wheel clamp

Abstract

The application relates to a wheel clamping device, which comprises a base, a hydraulic cylinder, brake arms and floating wheels. The base is suitable for being arranged on a walking wheel to be braked through a support. The hydraulic cylinder is arranged in the base and provides a reciprocating output driving force at an output end. The brake arms are even in number, two brake arms constitute a brake arm group, the two brake arms of each brake arm group are symmetrically arranged on the base, the rear end of the brake arm is drivingly connected with the output end of the hydraulic cylinder, and the front end is provided with a friction plate. The floating wheels are rotatable wheels and are even in number, two floating wheels constitute a floating wheel group, the two floating wheels in the group are correspondingly arranged with the friction plates of a brake arm group, the floating wheels roll against the two sides of the walking wheel to be braked in the wheel clamping device, the floating wheels continuously roll against the walking wheel, the interval distances of the two sides of the friction plates are ensured to be the same, the forces of the two sides of the friction plates are ensured to be uniform, and the local wear of the friction plates is greatly reduced.

Description

Technical Field

[0001] This application relates to the field of crane braking technology, and more particularly to a wheel clamp. Background Technology

[0002] Cranes, as large lifting and transportation equipment, are widely used in port, factory, infrastructure and other operation scenarios. In order to ensure the positional stability of the crane under braking state and to prevent the equipment from slipping due to strong winds or ground slope, the traveling mechanism must be equipped with a clamping wheel braking device to lock and brake the equipment by clamping the traveling wheels.

[0003] Existing hydraulic wheel clamps mainly rely on symmetrically arranged brake arms and friction pads to clamp the wheel tread to achieve braking and locking. However, traditional wheel clamps do not have a dedicated floating guide support structure. During the opening and closing or clamping braking process driven by the hydraulic cylinder, the distance between the traveling wheel and the friction pads on both sides is different, resulting in uneven clamping gaps between the friction pads on both sides and the wheel tread, and asymmetrical braking force. Under long-term operation, this can easily cause uneven wear of the wheel tread and excessive wear of the friction pads in certain areas, which seriously affects the parking safety of the crane. Summary of the Invention

[0004] In view of this, this application proposes a wheel clamping device, comprising: a base, a hydraulic cylinder, a brake arm, and a floating wheel; The substrate is designed to be mounted on a vehicle wheel that requires braking via a support frame. The hydraulic cylinder is located inside the base, and its output end provides a reciprocating extension and retraction output driving force. There are an even number of brake arms, and two brake arms form a group of brake arms. The two brake arms in each group are symmetrically arranged on the base, and the rear end of the brake arm is driven to the output end of the hydraulic cylinder, and the front end is provided with a friction plate. The floating wheels are rotatable wheels, and the number of them is even. Every two floating wheels form a group of floating wheels. The two floating wheels in a group are correspondingly arranged with the friction plates of a group of brake arms. When the wheel clamp is in use, the floating wheels roll and abut against the sides of the traveling wheel to be braked.

[0005] In one possible implementation, each set of brake arms is matched with two sets of floating wheel sets, which are respectively located at both ends of the friction plate in the length direction.

[0006] In one possible implementation, the floating wheel is detachably mounted on the brake arm, and the floating roller of the floating wheel is capable of reciprocating and extending relative to the brake arm in the direction toward or away from the traveling wheel.

[0007] In one possible implementation, the floating roller of the floating wheel extends outward a first preset distance relative to the friction plate on the brake arm in the direction of telescopic movement, and can retract to a position flush with the friction plate.

[0008] In one possible implementation, the floating wheel includes: a floating roller, a floating roller shaft, a spring, and a spring seat; The spring seat is detachably mounted on the brake arm; The floating roller shaft passes through the spring seat, and the floating roller shaft can move laterally back and forth along the axial direction of the traveling wheel; The floating roller is located at one end of the floating roller shaft, extends outward by a predetermined distance relative to the spring seat, and can continuously roll in contact with the tread of the walking wheel it is used on in the use state. The spring is disposed inside the spring seat, with one end abutting against the spring seat and the other end abutting against the floating roller shaft, and can provide support force in the axial direction of the floating roller shaft.

