 9 is fixed to the center of the outer wall of one side of the fixed disk 8, a mounting block 10 is threadedly connected to one end of the threaded rod 9, a cavity 12 is opened inside the mounting block 10 on the side opposite to the fixed disk 8, a limiting tooth 2 13 is slidably connected to the inner wall of the cavity 12, the bottom surface of the limiting tooth 2 13 is an inclined surface, the limiting tooth 2 13 is slidably matched with the limiting tooth 1 11, a limiting spring 14 is fixed to the outer wall of one end of the limiting tooth 2 13, one end of the limiting spring 14 is connected to the inner wall of the cavity 12, and the mounting block 10 is away from the fixed disk 8. A sliding cavity 23 is relatively opened at one end, and a limit plate 17 is slidably connected inside the sliding cavity 23. The outer wall of the top surface of the limit plate 17 is connected to a fixing rod 15. The coupling comprises a coupling housing 2. The inner wall of the coupling housing 2 is relatively rotatably connected with a half coupling 1 3 and a half coupling 2 4. The half coupling 1 3 is connected to the rotating shaft 5, and the half coupling 2 4 is connected to the output shaft of the motor 1. A plurality of slide grooves 18 are opened on the opposite side of the half coupling 1 3 and the half coupling 2 4. The inner wall of the top surface of the slide groove 18 is an inclined surface. A connecting rod 20 is slidably connected to the inner wall of the slide groove 18. A slot 19 cooperating with the connecting rod 20 is opened on the outer wall of the half coupling 2 4. A pressure cylinder 21 is fixed to the inner wall of one side of the slide groove 18. The inner wall of the pressure cylinder 21 is slidably connected to the limit rod 22, and the limit rod 22 is slidably connected to the connecting rod 20.

[0029] When bending the steel bar, the motor 1 is started and drives the shaft 5 to rotate through the coupling. At this time, the connecting rod 20 is inserted into the slot 19, the half coupling 1 3 is connected to the half coupling 2 4, and the shaft 5 drives the driven gear 7 to rotate through the driving gear 6 to bend the steel bar. As the shaft 5 rotates, the mounting block 10 approaches the fixed disk 8 along the threaded rod 9, and the limit plate 17 slides in the sliding cavity 23. When the limit tooth 1 11 rotates with the fixed disk 8, the limit tooth 2 13 is pushed to move along the cavity 12, and the limit spring 14 is compressed. When the limit tooth 1 11 and the limit tooth 2 13 are interlaced, the limit spring 14 pushes the limit tooth 2 13 to reset. As the mounting block 10 As the distance between the mounting block 10 and the fixed disk 8 reaches a certain level, the limit tooth 11 cannot push the limit tooth 2 13 to move, and the rotating shaft 5 cannot rotate, causing the device to stop bending. When the rotating shaft 5 stops and the motor 1 continues to rotate, the half-coupling 2 4 applies pressure to the connecting rod 20. When the pressure applied to the connecting rod 20 is greater than the air pressure inside the pressure cylinder 21, the connecting rod 20 moves along the inclined surface of the slide groove 18 and gradually shrinks into the slide groove 18, disconnecting the half-coupling 1 3 from the half-coupling 2 4, allowing the motor 1 to continue rotating, thereby preventing the rotating shaft 5 from stopping and damaging the motor 1.

[0030] By arranging the fixing plate 8, the limiting tooth 11, the limiting tooth 2 13, the limiting spring 14 and the cavity 12, the rotating shaft 5 cannot rotate after rotating a certain number of circles, thereby realizing over-limit protection for the device.

[0031] By providing the coupling, the motor 1 can continue to rotate after the rotating shaft 5 stops rotating, thereby avoiding damage to the motor 1 due to the over-limit protection of the rotating shaft 5 .

[0032] Example 2

[0033] A transmission mechanism for a steel bar bending machine. This embodiment makes the following improvements on the basis of embodiment 1: Figure 2 As shown, the top surface of the mounting block 10 is threadedly connected with an adjusting screw 16 , and the adjusting screw 16 is located on both sides of the fixing rod 15 .

[0034] By rotating the adjusting screw 16, the length of the adjusting screw 16 in the sliding cavity 23 is changed, so that the stroke of the limit plate 17 in the sliding cavity 23 is changed, the distance between the mounting block 10 and the fixed plate 8 is changed, and the number of turns of the rotating shaft 5 that is stuck is changed.

[0035] By setting the adjusting screw 16, the distance between the mounting block 10 and the fixing plate 8 is changed, so that the number of turns of the rotating shaft 5 that is stuck can be changed, thereby improving the practicability of the device.

