CN211809805U

CN211809805U - Transport cart

Info

Publication number: CN211809805U
Application number: CN202020325792.0U
Authority: CN
Inventors: 孔芹; 周钰爽; 陈冬雪; 庞阳; 张欣怡
Original assignee: Zhengzhou Railway Vocational and Technical College
Current assignee: Zhengzhou Railway Vocational and Technical College
Priority date: 2020-03-16
Filing date: 2020-03-16
Publication date: 2020-10-30
Anticipated expiration: 2030-03-16

Abstract

The utility model relates to the field of transportation equipment, in particular to a freight car, which comprises a frame and a turnover goods shelf, wherein the turnover goods shelf is connected on the frame, the freight car also comprises a power mechanism, a steering mechanism brake mechanism and a power supply, the frame comprises a support plate, a side plate, a pedal plate, a fixed pipe, a fixed pin I, a fixed pin II, a fixed plate, a fixed pin III and a fixed shaft, the power mechanism comprises a walking wheel, a transmission shaft, a transmission belt wheel, a motor belt wheel and a motor, the steering mechanism comprises a steering wheel, a steering wheel frame, a handrail bracket and a control switch, the turnover goods shelf comprises a goods shelf, a turnover handrail, a pin shaft, a locking plate, a tension spring I, a limiting plate and a rotating pipe, the brake mechanism comprises a brake block, a sliding rack, a gear, a tension spring II, a control support arm, a, the utility model discloses have power device, reduce user's intensity of labour, it is more convenient to use.

Description

Transport cart

Technical Field

The utility model relates to a transportation equipment field especially relates to a freight train.

Background

At present, when goods are distributed in a logistics center and parts produced in a factory are transported in a short distance, a trolley pushed by hand is often used as a transport tool. The trolley is used by a single person, has simple shape, small and exquisite shape, flexible pushing and convenient use. However, once the machine is used for pushing and transporting heavy materials or machine parts, the labor intensity of workers is high, and particularly when the workers touch an ascending slope, the workers cannot push the materials or the machine parts by one person.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a freight train has power device, reduces user's intensity of labour, convenient to use.

The purpose of the utility model is realized through the following technical scheme:

a transport cart comprises a frame and an overturning goods shelf, wherein the overturning goods shelf is connected to the frame, the transport cart further comprises a power mechanism, a steering mechanism brake mechanism and a power supply, the power mechanism is connected to the lower end of the frame, the steering mechanism is rotatably connected to the rear end of the frame, the brake mechanism is connected to the frame, and the power supply is fixedly connected to the frame and is communicated with the power mechanism through a wire;

the bicycle frame comprises a supporting plate, side plates, pedals, fixing pipes, a fixing pin I, a fixing pin II, two fixing plates, a fixing pin III and a fixing shaft, wherein the side plates are fixedly connected to two sides of the supporting plate;

the power mechanism comprises walking wheels, a transmission shaft, a transmission belt wheel, a motor belt wheel and a motor, wherein the walking wheels are fixedly connected to two ends of the transmission shaft, the transmission belt wheel is fixedly connected to the transmission shaft, the motor belt wheel is fixedly connected to an output shaft of the motor, the motor is fixedly connected to the front end of the pedal plate, the transmission belt wheel is in belt transmission connection with the motor belt wheel, the transmission shaft is rotatably connected to the lower parts of the front ends of the two side plates, and the motor is connected with a power supply through a wire;

the steering mechanism comprises a steering wheel, a steering wheel frame, a handrail support and a control switch, the steering wheel is rotationally connected in the steering wheel frame, the steering wheel frame is fixedly connected at the lower end of the handrail support, the control switch is fixedly connected at the upper end of the handrail support, the handrail support is rotationally connected in a fixed pipe, and the control switch is connected with a motor and a power supply through leads;

the turnover goods shelf comprises a goods shelf, turnover handrails, a pin shaft, a locking plate, a tension spring I, a limiting plate and a rotating pipe, wherein the rear end of the goods shelf is fixedly connected with the two turnover handrails;

brake mechanism include the brake block, the slip rack, the gear, extension spring II, the control support arm, the brake locking pole, control lever and locking pole slide, brake block fixed connection is at the front end of slip rack, slip rack sliding connection is on the fixed plate, gear revolve connects on fixed pin II, gear and slip rack toothing transmission, the lower extreme and the gear fixed connection of extension spring II, the upper end and the III fixed connection of fixed pin of extension spring II, control support arm fixed connection is on the gear, locking pole slide fixed connection is on the curb plate that is located the left end, brake locking pole sliding connection is at the locking pole slide, the upper end fixedly connected with control lever of brake locking pole, be equipped with the locking groove on the locking pole slide, locking groove sliding connection on control lever and the locking pole slide.

