An automatic start-stop device for a bottom mold trolley

Abstract

The present invention provides an automatic start-stop device for a bottom formwork trolley, which specifically includes a jacking system, a hydraulic system, and a braking system. The jacking system is used to receive the jacking force of the longitudinal movement driving device and transfer the received jacking force to the hydraulic system; the hydraulic system can, under the action of the jacking system, press hydraulic oil into or extract it from the braking system, so as to make the braking system brake or release the brake. The double-circuit hydraulic cylinder in the hydraulic system can ensure that when there is a problem with the braking system of the front wheels or rear wheels, it will not affect the other braking system; when the longitudinal movement driving device drives the bottom formwork trolley to move left or right, the automatic start-stop device of the bottom formwork trolley can automatically switch to the brake release state. When the bottom formwork trolley reaches the designated position and the longitudinal movement driving device is separated from the bottom formwork trolley, the automatic start-stop device of the bottom formwork trolley can automatically switch to the braking state, so that the bottom formwork trolley parks at the designated location, solving the problem that the bottom formwork trolley cannot park at the designated position due to the slope of the track laid in the beam yard.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge construction equipment, in particular to an automatic start-stop device for a bottom formwork trolley. Background Art

[0002] In a precast beam yard, many steps are required for a beam to be cast and formed. Among them, steam curing is a very important step. On the market, bottom formwork trolleys often use a double-pull traction of a winch and a driving motor. However, the water vapor in the steam curing chamber causes the driving motor of the bottom formwork trolley to fail, resulting in an increase in usage costs and affecting production efficiency. Therefore, various types of longitudinal movement driving devices are used to drive the bottom formwork trolley to move, which well avoids the problem of electrical components getting wet. However, the beam yard has a slope, and the longitudinal movement track of the bottom formwork trolley laid in the beam yard also has a slope. Therefore, when using a longitudinal movement driving device to drive the bottom formwork trolley, when the bottom formwork trolley reaches the designated location and the longitudinal movement driving device is separated from the bottom formwork trolley, the bottom formwork trolley will slide on the sloped longitudinal movement track under the action of gravity, resulting in serious consequences.

[0003] To solve the above problems, a device needs to be invented so that the bottom formwork trolley can maintain a parked state after reaching the designated position; when the longitudinal movement driving device drives the bottom formwork trolley to move, the braking system can maintain a released state. For this reason, technicians have carried out research on beam transport vehicles. The utility model patent "A beam transport vehicle for segmental beams" with the publication number "CN210047388U" has a principle that the beam body to be transported is placed on the vehicle frame, and the driver enters the cab. When the beam transport vehicle needs to move forward, the driver enters the forward driving cab, holds the steering wheel, steps on the clutch pedal with the left foot, and slightly steps on the accelerator pedal with the right foot to control the forward movement of the beam transport vehicle. During the driving process, the driving direction of the beam transport vehicle can be controlled by turning the steering wheel by hand; when parking is required, step on the clutch pedal with the left foot and firmly step on the brake pedal with the right foot to complete the parking process of the beam transport vehicle. When driving backward, it is necessary to enter the reverse cab, and the driving operation is the same. Although this method can run without rails, the walking and braking of this device need to be manually controlled. When the beam transport vehicle brakes, the worker needs to continuously step on the brake pedal, which has high requirements for the driver and low automation.

[0004] The utility model patent "Two-way emergency braking system for low-speed heavy-duty vehicles" with the publication number "CN211995514U" has a principle that when braking is required, the operator pulls out the safety pin, presses the cylinder push switch, the push rod is pushed out, the restraint pin drops, and the restraint of the steel wire rope is correspondingly released. The wedge block connected to the end of the steel wire rope drops accordingly and gets stuck between the two driving wheels to complete the braking. After this braking method is completed, it needs to be reset. First, the beam transport vehicle is backed up a certain distance, then the steel wire rope is recovered, and the restraint pin is inserted. The whole process is cumbersome and requires manual cooperation. Therefore, it is only applicable to emergency braking and cannot solve the problem of normal parking. Summary of the Invention

[0005] To solve the existing problems, the present invention proposes an automatic start-stop device for a bottom formwork trolley, which is used to solve the problem that the bottom formwork trolley cannot park at a designated position due to the slope of the track laid in the beam yard.