[0009] In one possible implementation, there are two brake arms, with the two floating wheels in each set of floating wheels symmetrically arranged on the two brake arms.

[0010] One possible implementation also includes: a limiting nut; The floating roller shaft has an external thread section at the end away from the floating roller. The limiting nut is threadedly connected to the external thread section of the floating roller shaft, and the spring seat is located between the limiting nut and the bushing. In the released state, the limiting nut and the spring seat fit together to form a limit mechanical stop structure for the axial displacement of the floating roller.

[0011] One possible implementation also includes: a fixing plate; The spring seat is disposed on the fixed plate, and the floating roller shaft passes through the mounting hole opened on the fixed plate; The fixing plate is detachably mounted on the brake arm by bolts and can be adjusted along the rotation direction of the traveling wheel.

[0012] In one possible implementation, the floating roller shaft has a cross-sectional diameter at one end of the floating roller that is larger than the cross-sectional diameter of the mounting hole.

[0013] In one possible implementation, the floating roller, the floating roller shaft, the spring, and the limiting nut are arranged coaxially.

[0014] The beneficial effects of the floating wheels and hydraulic wheel clamps in this application are as follows: Multiple sets of floating wheels on two sets of brake arms synchronously contact the traveling wheels, compensating for lateral wheel misalignment in real time and ensuring uniform force on the friction pads on the brake arms. Specifically, through symmetrically arranged floating wheels, regardless of whether the brake is applied or released, the floating rollers continuously roll and contact the wheels, limiting lateral wheel movement. By ensuring that the distance between the friction pads on both sides and the wheels is the same, uniform force is ensured on the friction pads on both sides, significantly reducing localized wear of the friction pads.

[0015] Other features and aspects of this application will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0016] The accompanying drawings, which are included in and form part of this specification, illustrate exemplary embodiments, features, and aspects of this application together with the specification and serve to explain the principles of this application.

[0017] Figure 1 This is a front view schematic diagram of the hydraulic clamping wheel device according to an embodiment of this application; Figure 2 This is a top view of the hydraulic clamping wheel device according to an embodiment of this application; Figure 3 This invention provides a schematic diagram of the main structure of a hydraulic clamping wheel device according to an embodiment of this application. Figure 4 This is a side view of the hydraulic clamping wheel device according to an embodiment of this application; Figure 5 A cross-sectional schematic diagram of a floating wheel according to an embodiment of this application is shown; Figure 6 A schematic diagram of the main structure of the floating wheel according to an embodiment of this application is shown; Figure 7 This document shows a cross-sectional schematic diagram of a hydraulic clamping wheel device according to an embodiment of this application; Figure 8 The diagram shows a bottom view of the hydraulic clamping wheel device according to an embodiment of this application. Detailed Implementation

[0018] Various exemplary embodiments, features, and aspects of this application will now be described in detail with reference to the accompanying drawings. The same reference numerals in the drawings denote elements that have the same or similar functions. Although various aspects of the embodiments are shown in the drawings, they are not necessarily drawn to scale unless specifically indicated otherwise.

[0019] It should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the present invention or simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0020] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0021] The term “exemplary” as used herein means “serving as an example, embodiment, or illustration.” Any embodiment illustrated herein as “exemplary” is not necessarily to be construed as superior to or better than other embodiments.

[0022] Furthermore, to better illustrate this application, numerous specific details are provided in the following detailed embodiments. Those skilled in the art should understand that this application can be implemented without certain specific details. In some instances, methods, means, components, and circuits well-known to those skilled in the art have not been described in detail in order to highlight the main points of this application.

[0023] Cranes, as large lifting and transportation equipment, are widely used in ports, factories, infrastructure projects, and other operational scenarios. To ensure the positional stability of the crane when it is parked and to prevent slippage caused by strong winds or ground slopes, the traveling mechanism must be equipped with a wheel clamping brake device to lock and brake the equipment by clamping the traveling wheels. This application uses floating wheels 11 on the wheel clamps to clamp the traveling wheels, ensuring that the distance between the friction plates on both sides and the traveling wheel in the middle is equal regardless of whether the brake is applied or released. This ensures that the friction plates on both sides wear equally and avoids excessive wear in certain areas, which could affect the parking safety of the crane.

