Braking speed limiting device

Abstract

The present invention discloses a braking speed limiting device, comprising: a brake housing, a power input mechanism, a speed limiting mechanism and a braking mechanism; the speed limiting mechanism comprises: a brake disc, a speed limiting block, a friction plate and a first elastic element; when the power input mechanism inputs torque, the speed limiting block is driven to rotate, and the speed limiting block is swung toward the inner wall of the brake housing under the action of centrifugal force, so that the friction plate installed on the speed limiting block contacts the inner wall of the brake housing to generate friction, thereby playing a speed limiting role; the braking mechanism comprises: a manual trigger device, a cam body, a brake ring, a second elastic element and a brake pad; the manual trigger device drives the cam body to rotate, and the brake ring is installed on the eccentric part of the cam body. When the cam body rotates, the brake ring is driven to move radially, so that the brake pad installed on the brake ring is disengaged or tightly holds the brake disc, and the brake disc is linked with the power input mechanism, thereby realizing braking control. The present invention has the advantages of convenient control, automatic speed limiting, reliable braking, etc., and is suitable for various hydraulic winches.

Description

Technical Field

[0001] The invention relates to the technical field of braking devices, and in particular to a braking speed limiting device for a hydraulic winch. Background Art

[0002] Hydraulic winches are widely used for lifting or flat-hauling materials in the fields of marine engineering, construction, water conservancy engineering, forestry, mining, docks, etc., and have the advantages of compact structure, good safety, high efficiency, and reliable operation. Hydraulic winches are mainly composed of hydraulic motors, brakes, reduction boxes, clutches, drums and other components. When using hydraulic winches to lower heavy objects, in order to limit the maximum speed of the drum, a speed limiting mechanism (i.e., brake speed limiting device) is usually installed in the brake. In the prior art, the speed limiting mechanism of the brake is usually complex in structure and inconvenient to operate. Summary of the invention

[0003] In order to solve the above technical problems, an object of the present invention is to provide a braking speed limiting device, which has the advantages of simple structure, convenient operation, reliable operation, etc.

[0004] In view of the above problems, a technical solution adopted by the present invention is: to provide a braking speed limiting device, characterized in that it comprises: a brake housing, a power input mechanism, a speed limiting mechanism and a braking mechanism;

[0005] The speed limiting mechanism comprises: a brake disc, a speed limiting block, a friction plate and a first elastic element; the brake disc is linked to the power input mechanism, one end of the speed limiting block is hinged on the brake disc, and the other end is installed with the friction plate, and the first elastic element is supported between the speed limiting block and the brake disc; when the power input mechanism inputs torque, the brake disc is driven to rotate, and the speed limiting block installed on the brake disc swings toward the inner wall of the brake housing under the action of centrifugal force, so that the friction plate contacts the inner wall of the brake housing to generate friction, thereby playing a speed limiting role;

[0006] The braking mechanism includes: a manual trigger device, a cam body, a brake ring, a second elastic element and a brake pad; the manual trigger device is linked to the cam body, the cam body is provided with an eccentric portion, the brake ring is installed on the eccentric portion, and the brake pad is installed on the brake ring; the cam body has a first position and a second position under the action of the manual trigger device, when the cam body is in the first position, the brake pad is disengaged from the power input mechanism and the braking state is released; when the cam body is in the second position, the brake pad holds the power input mechanism to achieve braking control; the second elastic element is supported between the brake housing and the manual trigger device.

[0007] Through the above-mentioned setting, the speed limiting mechanism relies on the rotation speed input by the power input mechanism and utilizes the centrifugal force generated by the rotation of the speed limiting block to achieve maximum speed control. The higher the rotation speed of the power input mechanism, the greater the centrifugal force of the speed limiting block, and thus the greater the dynamic friction between the friction plate and the brake housing, thereby achieving maximum speed control of the power input mechanism; the braking mechanism realizes manual braking control by triggering the manual trigger device.

[0008] Furthermore, the power input mechanism includes a rotating shaft, and the rotating shaft passes through the center of the brake housing.

