A ratchet assembly of a ratchet type automatic compensation device for an industrial brake

Abstract

The present invention relates to a ratchet assembly of a ratchet-type automatic compensation device of an industrial brake, which is composed of a ratchet, a brake pull rod, a protective tube cover, a protective tube, a set screw, a sealing ring, a square pin, and a ratchet cover. The main structural features and beneficial effects are: after the ratchet assembly is assembled, on the one hand, the vibration prevention problem of the automatic compensation device can be well solved through the mutual constraint of the assembled parts, and the occurrence of the "over-compensation" problem can be avoided; on the other hand, a ratchet cavity is formed in the ratchet after the ratchet, the ratchet cover, and the brake pull rod are assembled; a protective tube cavity is formed in the protective tube after the protective tube cover, the protective tube, the brake pull rod, and the ratchet are assembled, and grease is added to the above cavity, and there are lubrication holes and lubrication grooves on the ratchet. During the action of the ratchet assembly, it can play a good role in protecting and lubricating the compensation thread and the rotation of the ratchet, and solve the problems of blocking and rusting existing in the ratchet-type automatic compensation device of the industrial brake. The use of an improved structure enhances the ability of the ratchet-type automatic compensation device to adapt to various environmental conditions, and achieves the effect of long-term stable use.

Description

Technical Field

[0001] The invention relates to a ratchet type automatic compensation device for an industrial brake, in particular to a ratchet assembly for the ratchet type automatic compensation device for an industrial brake. Background Art

[0002] Industrial brakes are widely used in various mechanical equipment such as lifting, belt transportation, port loading and unloading, and metallurgy. They are used to stop and brake various mechanical transmissions and maintain the braking state. Since brake pads are consumable parts, they will wear out during use. When they are worn to a certain extent, the brake function of the brake will fail. To solve this problem, one is to rely on regular manual maintenance and frequent adjustment of the brake lever; the other is to use an automatic compensation device to compensate for the wear of the brake pads. Manual maintenance can no longer meet the requirements of high efficiency, reliability, and automation in modern industrial production. The existing one-way bearing compensation device has problems such as "over-compensation" or "no compensation" and requires professionals to make fine adjustments, which cannot be widely used in industrial brakes. In the utility model patents "An automatic compensation device for industrial drum brakes" (application number: 201320388304.0) and "An automatic compensation device and brake using the same" (application number: 200420068957.1), an automatic compensation device using a ratchet method is disclosed. The device is composed of a ratchet assembly, a lever assembly, a lever, a brake frame, etc.; the ratchet assembly includes a ratchet, a square pin, a brake rod, a locking nut, etc., and the lever assembly includes a spring, a pawl or a paddle, a support or a sleeve, etc. There are two ways to install the ratchet: one is that the ratchet and the square pin form a rotating pair through a shoulder and a locking nut, and the ratchet and the brake rod are connected through a threaded pair; the other way is that the ratchet and the brake rod are fixedly connected as a whole, and then the shoulder of the brake rod and the locking nut form a rotating pair with the square pin. This type of compensation device can be used immediately after being installed on the brake, and no on-site adjustment is required. In addition, the compensation device has a good compensation effect when the parts are not damaged, and is gradually being recognized by users. The invention patent "A lever assembly of a ratchet-type compensation device for industrial brakes" (application number: 201510725151.8) has improved the lever assembly part of the automatic compensation device, achieving the effect of popularization and application. However, due to the limitations of the structural dimensions and other factors required for the compensation action to match each other, the ratchet part of the ratchet-type automatic compensation device published above is basically exposed, lacking technical means such as vibration prevention, dust prevention, and rust prevention. During on-site use, the ratchet and the threaded pair used for compensation have serious faults such as stuck and rusted, and even have the problem of "over-compensation", which cannot achieve the effect of automatic compensation without manual maintenance, hindering the popularization and application of ratchet-type compensation devices. Only by solving the problem of stable operation of the ratchet assembly and matching it with the aforementioned lever assembly can the real effect of industrial brakes being free of manual maintenance be achieved. Summary of the invention

[0003] The purpose of the present invention is to solve the problems of vibration prevention, jamming and rusting of the above industrial brake ratchet automatic compensation device, and to achieve the effect of long-term stable use of the ratchet automatic compensation device by adopting an improved structure.

