Ratchet wheel braking device on pull arm mechanism

Abstract

The utility model discloses a ratchet wheel braking device on a pull arm mechanism, which belongs to the technical field of braking equipment, aims to solve the problems that a brake of the pull arm mechanism is out of order and a suspension arm moves downwards to impact on a building to cause major safety accidents, and comprises a braking ratchet wheel, a braking pawl and a hydraulic push rod, the brake ratchet wheel is provided with a winding drum side plate through a high-strength bolt and an elastic cylindrical pin, the brake pawl is assembled with a brake support through a first pin shaft, a second pin shaft is assembled in a middle hole of the brake support, the upper portion of a spring is hung on a circular ring of the brake pawl, and the lower portion of the spring is hung on the second pin shaft.

Description

TECHNICAL FIELD

[0001] The utility model relates to brake equipment technical field, concretely relates to a ratchet brake device on pull arm mechanism. BACKGROUND

[0002] For the hoisting of high-rise building, tower crane is used in large quantities, and the pull arm mechanism is a key component on the luffing tower crane, which is used to wind or unwind the steel wire rope through the rotation of the pull arm mechanism drum, to pull the jib to realize the amplitude variation of the tower crane.

[0003] Because the pull arm mechanism bears the gravity of the jib and the hoisted object, the safety performance of the brake of the pull arm mechanism is very important.

[0004] The brake should meet the following requirements:

[0005] 1. A support brake should be provided;

[0006] 2. A safety brake, which is controlled by the operator or the overspeed protection switch and directly acts on the end of the transmission chain (the steel wire rope drum), should be provided to prevent the failure of the support brake and reduce the damage of the transmission chain to cause accidents, and to provide braking when the motor, the transmission device and the support brake are replaced or repaired;

[0007] However, in the actual use of the tower crane, due to the problems such as wear of the brake friction plate, large brake gap, deformation of the brake disc and untimely maintenance, the braking torque is insufficient, and the brake of the pull arm mechanism fails repeatedly, the jib moves downward and collides with the building, causing major safety accidents and huge economic losses. CONTENT OF THE UTILITY MODEL

[0008] In view of the deficiencies of the prior art, the utility model provides a ratchet brake device on a pull arm mechanism, which comprises a brake ratchet, a brake pawl and a hydraulic push rod, the brake ratchet is provided with a drum side plate through high-strength bolts and elastic cylindrical pins, the brake pawl is assembled with a brake support through a first pin shaft, a second pin shaft is assembled in the middle hole of the brake support, the upper part of the brake pawl is hung with the upper part of a spring, and the lower part of the spring is hung on the second pin shaft.

[0009] As a further improvement of the utility model, the brake support is welded together with the pull arm mechanism chassis.

[0010] As a further improvement of the utility model, the first pin shaft is fixed through a first split pin.

[0011] As a further improvement of the utility model, the brake support has three groups of middle holes, so that the second pin shaft can be assembled at different positions of the three groups of holes.

[0012] As a further improvement of the utility model, the upper part of the hydraulic push rod is a telescopic push rod head hole, the push rod head hole is assembled in the brake pawl rear connecting hole through a third pin shaft.

[0013] As a further improvement of the utility model, the third pin shaft is fixed by a second split pin.

[0014] As a further improvement of the utility model, the connecting hole of the lower push rod body of the hydraulic push rod is assembled in the brake support connecting hole through a fourth pin shaft.

[0015] As a further improvement of the utility model, the fourth pin shaft is fixed by a third split pin.

[0016] The utility model has the advantages of:

[0017] 1. A third brake is added to the pull arm mechanism to improve the safety performance of the mechanism;

[0018] 2. The opening and closing of the ratchet pawl are controlled by the hydraulic push rod action, which plays the role of the brake;

[0019] 3. The ratchet is installed on the drum side plate, and the ratchet pawl brake is installed on one side of the cylinder, which is compact in structure and convenient and reliable to install and maintain. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a structure diagram of the ratchet brake device on the pull arm mechanism of the utility model;

[0021] Reference signs: 1, brake ratchet, 2, high-strength bolt, 3, elastic cylindrical pin, 4, drum side plate, 5, brake support, 6, brake pawl, 7, first pin shaft, 8, first split pin, 9, spring, 10, second pin shaft, 11, hydraulic push rod, 12, third pin shaft, 13, second split pin, 14, fourth pin shaft, 15, third split pin. DETAILED DESCRIPTION