[0009] Through the above arrangement, the rotating shaft can be connected to the winding mechanism of the hydraulic winch through the transmission device, thereby achieving control of the maximum lowering speed when the hydraulic winch lowers the heavy object.

[0010] Furthermore, the relationship between the stiffness k of the first elastic element and the rotation speed n of the rotating shaft follows the following formula: n=sqrt(f l / w x / r x *1000) / 2 / 3.14*60, where f l =FK, F is the centrifugal force generated by the speed limit block due to the speed n without the action of the first elastic element, K is the spring force of the first elastic element acting on the speed limit block at the speed n, K=k·x, where x is the displacement of the first elastic element at the speed n; w x is the mass of the speed limit block, and r x is the distance from the hinge center point of the speed limit block to the friction plate. The relationship between n and k can be summarized as follows: the smaller the stiffness k of the first elastic element is, the smaller the restriction on the rotation speed n of the rotating shaft will be.

[0011] Furthermore, the dynamic friction coefficient μ of the friction plate is k The braking torque T of the speed limit block axis r is proportional to the dynamic friction coefficient μ k The larger the braking torque T of the speed limit block axis is, the r The larger the dynamic friction coefficient μ of the friction plate is, k The braking torque T of the speed limit block axis r The relationship between follows the following formula: r =f wt *R / 2-f wt / μ k ·L y , where the f wt is the positive pressure of the friction plate on the brake disc at the speed n, R is the radius of the brake disc, and L yis the lever arm of the speed limit block, that is, the distance from the center of the rotating shaft to the friction plate.

[0012] Through the above settings, k, n, μ k It is the key control parameter of the speed limiting mechanism, and the relationship between the three limits the maximum output speed.

[0013] Furthermore, the cam body is movably mounted on the rotating shaft, the brake ring is sleeved on the cam body, a groove is arranged on the brake ring along its rotation direction, a stop pin is radially arranged on the brake housing, and the stop pin is clamped in the groove.

[0014] Through the above arrangement, the brake ring is limited in the rotation direction.

[0015] Furthermore, the speed limit block includes a first speed limit block and a second speed limit block symmetrically installed on the brake disc, the second elastic element includes a second elastic element one and a second elastic element two, the second elastic element one is supported between the movable end of the first speed limit block and the hinged end of the second speed limit block, and the second elastic element two is supported between the movable end of the second speed limit block and the hinged end of the first speed limit block.

[0016] Through the above arrangement, the structure of the speed limiting mechanism is made more stable.

[0017] Furthermore, the manual trigger device includes: a handle; the handle is connected to the cam body via a spline: the handle is mounted on a spline sleeve, the cam body is mounted with a spline, and the second elastic element is supported between the brake housing and the spline sleeve.

[0018] Through the above arrangement, the braking control is convenient and reliable.

[0019] Furthermore, the speed limiting mechanism and the brake ring are integrated and installed inside the brake housing, and the spline sleeve and the handle are arranged outside the brake housing.

[0020] Through the above arrangement, the structure of the entire device is made more compact.

[0021] Furthermore, the brake pad achieves braking by holding the brake disc tightly.

[0022] The beneficial effects of the present invention are simple structure, reliable braking, automatic speed limit and convenient control. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural cross-sectional view of a preferred embodiment of the present invention;

[0024] Figure 2 yes Figure 1 Right view of;

[0025] Figure 3 yes Figure 1 Cross-sectional view of section EE;

[0026] Figure 4 yes Figure 1 Cross-sectional view of the FF section;

[0027] Figure 5 is a curve diagram showing the relationship between the rotation speed n and the spring force K in the embodiment of the present invention. DETAILED DESCRIPTION

[0028] The technical features and advantages of the present invention are described in more detail below in conjunction with the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0029] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0030] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0031] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] The embodiment of the present invention is a brake speed limiting device for a hydraulic winch, see Figure 1-4 The braking speed limiting device of the embodiment of the present invention specifically includes: a brake housing 1, a cover plate 10, a rotating shaft 8, a braking mechanism and a speed limiting mechanism.