The utility model has the advantages that: the utility model provides a freight car provides power for the dolly through power unit and power, reduces user's intensity of labour, and it is more convenient to use, and upset goods shelves have the upset function moreover, make the dolly more convenient when unloading.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention;

fig. 2 is a schematic view of the overall structure of the present invention;

fig. 3 is a schematic diagram of the overall structure of the present invention;

FIG. 4 is a schematic view of the frame structure of the present invention;

fig. 5 is a schematic structural view of the power mechanism of the present invention;

fig. 6 is a schematic structural view of the steering mechanism of the present invention;

fig. 7 is a schematic view of the structure of the turnover shelf of the present invention;

FIG. 8 is a schematic view of a partially enlarged structure of the turnover shelf of the present invention;

fig. 9 is a schematic structural view of the brake mechanism of the present invention.

In the figure: a frame 1; a support plate 1-1; side plates 1-2; 1-3 of a pedal; 1-4 of a fixed pipe; fixing pins I1-5; fixing pins II 1-6; fixing plates 1-7; fixing pins III 1-8; 1-9 parts of a fixed shaft; a power mechanism 2; 2-1 of a traveling wheel; a transmission shaft 2-2; 2-3 of a transmission belt wheel; 2-4 of motor belt wheel; 2-5 of a motor; a steering mechanism 3; a steering wheel 3-1; 3-2 of a steering wheel frame; 3-3 of a handrail support; 3-4 of a control switch; turning over the goods shelf 4; 4-1 of a shelf; turning the handrail 4-2; 4-3 of a pin shaft; 4-4 of a locking plate; 4-5 of a tension spring I; 4-6 parts of a limiting plate; 4-7 of a rotating pipe; a brake mechanism 5; 5-1 of a brake block; a sliding rack 5-2; 5-3 parts of gear; 5-4 of a tension spring; controlling the support arm 5-5; 5-6 parts of a brake locking rod; 5-7 of a control rod; locking bar slide 5-8; a power supply 6.

Detailed Description

The present invention will be described in further detail with reference to the accompanying fig. 1-9.

The first embodiment is as follows:

as shown in fig. 1-9, a delivery truck comprises a frame 1 and a turnover shelf 4, wherein the turnover shelf 4 is connected to the frame 1, the delivery truck further comprises a power mechanism 2, a steering mechanism 3, a brake mechanism 5 and a power supply 6, the power mechanism 2 is connected to the lower end of the frame 1, the steering mechanism 3 is rotatably connected to the rear end of the frame 1, the brake mechanism 5 is connected to the frame 1, and the power supply 6 is fixedly connected to the frame 1 and is communicated with the power mechanism 2 through a wire.

When the goods turning device is used, goods are placed on the turning goods shelf 4, a user stands on the vehicle frame 1, the power mechanism 2 is started through the control switch 3-4 on the steering mechanism 3, the power mechanism 2 drives the device to move, when the turning mechanism 3 needs to turn, the steering mechanism 3 can turn, when the turning mechanism needs to stop, the control switch 3-4 is closed, the device stops through the brake mechanism 5, the brake mechanism 5 is locked in a brake state, the device can be stopped, when the goods are unloaded, the locking plate 4-4 on the goods shelf 4-1 is separated from the fixing pin I1-5, the goods shelf 4-1 can be turned, and therefore the goods are turned and unloaded.

The second embodiment is as follows:

as shown in the figures 1-9, the vehicle frame 1 comprises a support plate 1-1, side plates 1-2, pedals 1-3, fixing pipes 1-4, fixing pins I1-5, fixing pins II 1-6, fixing plates 1-7, fixing pins III 1-8 and fixing shafts 1-9, wherein the side plates 1-2 are fixedly connected to both sides of the support plate 1-1, the pedals 1-3 are fixedly connected to the rear ends of the two side plates 1-2, the fixing pipes 1-4 are fixedly connected to the pedals 1-3, two fixing plates 1-7 are arranged, the two fixing plates 1-7 are fixedly connected to the pedals 1-3, the fixing pins I1-5, the fixing pins II 1-6, the fixing plates 1-7 and the fixing pins III 1-8 are fixedly connected to the side plate 1-2 on the left side, the fixed shaft 1-9 is fixedly connected with the front ends of the two side plates 1-2, and the power supply 6 is fixedly connected with the pedal plate 1-3;