[0004] The technical solution adopted by the present invention is: a ratchet assembly of a ratchet-type automatic compensation device of an industrial brake, comprising a ratchet, wherein a ratchet shaft, a ratchet shoulder and ratchet teeth are arranged on the outside of the ratchet, a ratchet center hole is arranged inside the ratchet, and a ratchet internal thread is arranged at a corresponding position inside the ratchet shaft; the ratchet assembly also comprises a protective tube, a set screw, and a square pin, wherein the square pin is provided with a square pin hole, the ratchet shaft passes through the square pin hole, and is then connected to the protective tube in a shaft and hole manner, and the set screw is used to fasten the protective tube to the ratchet shaft, the ratchet is axially positioned by the ratchet shoulder, and the protective tube The rear end face is fitted with the side face of the square pin, and the square pin is installed on the lever; the ratchet assembly also includes a brake rod, and after the ratchet shaft passes through the square pin hole, the brake rod is connected to the ratchet through the internal thread of the ratchet, and the other end of the brake rod is fixedly connected to the pin shaft of the brake arm; the ratchet assembly also includes a protective tube cover, which is arranged at the front end of the protective tube; the ratchet assembly also includes a ratchet cover, and the ratchet cover is installed at the end of the ratchet center hole; the ratchet center hole and the brake rod and the ratchet cover form a ratchet cavity; a protective tube cavity is formed between the protective tube and the brake rod.

[0005] Furthermore, the square pin is provided with a square pin countersunk hole, which is internally provided with a sealing ring.

[0006] Furthermore, the ratchet is provided with a lubrication hole and a lubrication groove in the matching range between the ratchet shaft and the square pin hole, and the lubrication hole and the lubrication groove are communicated with the ratchet cavity.

[0007] Furthermore, the length of the ratchet cavity, the protective tube cavity and the protective tube cover is greater than the length of the compensating thread on the brake rod.

[0008] The working principle of the present invention is: when the brake is working, the brake rod is fixed and does not rotate, and the ratchet assembly is restricted by the structure and assembly relationship after assembly. The rotation of the ratchet is only controlled by the lever assembly, which can effectively avoid the influence of the vibration of the equipment where the brake is located and the brake itself, thereby ensuring the accuracy of the operation of the ratchet assembly and avoiding the occurrence of "over-compensation" problems. The compensating thread is placed in a closed cavity, and grease is added to the ratchet cavity and the protective tube cavity. In addition to lubricating the compensating thread, the grease in the protective tube cavity also prevents external water, dust and corrosive gas from damaging the compensating thread; when the ratchet assembly and the lever assembly are installed on the brake and put into use, as the automatic compensation proceeds, the lever of the lever assembly drives the ratchet to rotate, and the external thread of the brake rod gradually extends into the ratchet cavity. While completing the compensation action, the volume of the ratchet cavity is gradually reduced, and the grease added therein is squeezed into the matching surface of the ratchet shaft and the square pin hole through the lubrication hole and the lubrication groove, completing the lubrication of the rotating pair formed by the ratchet shaft and the square pin hole, and the grease is prevented from losing through the sealing ring in the square pin countersunk hole. When the brake pad needs to be replaced after being worn, grease is added to the above cavity again.