[0006] An automatic start-stop device for a bottom formwork trolley includes a jacking system, a hydraulic system, and a braking system.

[0007] The jacking system consists of a baffle plate, a top plate, a first compression spring, a first sliding rod, a swing rod, a hinge, and a connecting rod. The jacking system is installed on the frame of the bottom formwork trolley. The baffle plate is hinged to the end of the top plate. The top plate is hinged to the first sliding rod. There is a step in the top plate. The first compression spring connects the top plate and the frame. The upper end of the first sliding rod is hinged to the swing rod, and the lower end is hinged to the top plate. The upper end of the connecting rod is hinged to the swing rod, and the lower end is hinged to the second sliding rod of the hydraulic system. The swing rod is connected to the frame through a hinge. The jacking system receives the jacking force of the longitudinal movement driving device and transmits the received jacking force to the hydraulic system.

[0008] The hydraulic system includes: a second sliding rod, a double-circuit hydraulic cylinder, an oil storage tank, hydraulic oil, a first oil pipe, a second oil pipe, a third oil pipe, and a fourth oil pipe. The upper end of the second sliding rod is hinged to the connecting rod, and the lower end is connected to the first piston. The double-circuit hydraulic cylinder includes a first piston, an upper cavity compression spring, an upper cavity, a second piston, a lower cavity compression spring, and a lower cavity. The upper cavity compression spring connects the first piston and the second piston. The lower cavity compression spring connects the second piston and the bottom of the cylinder. The space between the first piston and the second piston is called the upper cavity, and the space between the second piston and the frame is called the lower cavity. When the bottom formwork trolley releases the brake and can move, the oil storage tank is connected to the upper cavity through the first oil pipe. The oil storage tank is connected to the lower cavity through the third oil pipe. The second oil pipe is connected to the braking system of the front wheels of the bottom formwork trolley, and the fourth oil pipe is connected to the braking system of the rear wheels of the bottom formwork trolley.

[0009] The braking system includes a base, brake shoes, and brake pads. The brake pads are installed on the brake shoes. The hydraulic oil is pressed into or withdrawn from the braking system through the second oil pipe and the fourth oil pipe, and the brake shoes move closer to or away from the wheel axle of the bottom formwork trolley accordingly.

[0010] For the automatic start-stop device of the bottom formwork trolley, when the longitudinal movement driving device moves from right to left, the top block pushes the baffle on the right side, and the baffle on the right side rotates clockwise around its hinge with the top plate until it is in a horizontal state. The longitudinal movement driving device continues to move leftward and contacts the baffle on the left side; the baffle on the left side is stuck by the step of the top plate. At this time, the baffle on the left side cannot rotate, and the longitudinal movement driving device cannot continue to move. At this time, the support rod of the longitudinal movement driving device rises under the drive of the jacking oil cylinder and pushes the top plate upward. The first sliding rod moves upward, and the first compression spring is compressed. The swing rod rotates counterclockwise around the hinge, and the connecting rod moves upward accordingly. The connecting rod drives the second sliding rod to move upward, and the first piston in the double-circuit hydraulic cylinder moves upward accordingly. The hydraulic oil returns to the upper cavity from the braking system through the second oil pipe under the action of negative pressure, and then flows back to the oil storage tank through the first oil pipe. At this time, in the braking system of the front wheels, the brake shoes drive the brake pads away from the wheel axle of the bottom formwork trolley, and the braking system of the front wheels is in the brake release state. The working principle of the braking system of the rear wheels is the same as that of the front wheels, that is, when the first piston moves upward, the compression spring in the upper cavity drives the second piston to move upward. The hydraulic oil flows back to the lower cavity through the fourth oil pipe and then flows back to the oil storage tank through the third oil pipe. The braking system of the rear wheels is in the brake release state. At this time, the bottom formwork trolley can move leftward along the longitudinal movement track under the drive of the longitudinal movement driving device. On the contrary, the bottom formwork trolley can move rightward along the longitudinal movement track under the drive of the longitudinal movement driving device.