the support plate 1-1 is used for supporting the turnover goods shelf 4, the side plate 1-2 is used for installing the power mechanism 2, the pedal plate 1-3 is used for a user to stand, the fixing pipe 1-4 is used for installing the steering mechanism 3, and the fixing shaft 1-9 is used for overturning the turnover goods shelf 4 to unload goods.

The third concrete implementation mode:

as shown in fig. 1-9, the power mechanism 2 includes a traveling wheel 2-1, a transmission shaft 2-2, a transmission belt wheel 2-3, a motor belt wheel 2-4 and a motor 2-5, both ends of the transmission shaft 2-2 are fixedly connected with the traveling wheel 2-1, the transmission belt wheel 2-3 is fixedly connected to the transmission shaft 2-2, the motor belt wheel 2-4 is fixedly connected to an output shaft of the motor 2-5, the motor 2-5 is fixedly connected to the front end of the pedal 1-3, the transmission belt wheel 2-3 is connected to the motor belt wheel 2-4 through belt transmission, the transmission shaft 2-2 is rotatably connected to the lower part of the front ends of the two side plates 1-2, and the motor 2-5 is connected to the power supply 6;

when the device needs to move, the control switch 3-4 is turned on to enable the motor 2-5 to be communicated with the power supply 6, the motor 2-5 is started, the motor 2-5 drives the transmission belt wheel 2-3 through the motor belt wheel 2-4, and the transmission belt wheel 2-3 drives the traveling wheel 2-1 to rotate through the transmission shaft 2-2, so that the device moves forward.

The fourth concrete implementation mode:

as shown in fig. 1-9, the steering mechanism 3 includes a steering wheel 3-1, a steering wheel frame 3-2, a handrail support 3-3 and a control switch 3-4, the steering wheel 3-1 is rotatably connected in the steering wheel frame 3-2, the steering wheel frame 3-2 is fixedly connected at the lower end of the handrail support 3-3, the control switch 3-4 is fixedly connected at the upper end of the handrail support 3-3, the handrail support 3-3 is rotatably connected in a fixed tube 1-4, and the control switch 3-4 is connected with a motor 2-5 and a power supply 6 through a wire;

when the steering mechanism 3 is used, the handrail support 3-3 is directly rotated, and the handrail support 3-3 drives the steering wheel 3-1 to steer through the steering wheel frame 3-2, so that the device steers.

The fifth concrete implementation mode:

as shown in the figures 1-9, the turnover shelf 4 comprises a shelf 4-1, turnover armrests 4-2, a pin shaft 4-3, a lock plate 4-4, a tension spring I4-5, a limit plate 4-6 and a rotating pipe 4-7, wherein the rear end of the shelf 4-1 is fixedly connected with the two turnover armrests 4-2, the pin shaft 4-3 and the limit plate 4-6 are both fixedly connected with the left end of the shelf 4-1, the upper end of the lock plate 4-4 is rotatably connected with the pin shaft 4-3, one end of the tension spring I4-5 is fixedly connected with the limit plate 4-6, the other end of the tension spring I4-5 is fixedly connected with the lock plate 4-4, the lock plate 4-4 is tightly connected with the limit plate 4-6, the rotating pipe 4-7 is fixedly connected with the front end of the shelf 4-, the rotating pipe 4-7 is rotatably connected to the fixed shaft 1-9, the lower end of the locking plate 4-4 is provided with a locking groove, and the fixing pin III 1-8 is slidably connected into the locking groove at the lower end of the locking plate 4-4;

the goods shelf 4-1 is used for loading goods, the locking groove at the lower end of the locking plate 4-4 is matched with the fixing pin III 1-8, the goods shelf 4-1 is prevented from automatically overturning, meanwhile, the locking plate 4-4 is pulled through the pulling force of the tension spring I4-5, the locking groove at the lower end of the locking plate 4-4 is prevented from being separated from the fixing pin III 1-8, when unloading is carried out, the locking plate 4-4 is pulled backwards to enable the locking groove at the lower end of the locking plate 4-4 to be separated from the fixing pin III 1-8, then the goods shelf 4-1 is overturned by using the fixing shaft 1-9 as a shaft through the overturning handrail 4-2 to unload the goods, the limiting plate 4-6 is used for limiting the locking plate 4-4, after the goods are unloaded, the goods shelf 4-1 is rotated back through the overturning handrail 4-2, and the, the shelf 4-1 is fixed.