[0036] Working principle: When bending the steel bar, the motor 1 is started and drives the rotating shaft 5 to rotate through the coupling. At this time, the connecting rod 20 is inserted into the slot 19, and the half coupling 1 3 is connected to the half coupling 2 4. The rotating shaft 5 drives the driven gear 7 to rotate through the driving gear 6 to bend the steel bar. As the rotating shaft 5 rotates, the mounting block 10 approaches the fixed disk 8 along the threaded rod 9, and the limit plate 17 slides in the sliding cavity 23. When the limit tooth 1 11 rotates with the fixed disk 8, the limit tooth 2 13 is pushed to move along the cavity 12, and the limit spring 14 is compressed. When the limit tooth 1 11 and the limit tooth 2 13 are staggered, the limit spring 14 pushes the limit tooth 2 13 to reset. As the mounting block 10 approaches the fixed disk 8, the compression amplitude of the limit spring 14 gradually increases. When the distance between the mounting block 10 and the fixed disk 8 When the distance reaches a certain level, the limit tooth 11 cannot push the limit tooth 2 13 to move, and the shaft 5 cannot rotate, causing the device to stop bending. When the shaft 5 stops and the motor 1 continues to rotate, the half-coupling 2 4 applies pressure to the connecting rod 20. When the pressure on the connecting rod 20 is greater than the air pressure inside the pressure cylinder 21, the connecting rod 20 moves along the inclined surface of the slide groove 18 and gradually shrinks toward the inside of the slide groove 18, so that the half-coupling 1 3 is disconnected from the half-coupling 2 4, allowing the motor 1 to continue to rotate, thereby preventing the shaft 5 from stopping and causing damage to the motor 1. By rotating the adjusting screw 16, the length of the adjusting screw 16 in the sliding cavity 23 is changed, the stroke of the limit plate 17 in the sliding cavity 23 is changed, and the distance between the mounting block 10 and the fixed plate 8 is changed, so that the number of turns of the shaft 5 that is stuck is changed.

[0037] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A transmission mechanism for a steel bar bending machine, comprising a motor (1), characterized in that: The output shaft of the motor (1) is connected to a rotating shaft (5) through a coupling. One end of the rotating shaft (5) is connected to a fixed disk (8). A limiting tooth (11) is evenly fixed on the outer wall of one side of the fixed disk (8) in an annular shape. A threaded rod (9) is fixed at the center of the outer wall of one side of the fixed disk (8). One end of the threaded rod (9) is threadedly connected to a mounting block (10). A cavity (12) is provided inside the mounting block (10) on the side opposite to the fixed disk (8). The inner wall of the cavity (12) is slidably connected to a limiting tooth (13). The bottom surface of the limiting tooth (13) is an inclined surface. The limiting tooth (13) is slidably matched with the limiting tooth (11). A limiting spring (14) is fixed to the outer wall of one end of the limiting tooth (13). One end of the limiting spring (14) is connected to the inner wall of the cavity (12).

2. A transmission mechanism for a steel bar bending machine according to claim 1, characterized in that: A driving gear (6) is fixed on the rotating shaft (5), and a driven gear (7) is transmission-engaged on one side of the driving gear (6).

3. A transmission mechanism for a steel bar bending machine according to claim 1, characterized in that: A sliding cavity (23) is provided at one end of the mounting block (10) away from the fixed plate (8), the interior of the sliding cavity (23) is slidably connected to a limit plate (17), and the outer wall of the top surface of the limit plate (17) is connected to a fixing rod (15).

4. A transmission mechanism for a steel bar bending machine according to claim 1, characterized in that: The coupling comprises a coupling housing (2), and the inner wall of the coupling housing (2) is connected with a half coupling (3) and a half coupling (4) for relative rotation.

5. A transmission mechanism for a steel bar bending machine according to claim 4, characterized in that: The first half coupling (3) is connected to the rotating shaft (5), the second half coupling (4) is connected to the output shaft of the motor (1), and a plurality of slide grooves (18) are provided on the opposite side of the first half coupling (3) and the second half coupling (4).

6. A transmission mechanism for a steel bar bending machine according to claim 5, characterized in that: The inner wall of the top surface of the slide groove (18) is an inclined surface, the inner wall of the slide groove (18) is slidably connected with a connecting rod (20), and the outer wall of the second half coupling (4) is provided with a slot (19) that matches the connecting rod (20).

7. A transmission mechanism for a steel bar bending machine according to claim 5, characterized in that: A pressure cylinder (21) is fixed to the inner wall of one side of the slide groove (18), and a limiting rod (22) is slidably connected to the inner wall of the pressure cylinder (21), and the limiting rod (22) is slidably connected to the connecting rod (20).

8. The transmission mechanism of a steel bar bending machine according to claim 1, characterized in that: The top surface of the mounting block (10) is threadedly connected with an adjusting screw (16), and the adjusting screw (16) is located on both sides of the fixing rod (15).

Images