[0011] After the bottom formwork trolley reaches the designated position, the jacking oil cylinder of the longitudinal movement driving device contracts, causing the support rod to move downward, the top block to separate from the top plate, the first compression spring to reset, driving the top plate and the first sliding rod to move downward. The swing rod rotates clockwise around the hinge, and the connecting rod moves downward. The connecting rod drives the second sliding rod to move downward, and the first piston in the double-circuit hydraulic cylinder moves downward accordingly. The lower end of the first piston passes over the connection hole of the first oil pipe and the double-circuit hydraulic cylinder. At this time, the upper cavity is separated from the oil storage tank. The first piston continues to move downward, and the hydraulic oil in the upper cavity is pressed into the braking system through the second oil pipe. The brake shoes drive the brake pads to approach and hold the wheel axle tightly, and the braking system of the front wheels is in the braking state. The working principle of the braking system of the rear wheels is the same as that of the front wheels, that is, the second piston moves downward under the push of the compression spring in the upper cavity. The lower end of the second piston passes over the connection hole of the third oil pipe and the double-circuit hydraulic cylinder. At this time, the lower cavity is separated from the oil storage tank. The second piston continues to move downward, and the hydraulic oil in the lower cavity is pressed into the braking system of the rear wheels. The braking system of the rear wheels is in the braking state. At this time, the bottom formwork trolley is in the parking state.

[0012] For the automatic start-stop device of the bottom formwork trolley described above, the brake pads in the braking system can be replaced.

[0013] For the automatic start-stop device of the bottom formwork trolley described above, the braking system (4) connects the front wheels and the rear wheels and can realize the simultaneous start and stop of the front wheels and the rear wheels.

[0014] Compared with the existing technology, the beneficial effects of the above automatic start-stop device of the bottom formwork trolley are as follows.

[0015] ①There is no electrical equipment and no risk of water ingress. The commonly used bottom mold trolley on the market generally installs a servo motor with a brake function on the wheels for driving and braking the bottom mold trolley. When this type of bottom mold trolley arrives at the steam curing room for steam curing, the servo motor will fail due to water ingress, resulting in poor production continuity and high equipment usage costs. The automatic start-stop device for the bottom mold trolley of the present invention uses a hydraulic system and a mechanical structure, which cooperates with the longitudinal movement driving device, does not require electrical equipment control, and has no risk of water ingress.

[0016] ②The automatic start-stop device for the bottom mold trolley uses a double-circuit hydraulic cylinder. The characteristic of this hydraulic cylinder is that it has two independent chambers, which respectively control the braking systems of the front wheels and the rear wheels. When a problem occurs in one of the braking systems of the front wheels or the rear wheels, the braking device of the other wheel can still work normally, ensuring the reliability of the equipment.

[0017] ③Assist the longitudinal movement driving device to position. When the longitudinal movement driving device drives the bottom mold trolley to move from right to left, the top block of the longitudinal movement driving device will be restricted by the baffle until the longitudinal movement driving device cannot move leftward anymore. It is easy to know that at this time, the longitudinal movement driving device reaches the specified position. At this time, the support rod of the longitudinal movement driving device can drive the top block to move upward and connect with the bottom mold trolley. Conversely, when the longitudinal movement driving device moves from left to right, the baffle can still play the same positioning role.

[0018] ④The braking system has self-adaptability. As the working time accumulates, the brake pads in the braking system will be worn and become thinner. At this time, the hydraulic oil in the oil storage tank can be replenished into the hydraulic system and the braking system, so that the brake shoes in the braking system can move a longer distance towards the wheel axle, enabling the braking system to continue to work. And in the braking system, the connection between the brake pads and the brake shoes is simple, and the replacement is convenient and fast. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the automatic start-stop device for the bottom mold trolley in the present invention.

[0020] Figure 2 It is a schematic diagram of the jacking system of the automatic start-stop device for the bottom mold trolley in the present invention in the brake state.

[0021] Figure 3 It is a schematic diagram of the hydraulic system of the automatic start-stop device for the bottom mold trolley in the present invention in the brake state.

[0022] Figure 4 It is a schematic diagram of the braking system of the automatic start-stop device for the bottom mold trolley in the present invention in the brake state.

[0023] Figure 5 It is a schematic diagram of the jacking system of the automatic start-stop device for the bottom mold trolley in the present invention in the brake release state.

[0024] Figure 6 This is a schematic diagram of the hydraulic system in the released state of the automatic start-stop device for the bottom mold trolley in the present invention.

[0025] Figure 7 This is a schematic diagram of the braking system in the released state of the automatic start-stop device for the bottom mold trolley in the present invention.

[0026] Figure 8 This is a schematic diagram of the traveling condition of the bottom mold trolley equipped with the automatic start-stop device of the present invention.