[0024] like Figure 1 As shown, the wheel clamping device in this embodiment includes: a base 4, a hydraulic cylinder 3, a brake arm 6, and a floating wheel 11; The base 4 is designed to be mounted on a vehicle wheel that requires braking via a bracket; The hydraulic cylinder 3 is located inside the base 4, and its output end provides reciprocating extension and retraction output driving force. There are an even number of brake arms 6. Two brake arms 6 form a group of brake arms. The two brake arms 6 in each group are symmetrically arranged on the base 4. The rear end of the brake arm 6 is driven and connected to the output end of the hydraulic cylinder, and the front end is provided with a friction plate. The floating wheel 11 is a rotatable wheel, and the number is even. Every two floating wheels 11 form a floating wheel group. The two floating wheels 11 in a group are correspondingly set with the friction plates of a set of brake arms 6. When the wheel clamp is in use, the floating wheel 11 rolls and abuts against the sides of the traveling wheel to be braked.

[0025] In this specific embodiment, multiple floating wheels 11 on the two sets of brake arms 6 synchronously contact the traveling wheels to compensate for lateral wheel misalignment in real time, ensuring uniform force on the friction pads on the brake arms 6. Specifically, through the symmetrically arranged floating wheels 11, the floating wheels continuously roll and contact the wheels regardless of whether the brake is applied or released, limiting lateral wheel movement. By ensuring that the distance between the friction pads on both sides and the wheels is the same, uniform force is ensured on the friction pads on both sides, significantly reducing localized wear of the friction pads.

[0026] Specifically, the floating wheel 11 is mounted on the brake arm 6 and faces the same direction as the friction braking of the friction pads. The hydraulic cylinder 3 applies braking force to the traveling wheel located between the two brake arms 6. The floating wheels 11 of the two brake arms 6 roll and abut against the traveling wheel at the same time. Therefore, whether in the braking state or the brake release state, the distance between the two friction pads and the traveling wheel is always equal.

[0027] In one specific embodiment, each set of brake arms 6 is matched with two sets of floating wheel sets, which are respectively set at both ends of the friction plate in the length direction.

[0028] In this specific embodiment, each brake arm 6 is provided with at least one floating wheel 11, and the floating wheels 11 on the two brake arms 6 are symmetrically arranged. The two floating wheels 11 in a group roll and abut against each other on both sides of the same position facing the traveling wheel. Among them, the two floating wheels 11 on one brake arm 6 are symmetrically arranged with the friction plate as the center.

[0029] In one specific embodiment, the floating wheel 11 is detachably mounted on the brake arm 6, and the floating roller of the floating wheel 11 can reciprocate and extend relative to the brake arm 6 in the direction toward or away from the traveling wheel.

[0030] In this specific embodiment, both the floating wheel 11 and the friction plate are mounted on the brake arm 6. The floating roller of the floating wheel 11 can reciprocate and extend relative to the brake arm 6 in the direction toward the traveling wheel, and always roll and abut against the tread of the shaped wheel.

[0031] In one specific embodiment, the floating roller of the floating wheel 11 extends outward a first preset distance relative to the friction plate on the brake arm 6 in the direction of telescopic movement, and can retract to a position flush with the friction plate.

[0032] In this specific embodiment, under normal conditions, the floating roller protrudes outward by a first preset distance relative to the friction plate provided on the brake arm 6, that is, the end face of the floating roller extends beyond the working surface of the friction plate and protrudes outward by a certain distance. When the floating roller is subjected to external pressure, the roller retracts, and its end face can move to a position flush with the friction working surface of the friction plate.

[0033] In one specific embodiment, there are two brake arms 6, with two floating wheels 11 in each floating wheel group symmetrically arranged on the two brake arms 6.