The sixth specific implementation mode:

as shown in the figures 1-9, the brake mechanism 5 comprises a brake block 5-1, a sliding rack 5-2, a gear 5-3, a tension spring II 5-4, a control support arm 5-5, a brake locking rod 5-6, a control rod 5-7 and a locking rod sliding seat 5-8, the brake block 5-1 is fixedly connected with the front end of the sliding rack 5-2, the sliding rack 5-2 is slidably connected with a fixing plate 1-7, the gear 5-3 is rotatably connected with a fixing pin II 1-6, the gear 5-3 is in meshing transmission with the sliding rack 5-2, the lower end of the tension spring II 5-4 is fixedly connected with the gear 5-3, the upper end of the tension spring II 5-4 is fixedly connected with a fixing pin III 1-8, the control support arm 5-5 is fixedly connected with the gear 5-3, the locking rod sliding seat 5-8 is fixedly connected to the side plate 1-2 at the left end, the brake locking rod 5-6 is connected to the locking rod sliding seat 5-8 in a sliding mode, the upper end of the brake locking rod 5-6 is fixedly connected with the control rod 5-7, a locking groove is formed in the locking rod sliding seat 5-8, and the control rod 5-7 is connected with the locking groove in the locking rod sliding seat 5-8 in a sliding mode.

When the device needs to be braked, the control support arm 5-5 is stepped downwards to drive the gear 5-3 to overcome the tension of the tension spring II 5-4 to rotate, the sliding rack 5-2 is meshed with the gear 5-3 to enable the sliding rack 5-2 to slide forwards, so that the brake block 5-1 is pushed forwards and is contacted with the road wheel 2-1, the device is decelerated and stopped to achieve the purpose of braking through the friction force between the brake block 5-1 and the road wheel 2-1, the control support arm 5-5 is released, the gear 5-3 is rotated by the tension of the tension spring II 5-4, so that the brake block 5-1 is separated from the road wheel 2-1, the brake is released, and when the device needs to be kept in a stopped state, the brake locking rod 5-6 slides downwards to the lowest end in the locking rod sliding seat 5-8 through the control rod 5-7, and the control rod 5-7 is rotated to slide into the locking groove at the lower end of the locking rod sliding seat 5-8, so that the brake locking rod 5-6 stays at the lower end of the locking rod sliding seat 5-8, meanwhile, the control support arm 5-5 is tightly pressed, so that the brake block 5-1 is contacted with the road wheel 2-1 to keep a brake state, when the brake is not needed, the control rod 5-7 is rotated to slide out of the locking groove at the lower end of the locking rod sliding seat 5-8, the control rod 5-7 is pulled upwards, the control rod 5-7 drives the brake locking rod 5-6 to move upwards, when the brake locking rod 5-6 is slid to the uppermost end in the locking rod slide seat 5-8, the rotary control rod 5-7 is slid into the locking groove at the upper end of the locking rod slide seat 5-8, so that the brake locking rod 5-6 stays at the upper end of the locking rod slide seat 5-8 and is separated from the control support arm 5-5.