[0027] Figure 9 This is a schematic diagram of the parking condition of the bottom mold trolley equipped with the automatic start-stop device of the present invention.

[0028] Figure 10 This is a schematic diagram of the working condition of the baffle of the automatic start-stop device for the bottom mold trolley in the present invention.

[0029] The above Figures 1 to 10 The markings in the above are: 1. Lifting system, 1-1. Baffle, 1-2. Top plate, 1-2-1. Step, 1-3. First compression spring, 1-4. First sliding rod, 1-5. Swing rod, 1-6. Hinge, 1-7. Link; 2. Bottom mold trolley, 2-1. Frame, 2-2. Wheels, 2-3. Wheel axle; 3. Hydraulic system, 3-1. Second sliding rod, 3-2. Double-circuit hydraulic cylinder, 3-3. Oil storage tank, 3-4. Hydraulic oil, 3-5. First oil pipe, 3-6. Second oil pipe, 3-7. Third oil pipe, 3-8. Fourth oil pipe; 3-2-1. First piston, 3-2-2. Upper cavity compression spring, 3-2-3. Upper cavity, 3-2-4. Second piston, 3-2-5. Lower cavity compression spring, 3-2-6. Lower cavity; 4. Braking system, 4-1. Base, 4-2. Brake shoe, 4-3. Brake pad; 5. Longitudinal movement track; 6. Longitudinal movement drive device, 6-1. Support rod, 6-2. Top block, 6-3. Lifting oil cylinder. Detailed implementation manners

[0030] The technical solution of the present invention will be further described below with reference to the accompanying drawings.

[0031] An automatic start-stop device for a bottom mold trolley of the present invention is composed of a lifting system 1, a hydraulic system 3, and a braking system 4.

[0032] The described lifting system 1 is composed of a baffle 1-1, a top plate 1-2, a first compression spring 1-3, a first sliding rod 1-4, a swing rod 1-5, a hinge 1-6, and a connecting rod 1-7. The lifting system 1 is installed on the frame 2-1 of the bottom formwork trolley 2. The baffle 1-1 is hinged to the end of the top plate 1-2. The top plate 1-2 is hinged to the first sliding rod 1-4. There is a step 1-2-1 in the top plate 1-2. The first compression spring 1-3 connects the top plate 1-2 and the frame 2-1. The upper end of the first sliding rod 1-4 is hinged to the swing rod 1-5, and the lower end is hinged to the top plate 1-2. The upper end of the connecting rod 1-7 is hinged to the swing rod 1-5, and the lower end is hinged to the second sliding rod 3-1 of the hydraulic system 3. The swing rod 1-5 is connected to the frame 2-1 through the hinge 1-6. The lifting system 1 receives the lifting force of the longitudinal movement driving device 6 and transmits the received lifting force to the hydraulic system 3.

[0033] The hydraulic system 3 includes a second sliding rod 3-1, a double-circuit hydraulic cylinder 3-2, an oil storage tank 3-3, hydraulic oil 3-4, a first oil pipe 3-5, a second oil pipe 3-6, a third oil pipe 3-7, and a fourth oil pipe 3-8. The upper end of the second sliding rod 3-1 is hinged to the connecting rod 1-7, and the lower end is connected to the first piston 3-2-1. The double-circuit hydraulic cylinder 3-2 includes: a first piston 3-2-1, an upper chamber compression spring 3-2-2, an upper chamber 3-2-3, a second piston 3-2-4, a lower chamber compression spring 3-2-5, and a lower chamber 3-2-6. The upper chamber compression spring 3-2-2 connects the first piston 3-2-1 and the second piston 3-2-4. The lower chamber compression spring 3-2-5 connects the second piston 3-2-4 and the cylinder bottom. The space between the first piston 3-2-1 and the second piston 3-2-4 is called the upper chamber 3-2-3, and the space between the second piston 3-2-4 and the frame 2-1 is called the lower chamber 3-2-6. When the bottom formwork trolley 2 releases the brake and can move, the oil storage tank 3-3 is connected to the upper chamber 3-2-3 through the first oil pipe 3-5, the oil storage tank 3-3 is connected to the lower chamber 3-2-6 through the third oil pipe 3-7. The second oil pipe 3-6 is connected to the braking system 4 of the front wheels of the bottom formwork trolley 2, and the fourth oil pipe 3-8 is connected to the braking system 4 of the rear wheels of the bottom formwork trolley 2.