[0034] In this specific embodiment, there are two brake arms 6 to clamp the middle traveling wheel, and the two floating wheels 11 in each group are symmetrically arranged on the two brake arms 6. When the brake arms 6 are relaxed, the springs built into the floating wheels 11 provide elastic force, and the two floating wheels 11 always provide pressure toward the traveling wheel. Since the spring force on the two floating wheels 11 is the same, it ensures that the pressure provided by the two floating wheels 11 toward the traveling wheel in the group is connected. At this time, the two floating wheels 11 in the group are symmetrically arranged on the brake arms 6.

[0035] In one specific embodiment, the floating wheel 11 includes: a floating roller, a floating roller shaft, a spring, and a spring seat; The spring seat is detachably mounted on the brake arm 6; The floating roller shaft passes through the spring seat, and the floating roller shaft can move laterally back and forth along the axial direction of the traveling wheel; The floating roller is located at one end of the floating roller shaft, extends outward by a predetermined distance relative to the spring seat, and can continuously roll in contact with the tread of the walking wheel it is used on in the use state. The spring is disposed inside the spring seat, with one end abutting against the spring seat and the other end abutting against the floating roller shaft, and can provide support force in the axial direction of the floating roller shaft.

[0036] In this specific embodiment, regardless of whether the brake is applied or released, the floating roller 120 continuously rolls and adheres to the wheel, restricting the lateral movement of the wheel, ensuring that the friction plates on both sides are subjected to uniform force, greatly reducing local wear of the friction plates, and relying on the elastic sliding structure of the spring 150 to solve the problem of one-sided adhesion of the friction plates in traditional wheel clamps.

[0037] Preferred, such as Figure 1As shown, it also includes: a bushing 140, which is disposed in the mounting hole. The floating roller shaft 130 is coaxially inserted in the bushing 140 and slides in cooperation with the bushing 140. The bushing 140 is a cylindrical sleeve structure with a smooth inner hole and an outer diameter that matches the hole diameter of the fixing plate 110. The bushing 140 is installed between the floating roller shaft 130 and the hole of the fixing plate 110 to ensure the smooth rotation of the floating roller shaft 130.

[0038] Preferably, the floating roller 120 has a cylindrical structure and is rotatably mounted on the front end of the floating roller shaft 130 facing the traveling wheel 7. The direction of rotation is tangent to the surface of the fixed plate 110, and it is in continuous contact with the tread of the crane traveling wheel 7 throughout the entire process.

[0039] In a specific embodiment, such as Figure 2 As shown, it also includes: a limit nut 170; the end of the floating roller shaft 130 away from the floating roller 120 is provided with an external thread section, the thread of the limit nut 170 is threadedly connected to the external thread section of the floating roller shaft 130, and moves rigidly synchronously with the floating roller shaft 130, and the spring seat 160 is located between the limit nut 170 and the bushing 140. In the state of brake release, the limit nut 170 and the spring seat 160 fit together to form a limit mechanical stop structure for the displacement of the floating roller shaft 130, limiting the maximum extension stroke of the roller.

[0040] In this specific embodiment, when the brake is released, the spring 150 releases preload to push the floating roller shaft 130 to extend toward the traveling wheel 7. The limiting nut 170 moves synchronously with the floating roller shaft 130. After the limiting thread contacts the spring seat 160, it locks the maximum sliding distance to prevent the roller shaft from extending too far and causing the roller to detach from the wheel tread. When the brake is applied, the wheel squeezes the roller to slide inward, and the limiting nut 170 separates from the spring seat 160. The spring 150 can then be compressed normally to absorb the offset.

[0041] Preferred, such as Figure 1 and Figure 2 As shown, the limiting nut 170 is bolted to the floating roller shaft 130 and can move back and forth with the floating roller shaft 130. By limiting the position of the limiting nut 170 on the floating roller shaft 130, the maximum sliding distance of the floating roller shaft 130 is limited.

[0042] In one specific embodiment, it further includes: a fixing plate 110, the spring seat 160 is disposed on the fixing plate 110, and the floating roller shaft 130 passes through the mounting hole opened on the fixing plate 110. The fixing plate 110 is detachably disposed on the brake arm 6 by bolts and can be adjusted along the rotation direction of the traveling wheel.

