Bekman beam handling tooling

Abstract

The utility model provides a kind of Beckman beam operating tool, including base and Beckman beam lifting assembly, the base is equipped with trundle, base is equipped with the first linear guide rail along horizontal direction, the Beckman beam lifting assembly includes substrate, substrate is fixedly connected with the slider of first linear guide rail, the substrate is equipped with the second linear guide rail along vertical direction, Beckman beam hook is equipped on the slider of second linear guide rail, the side of base is equipped with control handle, control handle is driven the slider of second linear guide rail lifting by pull wire.The utility model has the beneficial effects that due to the above-mentioned technical scheme, the action that Beckman beam measuring head is inserted into the loading car rear wheel gap can be conveniently completed, the labor intensity of operator is reduced, and the occurrence of injury is reduced.

Description

Technical Field

[0001] This utility model relates to the field of highway engineering testing technology, specifically a working tool for a Beckman beam. Background Technology

[0002] The Benkelman beam method is a suitable method for determining the elastic deflection of a pavement under static or very slow loading conditions, and it can effectively reflect the overall strength of the pavement. The Benkelman beam method for testing the rebound deflection of roadbeds and pavements is conducted in accordance with the Benkelman beam method for testing the rebound deflection of roadbeds and pavements in section T 0951-2008 of the "Specifications for Field Testing of Highway Subgrades and Pavements" (JTG 3450—2019).

[0003] In the Beckman beam method for testing the rebound deflection of roadbed and pavement, one step involves inserting the Beckman beam into the wheel gap of the rear wheel of a loading vehicle (a single-axle, dual-wheel vehicle), aligned with the vehicle's direction of travel. The beam arm must not contact the tires, and the Beckman beam probe is positioned at a measuring point 30-50 mm in front of the center of the wheel gap. Table T0951-1 of the "Specifications for Field Testing of Highway Subgrade and Pavement" specifies requirements for key parameters of the loading vehicle, including the standard axle load on the rear axle, single-sided dual-wheel load, tire pressure, and the equivalent circular area of ​​the single-wheel pressure transmission surface. For commonly used loading vehicles meeting these requirements, the height of the bottom of the truck bed at the rear wheel position from the ground is approximately 1 meter, and the distance from the rear wheel to the rear of the truck bed is approximately 1-1.5 meters. During the process of inserting the Beckman beam into the wheel gap of the loading vehicle, two operators, one in front and one behind, need to lift the 3.6m or 5.4m Beckman beam. The operator in front crawls under the vehicle down to the tire and places the probe of the Beckman beam 30-50mm in front of the center of the wheel gap. During this process, the operator in front needs to move forward in a crouching manner, which is very physically demanding. In addition, when the operator is working under the vehicle or exiting from under the vehicle, if they are not careful, their head or shoulder can easily hit the bottom of the vehicle, causing injury. Utility Model Content

[0004] The purpose of this invention is to provide an operating fixture for a Beckman beam, which can easily insert the probe of the Beckman beam into the wheel clearance of the rear wheel of the loading vehicle, reducing the difficulty of operation and the risk of injury to the operator.

[0005] The technical solution of this utility model is:

[0006] A Beckman beam operating fixture includes a base and a Beckman beam lifting assembly. The base is provided with casters and a first linear guide rail in the horizontal direction. The Beckman beam lifting assembly includes a base plate, which is fixedly connected to the slider of the first linear guide rail. A second linear guide rail in the vertical direction is provided on the base plate, and a Beckman beam hook is provided on the slider of the second linear guide rail. A control handle is provided on one side of the base, and the control handle drives the slider of the second linear guide rail to rise and fall via a pull cable.

[0007] The outer side of the rear wheel of the loading vehicle is basically flush with the side of the loading vehicle's cargo bed. The base with casters allows the operator to move the base from one side of the loading vehicle, so that the base can move in the axial direction of the rear wheel of the loading vehicle. This allows the Beckman beam hook on the Beckman beam lifting assembly to align with the rear wheel clearance of the loading vehicle, making the first straight track parallel to the symmetry plane of the two tires on one side of the loading vehicle's rear wheel. This creates conditions for the subsequent Beckman beam operating fixture to insert the Beckman beam into the rear wheel clearance of the loading vehicle.

[0008] The main body of the Beckman beam is an I-beam-like structure with an array of weight-reducing square holes on its beam arms. Two Beckman beam hooks are positioned along the first linear track. The hooks pass through the weight-reducing square holes from one side of the Beckman beam, positioning themselves within them. Then, under the control of the handle and the second linear guide, the hooks move upwards, hooking the Beckman beam and lifting its probe end, causing the probe's support leg to leave the ground. At the end of the Beckman beam furthest from the probe, the operator pushes the beam along the first linear track until the probe reaches the designated position within the wheel clearance of the loading vehicle's rear wheel.