[0034] The braking system 4 includes a base 4-1, brake shoes 4-2, and brake pads 4-3. The brake pads 4-3 are installed on the brake shoes 4-2. The hydraulic oil 3-4 is pressed into or withdrawn from the braking system 4 through the second oil pipe 3-6 and the fourth oil pipe 3-8, and the brake shoes 4-2 approach or move away from the wheel axle 2-3 of the bottom formwork trolley 2 accordingly.

[0035] For the automatic start-stop device of the bottom die carriage, when the longitudinal movement driving device 6 moves from right to left, the top block 6-2 pushes the right baffle 1-1, and the right baffle 1-1 rotates clockwise around its hinge with the top plate 1-2 until it is in a horizontal state. The longitudinal movement driving device 6 continues to move leftward and contacts the left baffle 1-1. The left baffle 1-1 is stuck by the step 1-2-1 of the top plate 1-2. At this time, the left baffle 1-1 cannot rotate, and the longitudinal movement driving device 6 cannot continue to move. At this time, the support rod 6-1 of the longitudinal movement driving device 6 rises under the drive of the jacking oil cylinder 6-3 and jacks up the top plate 1-2. The first sliding rod 1-4 moves upward, the first compression spring 1-3 is compressed, the swing rod 1-5 rotates counterclockwise around the hinge 1-6, and the connecting rod 1-7 moves upward accordingly. The connecting rod 1-7 drives the second sliding rod 3-1 to move upward, and the first piston 3-2-1 in the double-circuit hydraulic cylinder 3-2 moves upward accordingly. The hydraulic oil 3-4 returns to the upper chamber 3-2-3 from the braking system 4 through the second oil pipe 3-6 under the action of negative pressure, and then flows back to the oil storage tank 3-3 through the first oil pipe 3-5. At this time, in the braking system 4 of the front wheels, the brake shoe 4-2 drives the brake pad 4-3 away from the wheel axle 2-3 of the bottom die carriage 2, and the braking system 4 is in a brake release state. The working principle of the braking system of the rear wheels is the same as that of the front wheels, that is, when the first piston 3-2-1 moves upward, the upper chamber compression spring 3-2-2 drives the second piston 3-2-4 to move upward, and the hydraulic oil 3-4 flows back to the lower chamber 3-2-6 through the fourth oil pipe 3-8, and then flows back to the oil storage tank 3-3 through the third oil pipe 3-7, and the braking system 4 releases the brake; at this time, the bottom die carriage 2 can move leftward along the longitudinal movement track 5 under the drive of the longitudinal movement driving device 6. Conversely, the bottom die carriage 2 can move rightward along the longitudinal movement track 5 under the drive of the longitudinal movement driving device 6.

[0036] After the bottom die carriage 2 reaches the specified position, the lifting oil cylinder 6-3 of the longitudinal movement driving device 6 contracts, causing the support rod 6-1 to move downward, separating the top block 6-2 from the top plate 1-2. The first compression spring 1-3 resets, driving the top plate 1-2 and the first slide rod 1-4 to move downward. The swing rod 1-5 rotates clockwise around the hinge 1-6, and the connecting rod 1-7 moves downward. The connecting rod 1-7 drives the second slide rod 3-1 to move downward, and the first piston 3-2-1 in the double-circuit hydraulic cylinder 3-2 moves downward accordingly. The lower end of the first piston 3-2-1 passes over the connection hole of the first oil pipe 3-5 and the double-circuit hydraulic cylinder 3-2. At this time, the upper chamber 3-2-3 is separated from the oil storage tank 3-3. The first piston 3-2-1 continues to move downward, and the hydraulic oil 3-4 in the upper chamber 3-2-3 is pressed into the braking system 4 of the front wheel through the second oil pipe 3-6. The brake shoe 4-2 drives the brake pad 4-3 to approach and hold the wheel axle 2-3 tightly. At this time, the braking system 4 is in the braking state. The working principle of the braking system of the rear wheel is the same as that of the front wheel, that is, the second piston 3-2-4 moves downward under the push of the upper chamber compression spring 3-2-2. The lower end of the second piston 3-2-4 passes over the connection hole of the third oil pipe 3-7 and the double-circuit hydraulic cylinder 3-2. At this time, the lower chamber 3-2-6 is separated from the oil storage tank 3-3. The second piston 3-2-4 continues to move downward, and the hydraulic oil 3-4 in the lower chamber 3-2-6 is pressed into the braking system 4 of the rear wheel through the fourth oil pipe 3-8. The braking system 4 of the rear wheel is in the braking state. At this time, the bottom die carriage 2 is in the parked state.