[0009] The beneficial effects of the present invention are as follows:

[0010] 1. Since the original automatic compensation device fixes the ratchet to the brake rod or sets the compensation thread at the ratchet tooth position, and the automatic rod rotates during compensation, the vibration will be transmitted to the ratchet and cause the circumferential position of the ratchet teeth to change, affecting the accuracy of the compensation operation. The present invention fixes the brake rod and uses the mutual restraint and good lubrication of the various parts of the ratchet assembly to effectively avoid the influence of vibration on the automatic compensation device, eliminate the "over-compensation" problem, and ensure the long-term stable operation of the automatic compensation device.

[0011] 2. Adding grease into the ratchet cavity can lubricate the compensating thread of the brake rod on the one hand, and more importantly: while using the brake mechanism to perform automatic compensation, the compensation action can be used to continuously add grease to the mating surface of the ratchet shaft and the square pin hole for a long time to ensure the flexible operation of the ratchet and prevent the ratchet from getting stuck due to rust or other reasons.

[0012] 3. The brake rod compensating thread is placed in the protective tube, and grease is added to the protective tube cavity. While ensuring the flexible operation of the compensating thread, it can prevent external dust from adhering to the brake rod compensating thread, and prevent water, dust, corrosive gas, etc. from rusting the brake rod compensating thread, avoiding the occurrence of compensation failure caused by blocking and jamming.

[0013] 4. The structural treatment of the ratchet assembly not only adapts well to the various environmental conditions, geometric dimensions, installation dimensions and other requirements of the brake for the compensation mechanism, but also can be well matched with the "lever assembly of a ratchet compensation device for an industrial brake" (application number: 201510725151.8), completely solving the problem of automatic compensation of industrial brakes. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 : Ratchet assembly drawing.

[0015] Figure 2 : Ratchet parts diagram.

[0016] Figure 3 : Figure 2 AA cross-section diagram.

[0017] Figure 4 : Figure 2 BB cross-section diagram.

[0018] Figure 5 : Square pin parts drawing.

[0019] Figure 6 : Figure 5 CC cross-section diagram.

[0020] Figure 7 : Schematic diagram of ratchet type automatic compensation device.

[0021] Figure 8 : An embodiment of a brake equipped with a ratchet assembly of the present invention.

[0022] The corresponding parts names in the figure are as follows:

[0023] The components include: a ratchet assembly 1, a lever assembly 2, a lever 3, and a brake frame 4;

[0024] The parts of the ratchet assembly include: a brake pull rod 11, a protective tube cover 12, a protective tube 13, a set screw 14, a sealing ring 15, a square pin 16, a ratchet 17, and a ratchet cover 18.

[0025] The identification of the structural features of the parts in the figure are explained as follows:

[0026] Ratchet cavity 19, protective tube cavity 20, compensating thread length L, ratchet cavity length K, protective tube cavity and protective tube cover length M, ratchet internal thread 171, lubrication groove 172, ratchet shaft 173, ratchet teeth 174, ratchet center hole 175, ratchet shaft shoulder 176, lubrication hole 177, square pin countersunk hole 161, square pin hole 162, square pin short shaft 163. DETAILED DESCRIPTION

[0027] The main structural features and operating principles of the present invention are further described below in conjunction with the accompanying drawings.

[0028] Figure 2 , Figure 3 and Figure 4 The structural features of the ratchet 17 are shown: a ratchet shaft 173 is provided at one end of the ratchet 17, a ratchet tooth 174 is provided at the other end, and a ratchet shaft shoulder 176 is provided therebetween; the center of the ratchet 17 is a through hole, the through hole is coaxial with the ratchet shaft 173 and the ratchet tooth 174, one end of the through hole is a ratchet internal thread 171, and the other end is a ratchet center hole 175; within the matching range of the ratchet shaft 173 and the square pin hole 162, a lubrication hole 177 and a lubrication groove 172 are provided on the ratchet shaft 173, and are connected to the ratchet center hole 175.

[0029] Figure 5 and Figure 6 The structural features of the square pin 16 are shown: the two ends of the square pin 16 are short axes 163, the middle is square, the middle square part has a square pin hole 162 in a direction perpendicular to the square pin short axis 163, and one end of the square pin hole 162 has a square pin countersunk hole 161.