[0009] The casters of this invention can be set as omnidirectional wheels. Although the movement of the omnidirectional wheels can enable the Beckman beam to enter the rear wheel gap of the loading vehicle, the rear wheel gap of the loading vehicle is very narrow, only slightly wider than the width of the Beckman beam. The omnidirectional wheels also have a certain turning radius. Therefore, the casters of the base mainly play a role in the process of the base extending into the bottom of the truck bed. For the process of the Beckman beam inserting into the rear wheel gap, the first linear guide rail is used for directional control.

[0010] Specifically, the second linear guide includes two sliding columns, with a top beam at the top of each column. The top beam and the sliding columns form a U-shaped structure. The slider is fitted onto the two sliding columns, and the outer sleeve of the pull cable is located on the top beam. The fiber core of the pull cable is fixed to the slider. The gripping and releasing action at the control handle can be converted into the rising and falling action of the slider. When the slider rises, the probe end of the Beckman beam is raised, and the probe end support leg is lifted off the ground. When the slider falls, the probe end support leg is lowered to the ground.

[0011] A positioning mechanism is provided on one side of the base. The positioning mechanism includes a positioning rod and a positioning rod support frame extending out of the base. The positioning rod support frame is provided with a linear array of positioning pin holes, and the positioning rod and the positioning rod support frame are pin-connected.

[0012] During the process of aligning the rear wheel clearance with the moving base, the operator, positioned to the side of the loading vehicle, cannot see the area between the two tires on one side of the loading vehicle's rear wheel, making the alignment process challenging. To assist in this process, this invention incorporates a positioning mechanism. When the base extends into the underside of the loading vehicle, the positioning rod is positioned so that when it touches the side wall of the loading vehicle's rear wheel, the Beckman beam lifting assembly precisely aligns with the rear wheel clearance. The positioning rod is adjustable because different loading vehicles have varying tire sizes and other characteristics; therefore, the positioning rod is adjustable, and the array direction of the positioning pin holes is perpendicular to the direction of the first linear guide rail.

[0013] The base has a handle on one side, and the control grip is set on the handle.

[0014] The height of the support legs of the Beckman beam is about 10-20cm. It is obviously physically demanding for the operator to move the base in a squatting position. Therefore, this utility model provides a handle on one side of the base, with the upper end of the handle about 80cm from the ground, so that the operator can move the base in a standing position, thus improving the convenience of operation.

[0015] The Beckman beam hook has a U-shaped structure. One side of the hook arm is fixedly connected to the slider of the second linear guide, and the end of the other side of the hook arm is turned outward.

[0016] The outward-curving hook arm ends facilitate the Beckman beam hook's engagement with the Beckman beam during upward movement. Preferably, the distance between the two hook arms of the Beckman beam hook matches the beam arm thickness at the weight reduction hole of the Beckman beam.

[0017] The base has a rectangular frame structure, with one side of the base perpendicular to the first linear guide rail.

[0018] Due to the need for the base plate, the first linear guide rail, and other structures, the base is designed as a frame structure. When the operator pushes the Beckman beam into the rear wheel clearance from the end furthest from the probe, the base is not locked due to the presence of casters. During the locking process, the locking casters can cause slight displacement of the base, resulting in inaccurate alignment of the Beckman beam hook. This invention addresses this by aligning one side of the base perpendicular to the first linear guide rail. When the Beckman beam is pushed, this side abuts against the rear wheel of the loading vehicle, thus achieving stable forward movement of the Beckman beam along the first linear guide rail.

[0019] This invention can ensure that the Beckman beam reaches 30-50mm in front of the center of the rear wheel clearance by setting the length of the first linear track or setting a limiting mechanism on the first linear track.

[0020] The advantages and positive effects of this utility model are: by adopting the above technical solution, the action of inserting the Beckman beam probe into the wheel gap of the loading vehicle can be completed conveniently, reducing the labor intensity of the operator and reducing the occurrence of injuries. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structural principle of this utility model.

[0022] Figure 2 This is a schematic diagram of the Beckman beam being inserted into the wheel clearance of the loading vehicle's rear wheel.