[0037] The above embodiments are only specific examples for further detailed description of the purpose, technical solutions and beneficial effects of the present invention, and the present invention is not limited thereto. Any equivalent replacement, modification, etc. made within the scope of the disclosure of the present invention are included in the protection scope of the present invention.

[0038] In addition, the terms "first", "second", "third", and "fourth" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", "third", and "fourth" may explicitly or implicitly include one or more of such features.

Claims

1. An automatic start-stop device for a bottom formwork trolley, characterized in that: the device includes a jacking system (1), a hydraulic system (3), and a braking system (4); the jacking system (1) is composed of a baffle (1-1), a top plate (1-2), a first compression spring (1-3), a first sliding rod (1-4), a swing rod (1-5), a hinge (1-6), and a connecting rod (1-7); the jacking system (1) is installed on the frame (2-1) of the bottom formwork trolley (2); the baffle (1-1) is hinged to the end of the top plate (1-2); the top plate (1-2) is hinged to the first sliding rod (1-4); there is a step (1-2-1) in the top plate (1-2); the first compression spring (1-3) connects the top plate (1-2) and the frame (2-1); the upper end of the first sliding rod (1-4) is hinged to the swing rod (1-5), and the lower end is hinged to the top plate (1-2); the upper end of the connecting rod (1-7) is hinged to the swing rod (1-5), and the lower end is hinged to the second sliding rod (3-1) of the hydraulic system (3); the swing rod (1-5) is connected to the frame (2-1) through the hinge (1-6); the jacking system (1) receives the jacking force of the longitudinal movement driving device (6) and transmits the received jacking force to the hydraulic system (3); the hydraulic system (3) includes: a second sliding rod (3-1), a double-circuit hydraulic cylinder (3-2), an oil storage tank (3-3), hydraulic oil (3-4), a first oil pipe (3-5), a second oil pipe (3-6), a third oil pipe (3-7), and a fourth oil pipe (3-8); the upper end of the second sliding rod (3-1) is hinged to the connecting rod (1-7), and the lower end is connected to the first piston (3-2-1) of the double-circuit hydraulic cylinder (3-2); the double-circuit hydraulic cylinder (3-2) includes: a first piston (3-2-1), an upper cavity compression spring (3-2-2), an upper cavity (3-2-3), a second piston (3-2-4), a lower cavity compression spring (3-2-5), and a lower cavity (3-2-6); the upper cavity compression spring (3-2-2) connects the first piston (3-2-1) and the second piston (3-2-4); the lower cavity compression spring (3-2-5) connects the second piston (3-2-4) to the cylinder bottom; between the first piston (3-2-1) and the second piston (3-2-4) is the upper cavity (3-2-3), and between the second piston (3-2-4) and the frame (2-1) is the lower cavity (3-2-6); when the bottom formwork trolley (2) releases the brake and can move, the oil storage tank (3-3) is connected to the upper cavity (3-2-3) through the first oil pipe (3-5), the oil storage tank (3-3) is connected to the lower cavity (3-2-6) through the third oil pipe (3-7), the second oil pipe (3-6) is connected to the braking system (4) of the front wheels of the bottom formwork trolley (2), and the fourth oil pipe (3-8) is connected to the braking system (4) of the rear wheels of the bottom formwork trolley (2); The braking system (4) includes: a base (4-1), a brake shoe (4-2), and a brake pad (4-3); the brake pad (4-3) is mounted on the brake shoe (4-2); the hydraulic oil (3-4) can be pressed into or withdrawn from the braking system (4) through the second oil pipe (3-6) and the fourth oil pipe (3-8), and the brake shoe (4-2) moves closer to or away from the wheel axle (2-3) of the bottom mold carriage (2), so as to realize braking or releasing the brake of the bottom mold carriage (2). The automatic start-stop device of the bottom mold carriage: when the longitudinal movement driving device (6) moves from right to left, the top block (6-2) pushes the right baffle (1-1), and the right baffle (1-1) rotates clockwise around its hinge with the top plate (1-2) until it is in a horizontal state; the longitudinal movement driving device (6) continues to move leftward and contacts the left baffle (1-1); the left baffle (1-1) is stuck by the step (1-2-1) of the top plate (1-2), and at this time, the left baffle (1-1) cannot