[0043] In one specific embodiment, the spring 150 is in a compressed state; the two ends of the spring 150 abut against the platform of the floating roller shaft and the end face of the spring seat 160, respectively.

[0044] In this specific embodiment, the two ends of the compressed spring 150 are always in contact with the inner sidewall of the spring seat 160 and the platform of the floating roller shaft 130, providing the floating roller shaft 130 with an elastic thrust that is always directed toward the direction of the traveling wheel 7.

[0045] Preferably, the inner diameter of the spring seat 160 is larger than the diameter of the floating roller shaft 130, and a platform protrudes circumferentially on the floating roller shaft 130 to support the spring 150. Specifically, the platform is located near the end of the floating roller shaft 130 where the external thread begins, adjacent to the end of the floating roller shaft 130 where the floating roller 120 is located. The two ends of the spring 150 continuously output elastic thrust by abutting against the inner sidewall of the spring seat 160 and the platform on the floating roller shaft 130, respectively, so that the floating roller 120 can be kept close to the wheel without wheel compression.

[0046] In a specific embodiment, such as Figure 1 As shown, the floating roller 120, floating roller shaft 130, bushing 140, spring 150 and limit nut 170 are coaxially arranged and all transmit force in a straight line along the axis, with no radial component. The floating roller shaft 130 only produces pure lateral sliding and will not deflect.

[0047] In one specific embodiment, the floating roller shaft 130 has a cross-sectional diameter at one end of the floating roller 120 that is larger than the cross-sectional diameter of the mounting hole. When the floating roller shaft 130 slides away from the fixed plate 110 to the limit position, it fits against the fixed plate 110, thus forming a travel limit for the roller shaft to slide inward.

[0048] According to the above embodiment, the fixed plate 110 serves as the fixed base, and the bushing 140 and the floating roller shaft 130 form a low-friction sliding pair. A pre-compression spring 150 provides continuous clamping force, which, combined with the inner limit of the front shoulder and the outer limit of the tail nut 170 of the floating roller shaft 130, forms a bidirectional stroke constraint. This achieves adaptive elastic compensation for the crane's traveling wheel 7 throughout the entire process, with continuous movement divided into two main working conditions: braking and brake release. After assembly, the spring 150 remains in a pre-compression state. One end of the spring 150 abuts against the platform of the floating roller shaft 130, while the other end presses against the spring seat 160, continuously pushing the floating roller shaft 130 to extend towards one side of the traveling wheel 7. This ensures that the floating roller 120 remains in rolling contact with the tread of the traveling wheel 7, eliminating the separation gap between the roller and the wheel, guaranteeing the compensation function is effective throughout the entire process. Furthermore, the floating roller 120, floating roller shaft 130, spring 150, and limit nut 170 are arranged coaxially.

[0049] Under the applied braking condition, the friction pads of the brake arm 6 of the wheel clamp clamp the traveling wheel 7. The wheel, subjected to clamping force, experiences a slight lateral shift, compressing the floating roller 120. This compressive force is transmitted through the floating roller 120 to the floating roller shaft 130, overcoming the preload of the spring 150 and pushing the floating roller shaft 130 to slide away from the traveling wheel 7, further compressing the spring 150. When the shift reaches its upper limit, the front shoulder of the floating roller shaft 130 abuts against the mounting hole end face of the fixing plate 110, forming an inward sliding mechanical limit to prevent the spring 150 from over-compressing and causing plastic failure. The reverse elastic force of the spring 150 continuously presses against the wheel, forcing the wheel to be centered, ensuring uniform force on both sides of the friction pads, and avoiding one-sided wear and jamming of the brake arm 6.