[0023] In the picture:

[0024] 1. Base; 2. First linear guide rail; 3. Base plate

[0025] 4. Second linear guide rail; 5. Beckman beam hook; 6. Handle

[0026] 7. Control handle 8. Pull cable 9. Positioning rod

[0027] 10. Positioning rod support frame; 11. Rear wheel of loading vehicle; 12. Beckman beam. Detailed Implementation

[0028] like Figure 1 , 2 As shown, this utility model:

[0029] A Beckman beam operating fixture includes a base 1 and a Beckman beam lifting assembly. The base is provided with casters and a first linear guide rail 2 along the horizontal direction. The Beckman beam lifting assembly includes a base plate 3, which is fixedly connected to the slider of the first linear guide rail 2. A second linear guide rail 4 along the vertical direction is provided on the base plate. A Beckman beam hook 5 is provided on the slider of the second linear guide rail 4. A control handle 7 is provided on one side of the base 1. The control handle 7 drives the slider of the second linear guide rail 4 to rise and fall through a pull cable 8.

[0030] A positioning mechanism is provided on one side of the base. The positioning mechanism includes a positioning rod 9 and a positioning rod support frame 10 extending out of the base. The positioning rod support frame is provided with a linear array of positioning pin holes, and the positioning rod and the positioning rod support frame are pin-connected.

[0031] The base has a handle 6 on one side, and a control grip 7 is mounted on the handle 6.

[0032] The Beckman beam hook 5 has a U-shaped structure. One side of the hook arm of the Beckman beam hook 5 is fixedly connected to the slider of the second linear guide, and the end of the other side of the hook arm is turned outward.

[0033] The base 1 has a rectangular frame structure, and one side of the base is perpendicular to the first linear guide rail 2.

[0034] The working process of this example:

[0035] Before use, first connect the positioning rod 9 to the positioning rod support frame 10. By adjusting the correspondence between the pin hole on the positioning rod 9 and the pin hole on the positioning rod support frame 10, the Beckman beam hook 5 will be exactly aligned with the wheel clearance of the rear wheel of the loading vehicle when the positioning rod touches the side wall of the rear wheel 11 of the loading vehicle.

[0036] When it is necessary to move the Beckman beam 12 and insert its probe into the wheel clearance of the rear wheel 11 of the loading vehicle, two operators are required, one in front and one behind. The operator in front moves the Beckman beam operating fixture by using handle 6, so that the two Beckman beam hooks 5 extend into the two weight-reducing square holes at the probe end of the Beckman beam. Then, the operator grips the control handle 7 and lifts the probe end of the Beckman beam 12, so that the outrigger at the probe end is off the ground. The operator in front holds the control handle 7 and pushes the handle to push the Beckman beam operating fixture behind the rear wheel of the vehicle, so that the positioning rod 9 touches the sidewall of the rear wheel 11 of the loading vehicle, and the front edge of the base abuts against the rear wheel of the loading vehicle, fixing the position. The operator behind lifts the end of the Beckman beam away from the probe, coordinating with the actions of the operator in front, and corrects the positional relationship between the Beckman beam and the wheel clearance of the rear wheel of the loading vehicle. After the front operator fixes the position, the rear operator pushes the probe of the Beckman beam along the first linear guide rail 2 to a position 30-50mm in front of the center of the rear wheel clearance. The front operator releases the control handle 7, the outrigger at the probe end of the Beckman beam lands, the Beckman beam operating fixture exits from under the vehicle, and the rear operator lowers the Beckman beam, completing the operation.

[0037] The above description provides a detailed account of one embodiment of the present invention. However, this description is merely a preferred embodiment and should not be construed as limiting the scope of the present invention. All equivalent variations and improvements made within the scope of the claims of the present invention should still fall within the patent coverage of the present invention.

Claims

1. A Benkelman beam operating fixture, characterized in that: The device includes a base and a Beckman beam lifting assembly. The base has casters and a first linear guide rail in the horizontal direction. The Beckman beam lifting assembly includes a base plate, which is fixedly connected to the slider of the first linear guide rail. The base plate has a second linear guide rail in the vertical direction, and the slider of the second linear guide rail has a Beckman beam hook. A control handle is provided on one side of the base, and the control handle drives the slider of the second linear guide rail to rise and fall via a pull cable.

2. The operating fixture for the Beckman beam according to claim 1, characterized in that: A positioning mechanism is provided on one side of the base. The positioning mechanism includes a positioning rod and a positioning rod support frame extending out of the base. The positioning rod support frame is provided with a linear array of positioning pin holes, and the positioning rod and the positioning rod support frame are pin-connected.

3. The operating fixture for the Beckman beam according to claim 1, characterized in that: The base has a handle on one side, and the control grip is set on the handle.

4. The operating fixture for the Beckman beam according to claim 1, characterized in that: The Beckman beam hook has a U-shaped structure. One side of the hook arm is fixedly connected to the slider of the second linear guide, and the end of the other side of the hook arm is turned outward.

5. The operating fixture for the Beckman beam according to claim 1, characterized in that: The base has a rectangular frame structure, with one side of the base perpendicular to the first linear guide rail.

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