The utility model relates to a freight train, its theory of use does: when the goods turning device is used, goods are placed on the turning goods shelf 4, a user stands on the vehicle frame 1, the power mechanism 2 is started through the control switch 3-4 on the steering mechanism 3, the power mechanism 2 drives the device to move, when the turning mechanism 3 needs to turn, the steering mechanism 3 can turn, when the turning mechanism needs to stop, the control switch 3-4 is closed, the device stops through the brake mechanism 5, the brake mechanism 5 is locked in a brake state, the device can be stopped, when the goods are unloaded, the locking plate 4-4 on the goods shelf 4-1 is separated from the fixing pin I1-5, the goods shelf 4-1 can be turned, and therefore the goods are turned and unloaded. The support plate 1-1 is used for supporting the turnover goods shelf 4, the side plate 1-2 is used for installing the power mechanism 2, the pedal plate 1-3 is used for a user to stand, the fixing pipe 1-4 is used for installing the steering mechanism 3, and the fixing shaft 1-9 is used for overturning the turnover goods shelf 4 to unload goods. When the device needs to move, the control switch 3-4 is turned on to enable the motor 2-5 to be communicated with the power supply 6, the motor 2-5 is started, the motor 2-5 drives the transmission belt wheel 2-3 through the motor belt wheel 2-4, and the transmission belt wheel 2-3 drives the traveling wheel 2-1 to rotate through the transmission shaft 2-2, so that the device moves forward. When the steering mechanism 3 is used, the handrail support 3-3 is directly rotated, and the handrail support 3-3 drives the steering wheel 3-1 to steer through the steering wheel frame 3-2, so that the device steers. The goods shelf 4-1 is used for loading goods, the locking groove at the lower end of the locking plate 4-4 is matched with the fixing pin III 1-8, the goods shelf 4-1 is prevented from automatically overturning, meanwhile, the locking plate 4-4 is pulled through the pulling force of the tension spring I4-5, the locking groove at the lower end of the locking plate 4-4 is prevented from being separated from the fixing pin III 1-8, when unloading is carried out, the locking plate 4-4 is pulled backwards to enable the locking groove at the lower end of the locking plate 4-4 to be separated from the fixing pin III 1-8, then the goods shelf 4-1 is overturned by using the fixing shaft 1-9 as a shaft through the overturning handrail 4-2 to unload the goods, the limiting plate 4-6 is used for limiting the locking plate 4-4, after the goods are unloaded, the goods shelf 4-1 is rotated back through the overturning handrail 4-2, and the, the shelf 4-1 is fixed. When the device needs to be braked, the control support arm 5-5 is stepped downwards to drive the gear 5-3 to overcome the tension of the tension spring II 5-4 to rotate, the sliding rack 5-2 is meshed with the gear 5-3 to enable the sliding rack 5-2 to slide forwards, so that the brake block 5-1 is pushed forwards and is contacted with the road wheel 2-1, the device is decelerated and stopped to achieve the purpose of braking through the friction force between the brake block 5-1 and the road wheel 2-1, the control support arm 5-5 is released, the gear 5-3 is rotated by the tension of the tension spring II 5-4, so that the brake block 5-1 is separated from the road wheel 2-1, the brake is released, and when the device needs to be kept in a stopped state, the brake locking rod 5-6 slides downwards to the lowest end in the locking rod sliding seat 5-8 through the control rod 5-7, and the control rod 5-7 is rotated to slide into the locking groove at the lower end of the locking rod sliding seat 5-8, so that the brake locking rod 5-6 stays at the lower end of the locking rod sliding seat 5-8, meanwhile, the control support arm 5-5 is tightly pressed, so that the brake block 5-1 is contacted with the road wheel 2-1 to keep a brake state, when the brake is not needed, the control rod 5-7 is rotated to slide out of the locking groove at the lower end of the locking rod sliding seat 5-8, the control rod 5-7 is pulled upwards, the control rod 5-7 drives the brake locking rod 5-6 to move upwards, when the brake locking rod 5-6 is slid to the uppermost end in the locking rod slide seat 5-8, the rotary control rod 5-7 is slid into the locking groove at the upper end of the locking rod slide seat 5-8, so that the brake locking rod 5-6 stays at the upper end of the locking rod slide seat 5-8 and is separated from the control support arm 5-5.

Of course, the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art can make variations within the scope of the present invention; modifying; addition or replacement also belong to the protection scope of the utility model.

Claims

1. The utility model provides a freight train, includes frame (1) and upset goods shelves (4), upset goods shelves (4) connect on frame (1), its characterized in that: this freight train still includes power unit (2), steering mechanism (3) brake mechanism (5) and power (6), power unit (2) connect the lower extreme in frame (1), steering mechanism (3) rotate and connect the rear end in frame (1), brake mechanism (5) connect on frame (1), power (6) fixed connection just passes through the wire intercommunication with power unit (2) on frame (1).