[0030] Figure 1 The ratchet assembly 1 includes a brake pull rod 11, a protective tube cover 12, a protective tube 13, a set screw 14, a sealing ring 15, a square pin 16, a ratchet 17, and a ratchet cover 18. The assembly relationship is as follows: the ratchet shaft 173 passes through the square pin hole 162 with a clearance fit, and is then connected to the protective tube 13 with a shaft and hole clearance fit, and the protective tube 13 is fastened to the ratchet shaft 173 with a set screw 14, the ratchet 17 is axially positioned by the ratchet shaft shoulder 176, and the rear end face of the protective tube 13 fits with the side face of the square pin 16; the end of the brake rod 11 has an external thread, wherein the length of the compensating thread for lining wear is L, the brake rod 11 is connected to the ratchet internal thread 171 through the external thread, and the other end of the brake rod 11 is fixedly connected to the pin shaft of the brake arm; the ratchet cover 18 is interference fit at the end of the ratchet center hole 175; the protective tube cover 12 is interference fit at the front end of the protective tube 13; a sealing ring 15 is installed in the square pin countersunk hole 161, and the two sides of the sealing ring 15 are tightly fit with the square pin countersunk hole 161 and the rear end face of the protective tube 13, and the inner circle of the sealing ring 15 is tightly fit with the ratchet shaft 173. After assembly, the ratchet wheel 17, the ratchet wheel cover 18, and the brake rod 11 form a ratchet wheel cavity 19 in the ratchet wheel center hole 175; the protective tube cover 12, the protective tube 13, the brake rod 11, and the ratchet wheel 17 form a protective tube cavity 20 in the protective tube. After assembly, the ratchet wheel assembly 1 is mounted on the lever 3 through the square pin short shaft 163.

[0031] It should be noted that: Figure 7 The middle lever assembly 2, the lever 3, etc. are not within the scope of protection of the present invention and are therefore indicated by double-dotted lines.

[0032] See also Figure 1 and Figure 7 The working principle of the present invention is: since the brake rod 11 is fixed and does not rotate, and the ratchet assembly 1 is limited by the friction resistance between the structure and the parts generated after assembly after assembly, the influence of vibration on the operation of the ratchet can be effectively avoided. After the ratchet assembly 1 is assembled, the ratchet 17 and the protective tube 12 can rotate synchronously in the square pin hole 162, but cannot move axially; grease is added to the ratchet cavity 19 and the protective tube cavity 20; when compensation is not required, the lever 3 drives the lever assembly 1 to slide between the teeth of the ratchet teeth 174 during the swinging process; when the lining wear needs to be compensated, the lever 3 drives the lever assembly 1 to move the ratchet 17 during the upward swinging process, and the ratchet 17 rotates one tooth pitch; the brake rod 11 does not rotate when the brake is working, so the compensation action is achieved by tightening the brake arms on both sides through the external thread of the brake rod 11 and the internal thread 171 of the ratchet, and the external thread of the brake rod 11 The groove gradually extends into the ratchet cavity 19, and the volume of the ratchet cavity 19 gradually decreases. The grease is squeezed into the matching surface of the ratchet 17 and the square pin 16 through the lubrication hole 177 and the lubrication groove 172, so as to achieve the purpose of lubrication and prevent rust, and ensure the flexible operation of the ratchet during compensation; a sealing ring 15 is installed in the square pin countersunk hole 161, which fits tightly with the square pin countersunk hole 161, the ratchet shaft 173 and the rear end surface of the protective tube 13, and prevents the loss of grease; grease is also added in the protective tube cavity 20 to achieve lubrication of the compensation thread, and at the same time prevent external dust from adhering to the compensation thread of the brake rod, and corrosive gas from corroding the compensation thread of the brake rod.