[0050] When the brake is released and the vehicle is in motion, the hydraulic cylinder 3 drives the brake arm 6 to open, the friction plate disengages from the travel wheel 7, the spring 150 releases its elastic potential energy to push the floating roller shaft 130 to slide toward the travel wheel 7, and the floating roller 120 continues to roll in contact with the wheel tread, adaptively offsetting the lateral deviation caused by the bounce of the travel wheel 7, until the limit nut 170 at the tail of the floating roller shaft 130 contacts the outer wall of the spring seat 160, forming an outward sliding limit stop, limiting the maximum extension of the roller, and preventing the roller from disengaging from the wheel tread.

[0051] In one specific embodiment, it further includes: a mounting bracket, the base 4 being adapted to be mounted on the crane traveling mechanism via the mounting bracket 10; a hydraulic cylinder 3 being disposed inside the base 4, the output end reciprocating and extending in the direction toward the traveling wheel 7 to output driving force; two brake arms 6 being a pair of lever structures symmetrically arranged, disposed on the base 4, with the rear end of the brake arms 6 being drivenly connected to the adjusting rod 9, and the front end being provided with a friction plate to clamp the traveling wheel 7; floating wheels 11 being symmetrically arranged on both sides of the wheel clamper, with two sets arranged on each side, and located in front of or behind the brake arms 6, and fixedly connected to the base 4 via a fixing plate 110.

[0052] In this specific embodiment, when the hydraulic cylinder 3 is depressurized, the internal disc spring 5 drives the cylinder output end to extend, pushing the rear end of the brake arm 6 to open. Under the action of leverage, the front friction plate clamps the wheel to achieve braking. After high-pressure oil is introduced into the hydraulic cylinder 3, the output end retracts, pulling the rear end of the brake arm 6 to close, and the friction plate opens to release the brake. Multiple floating wheels on the two sets of brake arms 6 synchronously contact the traveling wheel 7, compensating for the lateral displacement of the wheel in real time, and ensuring that the brake arm 6 and the friction plate are subjected to uniform force.

[0053] Preferably, the hydraulic cylinder 3 is built into the base 4, and the output shaft reciprocates in a horizontal direction toward the traveling wheel 7 to provide the driving force for releasing the brake and braking.

[0054] Preferred, such as Figure 5As shown, there are two brake arms 6, which are symmetrically arranged on both sides of the traveling wheel 7, forming a double-lever brake actuator. The two brake arms 6 can slide towards or relative to each other via the support shaft 12, clamping or releasing the traveling wheel 7.

[0055] Preferred, such as Figure 5 As shown, floating wheels are symmetrically arranged on the left and right sides of the wheel clamp, with two sets of floating wheels arranged side by side on each side; the floating wheels are fixed to the side wall of the base 4 by the fixing plate 110 and arranged on both sides of the traveling wheel 7, and the floating rollers 120 directly roll in contact with the tread surface of the traveling wheel 7.

[0056] In a specific embodiment, such as Figure 3 As shown, the hydraulic cylinder 3 includes: a hydraulic cylinder body, a piston 1 and a disc spring 5. The hydraulic cylinder is located inside the base 4. The disc spring 5 is sleeved on the hydraulic cylinder body, with one end abutting against the piston 1 and the other end abutting against the inner wall step of the base 4. The extension and retraction direction of the disc spring 5 is the same as the reciprocating motion direction of the piston 1.

[0057] In this specific embodiment, when the oil circuit is depressurized, the disc spring 5 elastically releases and extends outward, pushing the piston 1 to extend outward and driving the brake arm 6 to clamp the wheel; when hydraulic oil enters the hydraulic cylinder, the oil pressure overcomes the elastic force of the disc spring 5 and pushes the piston 1 to retract inward, the disc spring 5 is compressed and stores energy, and the brake arm 6 is released to achieve brake release.

[0058] Preferably, the base 4 is a hollow structure with at least one open end for extending the piston 1 to drive the brake arm 6, and the interior of the base 4 is used to house the hydraulic cylinder body, the piston 1 and the disc spring 5.

[0059] Preferably, piston 1 is fixedly connected to brake arm 6. By injecting or deleting oil, piston 1 can reciprocate, thereby driving brake arm 6 to release or brake.