2. A cart according to claim 1, wherein: the bicycle frame (1) comprises a supporting plate (1-1), side plates (1-2), foot pedals (1-3), fixing pipes (1-4), fixing pins I (1-5), fixing pins II (1-6), fixing plates (1-7), fixing pins III (1-8) and fixing shafts (1-9), wherein the side plates (1-2) are fixedly connected to two sides of the supporting plate (1-1), the foot pedals (1-3) are fixedly connected to the rear ends of the two side plates (1-2), the fixing pipes (1-4) are fixedly connected to the foot pedals (1-3), the number of the fixing plates (1-7) is two, the two fixing plates (1-7) are fixedly connected to the foot pedals (1-3), the fixing pins I (1-5), the fixing pins II (1-6), The fixing plates (1-7) and the fixing pins III (1-8) are fixedly connected to the side plates (1-2) on the left side, the fixing shafts (1-9) are fixedly connected to the front ends of the two side plates (1-2), and the power supply (6) is fixedly connected to the pedals (1-3).

3. A cart according to claim 2, wherein: the power mechanism (2) comprises a traveling wheel (2-1) and a transmission shaft (2-2), the walking wheel type pedal bicycle comprises a transmission belt wheel (2-3), a motor belt wheel (2-4) and a motor (2-5), wherein walking wheels (2-1) are fixedly connected to two ends of the transmission shaft (2-2), the transmission belt wheel (2-3) is fixedly connected to the transmission shaft (2-2), the motor belt wheel (2-4) is fixedly connected to an output shaft of the motor (2-5), the motor (2-5) is fixedly connected to the front end of a pedal (1-3), the transmission belt wheel (2-3) is connected with the motor belt wheel (2-4) through belt transmission, the transmission shaft (2-2) is rotatably connected to the lower portion of the front ends of the two side plates (1-2), and the motor (2-5) is connected with a power supply (6) through a wire.

4. A cart according to claim 3, wherein: the steering mechanism (3) comprises a steering wheel (3-1), a steering wheel frame (3-2), an armrest support (3-3) and a control switch (3-4), the steering wheel (3-1) is rotatably connected in the steering wheel frame (3-2), the steering wheel frame (3-2) is fixedly connected at the lower end of the armrest support (3-3), the control switch (3-4) is fixedly connected at the upper end of the armrest support (3-3), the armrest support (3-3) is rotatably connected in a fixed pipe (1-4), and the control switch (3-4) is connected with a motor (2-5) and a power supply (6) through a lead.

5. A cart according to claim 4, wherein: the turnover shelf (4) comprises a shelf (4-1), turnover handrails (4-2), a pin shaft (4-3), a lock plate (4-4), a tension spring I (4-5), limit plates (4-6) and a rotating pipe (4-7), wherein the rear end of the shelf (4-1) is fixedly connected with the two turnover handrails (4-2), the pin shaft (4-3) and the limit plates (4-6) are fixedly connected with the left end of the shelf (4-1), the upper end of the lock plate (4-4) is rotatably connected on the pin shaft (4-3), one end of the tension spring I (4-5) is fixedly connected with the limit plates (4-6), the other end of the tension spring I (4-5) is fixedly connected with the lock plate (4-4), and the lock plate (4-4) is tightly connected with the limit plates (4-6), the rotating pipe (4-7) is fixedly connected to the front end of the goods shelf (4-1), the rotating pipe (4-7) is rotatably connected to the fixed shaft (1-9), the lower end of the locking plate (4-4) is provided with a locking groove, and the fixing pin III (1-8) is slidably connected into the locking groove at the lower end of the locking plate (4-4).

6. A cart according to claim 5, wherein: the brake mechanism (5) comprises a brake block (5-1), a sliding rack (5-2), a gear (5-3), a tension spring II (5-4), a control support arm (5-5), a brake locking rod (5-6), a control rod (5-7) and a locking rod sliding seat (5-8), wherein the brake block (5-1) is fixedly connected to the front end of the sliding rack (5-2), the sliding rack (5-2) is slidably connected to a fixing plate (1-7), the gear (5-3) is rotatably connected to the fixing pin II (1-6), the gear (5-3) is in meshing transmission with the sliding rack (5-2), the lower end of the tension spring II (5-4) is fixedly connected with the gear (5-3), the upper end of the tension spring II (5-4) is fixedly connected with the fixing pin III (1-8), the control support arm (5-5) is fixedly connected to the gear (5-3), the locking rod sliding seat (5-8) is fixedly connected to the side plate (1-2) located at the left end, the brake locking rod (5-6) is connected to the locking rod sliding seat (5-8) in a sliding mode, the upper end of the brake locking rod (5-6) is fixedly connected with the control rod (5-7), a locking groove is formed in the locking rod sliding seat (5-8), and the control rod (5-7) is connected with the locking groove in the locking rod sliding seat (5-8) in a sliding mode.