[0033] The speed limiting mechanism comprises: a brake disc 2, a speed limiting block 11a, a speed limiting block 11b, a friction plate 12, a tension spring 13a and a tension spring 13b; the brake disc 2 is fixedly mounted on the rotating shaft 8, one end of the speed limiting block 11a and the speed limiting block 11b are hinged on the brake disc 2, and the other end is installed with a friction plate 12, the tension spring 13a is supported between the movable end of the speed limiting block 11a and the hinged end of the speed limiting block 11b, and the tension spring 13b is supported between the movable end of the speed limiting block 11b and the hinged end of the speed limiting block 11a; when the rotating shaft 8 rotates, the brake disc 2 is driven to rotate, and the two speed limiting blocks installed on the brake disc 2 swing toward the inner wall of the brake housing 1 under the action of centrifugal force, so that the friction plate 12 contacts the inner wall of the brake housing 1 to generate friction, thereby playing a speed limiting role.

[0034] The braking mechanism includes: a handle 17, a spline sleeve 7, a cam body 6, a brake ring 5, a spring 16, a stop pin 4 and a brake pad 3; the cam body 6 is movably mounted on the rotating shaft 8 through a needle bearing 14, and the brake ring 5 is mounted on the cam body 6; the handle 17 is mounted on the spline sleeve 7, the cam body 6 is equipped with splines through screws 9, and the brake pad 3 is mounted on the brake ring 5 through screws; a groove 501 is provided on the brake ring 5, and a stop pin 4 is installed on the brake housing 1, and the brake ring 5 is limited in the rotation direction by the stop pin 4; the spring 16 is supported between the spline sleeve 7 and the cover plate 10.

[0035] The braking speed limiting device of the present invention manually releases the braking state in the following manner: first pull the handle 17 (from position A to position B in the figure), the handle 17 drives the spline sleeve 7 to rotate, the spline sleeve 7 is locked with the cam body 6 through the spline, thereby driving the cam body 6 to rotate, because the cam body 6 is engaged with the brake ring 5, and the brake pad 3 is installed on the brake ring 5, so when the cam body 6 rotates, it drives the brake ring 5 and the brake pad 3 to rotate and moves radially toward the brake housing 1, so that the brake pad 3 releases the brake disc 2, thereby releasing the brake.

[0036] When braking measures are required, the handle 17 is released, and the spline sleeve 7 and the handle 17 rotate and reset under the action of the spring 16 (from position B to position A in the figure). The spline sleeve 7 then drives the cam body 6 to rotate through the spline. Therefore, when the cam body 6 rotates, it drives the brake ring 5 and the brake pad 3 to rotate and move radially toward the brake disc 2, so that the brake pad 3 and the brake disc 2 are tightly held, thereby achieving braking.

[0037] The control point of the speed limiting mechanism of the braking speed limiting device of the present invention lies in: the relationship between the stiffness k of the tension spring 13a and the tension spring 2 13b and the rotation speed n of the rotating shaft 8, and the dynamic friction coefficient μ of the friction plate 12 k Braking torque T with the axis of the speed limit block r The relationship between the stiffness k and the rotation speed n of the shaft 8 follows the following formula: n = sqrt (fl / w x / r x *1000) / 2 / 3.14*60, where f l =FK, F is the centrifugal force generated by the speed limit block without the action of the tension spring due to the speed n, K = k x is the spring force of the tension spring acting on the speed limit block, x is the displacement of the tension spring at the speed n; w x is the mass of the speed limiting block, r x is the distance from the hinge center of the speed limiter to the friction plate 12; the relationship between n and k can be summarized as follows: the smaller the stiffness k, the smaller the restriction on the rotation speed n of the shaft 8. Figure 5 , which is a relationship curve between the rotation speed n (vertical axis) of the rotating shaft 8 and the spring force K (horizontal axis).

[0038] The dynamic friction coefficient μ of the friction plate 12 k Braking torque T with the axis of the speed limit block r is proportional to the dynamic friction coefficient μ k The larger the braking torque T of the speed limit block axis is, the r The larger μ k With T r The relationship between follows the following formula: r =f wt *R / 2-f wt / μ k ·L y , where f wt is the positive pressure of the friction plate 12 on the brake disc 2 when the speed limit block is at a speed n, R is the radius of the brake disc 2, and L y is the lever arm of the speed limiter, i.e. the distance from the center of the rotating shaft 8 to the friction plate 12.