rotate, and the longitudinal movement driving device (6) cannot continue to move; at this time, the support rod (6-1) of the longitudinal movement driving device (6) rises under the drive of the lifting oil cylinder (6-3) and pushes the top plate (1-2) upward, the first slide rod (1-4) moves upward, the first compression spring (1-3) is compressed, the swing rod (1-5) rotates counterclockwise around the hinge (1-6), and the connecting rod (1-7) moves upward accordingly; the connecting rod (1-7) drives the second slide rod (3-1) to move upward, and the first piston (3-2-1) in the double-circuit hydraulic cylinder (3-2) moves upward accordingly, and the hydraulic oil (3-4) is withdrawn from the braking system (4) through the second oil pipe (3-6) into the upper cavity (3-2-3) under the action of negative pressure, and then flows back into the storage oil tank (3-3) through the first oil pipe (3-5). At this time, in the braking system (4) of the front wheels, the brake shoe (4-2) drives the brake pad (4-3) to move away from the wheel axle (2-3) of the bottom mold carriage (2), and the braking system (4) is in a brake release state; the working principle of the braking system of the rear wheels is the same as that of the front wheels, that is, when the first piston (3-2-1) moves upward, the upper cavity compression spring (3-2-2) drives the second piston (3-2-4) to move upward, the hydraulic oil (3-4) flows back into the lower cavity (3-2-6) through the fourth oil pipe (3-8), and then flows back into the storage oil tank (3-3) through the third oil pipe (3-7), and the braking system (4) releases the brake; at this time, the bottom mold carriage (2) can move leftward along the longitudinal movement track (5) under the drive of the longitudinal movement driving device (6); conversely, the bottom mold carriage (2) can move rightward along the longitudinal movement track (5) under the drive of the longitudinal movement driving device (6). After the bottom formwork trolley (2) reaches the specified position, the lifting oil cylinder (6-3) of the longitudinal movement drive device (6) contracts, causing the support rod (6-1) to move downward, separating the top block (6-2) from the top plate (1-2). The first compression spring (1-3) resets, driving the top plate (1-2) and the first sliding rod (1-4) downward. The swing rod (1-5) rotates clockwise around the hinge (1-6), and the connecting rod (1-7) moves downward. The connecting rod (1-7) drives the second sliding rod (3-1) downward, and the first piston (3-2-1) in the double-circuit hydraulic cylinder (3-2) moves downward accordingly. The lower end of the first piston (3-2-1) passes over the connection hole of the first oil pipe (3-5) and the double-circuit hydraulic cylinder (3-2). At this time, the upper chamber (3-2-3) is separated from the oil storage tank (3-3). The first piston (3-2-1) continues to move downward, and the hydraulic oil (3-4) in the upper chamber (3-2-3) is pressed into the braking system (4) of the front wheels through the second oil pipe (3-6). The brake shoe (4-2) drives the brake pad (4-3) to approach and clamp the wheel axle (2-3). At this time, the braking system (4) is in the braking state. The working principle of the braking system of the rear wheels is the same as that of the front wheels, that is, the second piston (3-2-4) moves downward under the push of the upper chamber compression spring (3-2-2). The lower end of the second piston (3-2-4) passes over the connection hole of the third oil pipe (3-7) and the double-circuit hydraulic cylinder (3-2). At this time, the lower chamber (3-2-6) is separated from the oil storage tank (3-3). The second piston (3-2-4) continues to move downward, and the hydraulic oil (3-4) in the lower chamber (3-2-6) is pressed into the braking system (4) of the rear wheels through the fourth oil pipe (3-8). The braking system (4) of the rear wheels is in the braking state. At this time, the bottom formwork trolley (2) is in the parking state.

2. The automatic start-stop device for the bottom formwork trolley according to claim 1, characterized in that: The brake pad (4-3) in the braking system (4) can be replaced.

3. The automatic start-stop device for the bottom formwork trolley according to claim 1, characterized in that: The braking system (4) connects the front wheels and the rear wheels and can realize the simultaneous start and stop of the front wheels and the rear wheels.

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