[0022] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. The embodiments described are shown in the drawings. Conversely, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0023] As Figure 1As shown, a ratchet brake device on a pull arm mechanism includes a brake ratchet 1, a brake pawl 6 and a hydraulic push rod 11, the brake ratchet 1 is installed with a drum side plate 4 through a high-strength bolt 2 and an elastic cylindrical pin 3, the brake pawl 6 is assembled with a brake support 5 through a first pin shaft 7, a second pin shaft 10 is assembled in the middle hole of the brake support 5, the upper part of the brake pawl 6 is hung with the upper part of a spring 9, and the lower part of the spring 9 is hung on the second pin shaft 10. The brake support 5 is welded with a mechanism base frame. The first pin shaft 7 is fixed through a first split pin 8. The middle hole of the brake support 5 has three groups, so that the second pin shaft 10 can be assembled at different positions of the three groups of holes. The upper part of the hydraulic push rod 11 is a push rod head hole capable of stretching and retracting, the push rod head hole is assembled in a connecting hole at the rear part of the brake pawl 6 through a third pin shaft 12. The third pin shaft 12 is fixed through a second split pin 13. The connecting hole of the lower part of the push rod body of the hydraulic push rod 11 is assembled in a connecting hole of the brake support 5 through a fourth pin shaft 14. The fourth pin shaft is fixed through a third split pin 15.

[0024] After the device is powered on, the brake ratchet 1 and the brake pawl 6 are driven to separate from each other by the action of the hydraulic push rod 11, so that the pull arm mechanism can work normally. Once the device is shut down or encounters an emergency power failure, the brake pawl 6 is automatically reset by the restoring force of the spring 9, engages with the brake ratchet 1, and realizes the brake function, thereby improving the safety performance of the device as a third brake on the pull arm mechanism.

[0025] Specifically, when the device is started, the hydraulic push rod 11 is powered on in advance, and then the push rod is extended. At this time, the brake pawl 6 rotates around the first pin shaft 7, so as to be separated from the gear of the brake ratchet 1, so that the drum side plate 4 can freely act and work normally.

[0026] When the device is not started or encounters an emergency stop, the device will be powered off. At this time, the hydraulic push rod 11 is retracted under the action of the pulling force of the spring 9, and drives the brake pawl 6 to rotate around the first pin shaft 7. When the brake pawl 6 contacts the gear of the brake ratchet 1, the action of the drum side plate 4 is limited, thereby playing a braking role.

[0027] The above-described embodiments only express several implementation manners of the utility model, the description is more specific and detailed, but it cannot be understood as a limitation on the scope of the utility model patent. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the utility model, a number of modifications and improvements can be made, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent should be subject to the appended claims.

Claims

1. A ratchet brake device on a pull arm mechanism, characterized in that, The brake ratchet (1) is installed with the drum side plate (4) through high-strength bolt (2) and elastic cylindrical pin (3), the brake pawl (6) is assembled with the brake support (5) through the first pin shaft (7), the second pin shaft (10) is assembled in the middle hole of the brake support (5), the upper part of the spring (9) is hung on the round ring of the brake pawl (6), and the lower part of the spring (9) is hung on the second pin shaft (10).

2. The ratchet brake on pull arm mechanism of claim 1, wherein, The brake support (5) is welded with the pull arm mechanism chassis.

3. A ratchet brake on a pull arm mechanism according to claim 2, characterised in that, The first pin shaft (7) is fixed through the first split pin (8).

4. The ratchet brake on pull arm mechanism of claim 3, wherein, The middle hole of the brake support (5) has three groups, so that the second pin shaft (10) can be assembled at different positions of the three groups of holes.

5. The ratchet brake on pull arm mechanism of claim 1 wherein, The upper part of the hydraulic push rod (11) is a telescopic push rod head hole, and the push rod head hole is assembled in the rear connecting hole of the brake pawl (6) through the third pin shaft (12).

6. A ratchet brake device on a pull arm mechanism according to claim 5, characterised in that, The third pin shaft (12) is fixed with the second split pin (13).

7. The ratchet brake on pull arm mechanism of claim 5 wherein, The connecting hole of the lower push rod body of the hydraulic push rod (11) is assembled in the connecting hole of the brake support (5) through the fourth pin shaft (14).

8. The ratchet brake on pull arm mechanism of claim 7, wherein, The fourth pin shaft (14) is fixed with the third split pin (15).

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