[0060] Preferably, the disc spring 5 is disposed inside the base 4 and sleeved on the outside of the hydraulic cylinder body, with its two ends abutting against the inner wall of the base 4 and the piston 1 respectively. The disc spring 5 is always in a compressed state and has compressive elastic potential energy, and always provides the piston 1 with a force away from the walking wheel 7.

[0061] In a specific embodiment, such as Figure 3 , 4 As shown in Figures 5 and 6, the two brake arms 6 cooperate with the support shaft 12 to form a lever structure for braking the traveling wheel 7. Specifically, the brake arm 6 is sleeved on the support column, with one end having a friction plate as the front end and the other end as the rear end. The piston 1 is fixedly connected to the rear end of the brake arm 6, and the distance between the rear end of the brake arm 6 and the support shaft 12 is greater than the distance between the front end of the brake arm 6 and the support shaft 12, thus forming a lever structure. Through the lever principle, the traveling wheel 7 can be clamped with a larger force.

[0062] In this specific embodiment, the support shaft 12 serves as a fixed fulcrum and is rotatably positioned in the middle and rear part of the brake arm 6, dividing the brake arm 6 into two sections. The part between the fulcrum and the connection point of the piston 1 is the power arm, and the part between the fulcrum and the friction plate mounting end is the resistance arm. The length of the power arm is set to be greater than the length of the resistance arm. When applying the brake, the disc spring 5 in the hydraulic cylinder releases its elastic potential energy, pushing the piston 1 outward and pushing the rear end of the brake arm 6. Since the support shaft 12 is fixed, the entire brake arm 6, as a rigid component, cannot deform and can only swing around the support shaft 12. Affected by the lever motion characteristics, while the rear end opens outward, the front end retracts inward along a reverse arc, causing the friction plate to press against the traveling wheel 7. At this time, the original thrust of the disc spring 5 acting on the piston 1 is amplified by the lever ratio, generating a clamping force at the front end of the brake arm 6 that is several times the force of the disc spring 5. When the brake is released, the operation reverses. Hydraulic oil pushes piston 1 to compress disc spring 5, causing it to retract inward. This pulls the rear end of brake arm 6 to swing inward, while the entire brake arm 6 continues to rotate around support shaft 12. Simultaneously, the front end opens outward and detaches from the wheel. Following the same lever torque transmission logic, a small hydraulic thrust overcomes the preload of disc spring 5 to complete the brake release. Throughout the process, brake arm 6 maintains a rigid form, transmitting and amplifying force only through its overall swing around an offset fulcrum. This, combined with the subsequent automatic compensation mechanism, offsets the stroke changes caused by friction pad wear.

[0063] In a specific embodiment, such as Figure 6 As shown, it also includes: an equal-distance spring 13; the two ends of the equal-distance spring 13 are respectively connected to the inner sides of the two brake arms 6; the equal-distance spring is in a compressed state, constraining the synchronous opening and closing of the two brake arms 6.

[0064] In this specific embodiment, during the braking operation: the disc spring 5 pushes the piston 1 outward, opening the rear ends of the two brake arms 6 to expand outward, while the front ends of the brake arms 6 clamp the wheel inward. During the opening of the two brake arms 6, the equal-distance spring 13 is stretched. The equal-distance spring 13 pulls the left and right brake arms 6 evenly with its reverse force, forcing the opening amplitude of the two brake arms 6 to be completely consistent, ensuring that the left and right friction pads synchronously adhere to the two end faces of the wheel. During the brake release operation: the high-pressure oil drives the piston 1 to retract, the rear ends of the brake arms 6 move closer together, the front friction pads loosen outward, and the equal-distance spring 13 rebounds to release the compression. Relying on the elastic force of the equal-distance spring 13, the two brake arms 6 are synchronously pulled backward, causing the left and right friction pads to synchronously detach from the wheel, ensuring that the brake release gap value on both sides is equal, and avoiding the problem of one-sided friction pad adhering to the wheel or one-sided gap being too large.

[0065] In a specific embodiment, such as Figure 3 and Figure 4As shown, it also includes: end cap 8; the base 4 is a hollow shell structure with an opening on the outside along the reciprocating motion direction of the piston 1, and the end cap 8 is detachably connected to the opening of the base 4 to limit the maximum outward stroke of the piston 1.