[0039] Through the above arrangement, the speed limiting mechanism can utilize the centrifugal force of the speed limiting block and the dynamic friction of the friction plate 12 when the shaft 8 rotates to effectively realize the maximum speed control of the shaft 8; further, the manual braking trigger and braking release can be realized through the braking mechanism. It has the advantages of simple structure, convenient control, stable operation, etc., and can be applied to the braking speed limiting control of various hydraulic winches.

[0040] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A braking speed limiting device, characterized in that: include: Brake housing, power input mechanism, speed limiting mechanism and braking mechanism; The speed limiting mechanism comprises: a brake disc, a speed limiting block, a friction plate and a first elastic element; the brake disc is linked to the power input mechanism, one end of the speed limiting block is hinged on the brake disc, and the other end is installed with the friction plate, and the first elastic element is supported between the speed limiting block and the brake disc; when the power input mechanism inputs torque, the brake disc is driven to rotate, and the speed limiting block installed on the brake disc swings toward the inner wall of the brake housing under the action of centrifugal force, so that the friction plate contacts the inner wall of the brake housing to generate friction, thereby playing a speed limiting role; The brake mechanism comprises: a manual trigger device, a cam body, a brake ring, a second elastic element and a brake pad; the manual trigger device is linked to the cam body, the cam body is provided with an eccentric portion, the brake ring is mounted on the eccentric portion, and the brake pad is mounted on the brake ring; the cam body has a first position and a second position under the action of the manual trigger device, when the cam body is in the first position, the brake pad is disengaged from the power input mechanism and the braking state is released; when the cam body is in the second position, the brake pad holds the power input mechanism tightly to achieve braking control; the second elastic element is supported between the brake housing and the manual trigger device; The power input mechanism includes a rotating shaft, and the rotating shaft is arranged through the center of the brake housing; The relationship between the stiffness k of the first elastic element and the rotation speed n of the rotating shaft follows the following formula: n=sqrt(f l / w x / r x *1000) / 2 / 3.14*60, where f l =FK, F is the centrifugal force generated by the speed limit block due to the speed n without the action of the first elastic element, K is the spring force of the first elastic element acting on the speed limit block at the speed n, K=k·x, where x is the displacement of the first elastic element at the speed n; w x is the mass of the speed limit block, and r x is the distance from the hinge center point of the speed limit block to the friction plate; The dynamic friction coefficient μ of the friction plate k The braking torque T of the speed limit block axis r The relationship between follows the following formula: r =f wt *R / 2-f wt / μ k ·L y , where the f wt is the positive pressure of the friction plate on the brake disc at the speed n, R is the radius of the brake disc, and L y is the lever arm of the speed limit block.

2. A braking speed limiting device according to claim 1, characterized in that: The cam body is movably mounted on the rotating shaft, the brake ring is sleeved on the cam body, a groove is arranged on the brake ring along its rotation direction, a stop pin is arranged radially on the brake housing, and the stop pin is clamped in the groove.

3. A braking speed limiting device according to claim 1, characterized in that: The speed limit block includes a first speed limit block and a second speed limit block symmetrically installed on the brake disc, the second elastic element includes a second elastic element one and a second elastic element two, the second elastic element one is supported between the movable end of the first speed limit block and the hinged end of the second speed limit block, and the second elastic element two is supported between the movable end of the second speed limit block and the hinged end of the first speed limit block.

4. A braking speed limiting device according to claim 1, characterized in that: The manual trigger device comprises: a handle; the handle is connected to the cam body via a spline: the handle is mounted on a spline sleeve, the cam body is mounted with a spline, and the second elastic element is supported between the brake housing and the spline sleeve.

5. A braking speed limiting device according to claim 4, characterized in that: The speed limiting mechanism and the brake ring are integrally installed inside the brake housing, and the spline sleeve and the handle are arranged outside the brake housing.

6. A braking speed limiting device according to claim 1, characterized in that: The brake pad realizes braking control by holding the brake disc tightly.

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