[0033] like Figure 1 As shown, the length of the brake rod compensating thread is L, the length of the ratchet cavity is K, the length of the protective tube cavity and the protective tube cover is M, K and M are greater than L, the compensating thread is placed in a closed cavity, and at the same time, the operation of the brake rod 11 is not hindered during the service life of the brake pad.

[0034] When the brake lining is replaced, the brake rod 11 can be screwed out and the grease can be replenished.

[0035] The structure shown in the present invention does not exclude changes in the local structure of the parts and the assembly means to achieve the functional requirements, such as changing the ratchet cover to a detachable type, changing the protective tube and the ratchet shaft to a threaded pair connection, etc.

[0036] Example 1: See Figure 8When the present invention is used for drum brakes or conical brakes, the ratchet assembly 1 is installed in the pin hole of the brake lever 3 through the square pin short shaft 163, and the other end of the brake pull rod 11 is fixedly connected to the pin shaft of the brake arm. The brake frame 4 of this embodiment includes brake arms, springs, pushers, brake shoes, bases and other parts. When the pusher pushes the lever 3 to swing, the lever assembly 2 can move the ratchet 17 of the ratchet assembly 1 to rotate. Through good lubrication and the restraint of the mutual assembly of parts, the effect of ensuring the flexible operation of the mechanism and stable compensation can be achieved for a long time.

[0037] Embodiment 2: When the present invention is used for an electric hydraulic disc brake, the ratchet assembly 1 is mounted on the brake lever 3, and its operating principle is the same as that of embodiment 1.

Claims

1. A ratchet assembly of a ratchet type automatic compensation device for an industrial brake, characterized by: The invention comprises a ratchet (17), wherein the ratchet (17) is provided with a ratchet shaft (173), a ratchet shaft shoulder (176) and ratchet teeth (174) on the outside, a ratchet center hole (175) is provided on the inside of the ratchet (17), and a ratchet internal thread (171) is provided on the corresponding position of the ratchet shaft (173); the ratchet assembly (1) also comprises a protective tube (13), a set screw (14), and a square pin (16), wherein the square pin (16) is provided with a square pin hole (162), and the ratchet shaft (173) passes through the square pin hole (162). The protective tube (13) is connected to the ratchet shaft (173) by a shaft and a hole (162), and the protective tube (13) is fastened to the ratchet shaft (173) by a set screw (14). The ratchet (17) is axially positioned by a ratchet shaft shoulder (176). The rear end surface of the protective tube (13) is in contact with the side surface of the square pin (16), and the square pin (16) is mounted on the lever (3). The ratchet assembly (1) also includes a brake pull rod (11). After the ratchet shaft (173) passes through the square pin hole (162), The brake rod (11) is connected to the ratchet (17) via the ratchet internal thread (171), and the other end of the brake rod (11) is fixedly connected to the pin of the brake arm; the ratchet assembly (1) also includes a protective tube cover (12) arranged at the front end of the protective tube (13); the ratchet assembly (1) also includes a ratchet cover (18), and the ratchet cover (18) is installed at the end of the ratchet center hole (175); the ratchet center hole (175) and the brake rod (11) are connected to the ratchet cover ( 18) forms a ratchet cavity (19); a protective tube cavity (20) is formed between the protective tube (13) and the brake pull rod (11); the ratchet (17) is provided with a lubrication hole (177) and a lubrication groove (172) in the matching range between the ratchet shaft (173) and the square pin hole (162), and the lubrication hole (177) and the lubrication groove (172) are connected to the ratchet cavity (19); the length of the ratchet cavity (K), the protective tube cavity and the protective tube cover (M) are greater than the compensation thread length (L) on the brake pull rod.

2. The ratchet assembly of the ratchet type automatic compensation device of an industrial brake according to claim 1, characterized in that: The square pin (16) is provided with a square pin countersunk hole (161) which contains a sealing ring (15).

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