[0066] In a specific embodiment, such as Figure 3 As shown, it also includes: an oil seal 2, an oil hole connected to a hydraulic pump is provided on the base 4, the oil hole is connected to the moving space of the piston 1, the piston 1 is provided with an annular mounting groove in the circumferential direction, the oil seal 2 is embedded in the mounting groove, the outer wall of the oil seal 2 is in contact with the inner wall of the base 4, and the inner wall is in contact with the outer periphery of the piston 1.

[0067] In a specific embodiment, such as Figure 6 As shown, it also includes: a rubber dust cover 14, which covers the extended section of the floating roller shaft 130.

[0068] The various embodiments of this application have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A wheel clamp, characterized in that, include: The base, hydraulic cylinder, brake arm, and floating wheel; The substrate is designed to be mounted on a vehicle wheel that requires braking via a support frame. The hydraulic cylinder is located inside the base, and its output end provides a reciprocating extension and retraction output driving force. There are an even number of brake arms, and two brake arms form a group of brake arms. The two brake arms in each group are symmetrically arranged on the base, and the rear end of the brake arm is driven to the output end of the hydraulic cylinder, and the front end is provided with a friction plate. The floating wheels are rotatable wheels, and the number of them is even. Every two floating wheels form a group of floating wheels. The two floating wheels in a group are correspondingly arranged with the friction plates of a group of brake arms. When the wheel clamp is in use, the floating wheels roll and abut against the sides of the traveling wheel to be braked.

2. The wheel clamp according to claim 1, characterized in that, Each brake arm is equipped with two sets of floating wheel sets, which are respectively located at both ends of the friction plate along its length.

3. The wheel clamp according to claim 1, characterized in that, The floating wheel is detachably mounted on the brake arm, and the floating roller of the floating wheel can reciprocate and extend relative to the brake arm in the direction toward or away from the traveling wheel.

4. The wheel clamp according to claim 3, characterized in that, The floating roller of the floating wheel extends outward a first preset distance relative to the friction plate on the brake arm in the direction of telescopic movement, and can retract to a position flush with the friction plate.

5. The wheel clamp according to claim 1, characterized in that, The floating wheel includes: a floating roller, a floating roller shaft, a spring, and a spring seat; The spring seat is detachably mounted on the brake arm; The floating roller shaft passes through the spring seat, and the floating roller shaft can move laterally back and forth along the axial direction of the traveling wheel; The floating roller is located at one end of the floating roller shaft, extends outward by a predetermined distance relative to the spring seat, and can continuously roll in contact with the tread of the walking wheel it is used on in the use state. The spring is disposed inside the spring seat, with one end abutting against the spring seat and the other end abutting against the floating roller shaft, and can provide support force in the axial direction of the floating roller shaft.

6. The wheel clamp according to claim 2, characterized in that, The number of brake arms is two, and the two floating wheels in each floating wheel group are symmetrically arranged on the two brake arms.

7. The wheel clamp according to claim 5, characterized in that, Also includes: Limit nut; The floating roller shaft has an external thread section at the end away from the floating roller. The limiting nut is threadedly connected to the external thread section of the floating roller shaft, and the spring seat is located between the limiting nut and the bushing. In the released state, the limiting nut and the spring seat fit together to form a limit mechanical stop structure for the axial displacement of the floating roller.

8. The wheel clamp according to claim 5, characterized in that, Also includes: Fixing plate; The spring seat is disposed on the fixed plate, and the floating roller shaft passes through the mounting hole opened on the fixed plate; The fixing plate is detachably mounted on the brake arm by bolts and can be adjusted along the rotation direction of the traveling wheel.

9. The wheel clamp according to claim 8, characterized in that, The diameter of the cross-section at one end of the floating roller shaft is larger than the diameter of the cross-section of the mounting hole.

10. The wheel clamp according to claim 7, characterized in that, The floating roller, the floating roller shaft, the spring, and the limiting nut are arranged coaxially.

Images