A distance-adjustable rod for crane examination

Abstract

The utility model provides a distance adjustable staff for crane examination, including staff and base, the base includes middle base, first base and second base, and the staff is equipped with in middle base top, first base top and second base top, is equipped with the slide and screw on middle base, the slide is fixedly connected with middle base, and the screw is rotatably connected with middle base, and the both ends of slide and screw all extend to the direction away from middle base, and the both ends of slide are connected with first base and second base slidingly respectively, and the both ends of screw are connected with first base and second base threadedly respectively, and the thread rotation direction of both ends of screw is opposite, and the first bevel gear is equipped with in the screw middle, and the first bevel gear has the second bevel gear, and the second bevel gear is connected with the adjusting lever, and the one end of adjusting lever away from second bevel gear is located in the base outside. The utility model uses flexibly, can adjust the staff distance according to different examination needs, and reduces the examination site arrangement cost.

Description

Technical Field

[0001] This utility model relates to the technical field of equipment for crane examinations, specifically to an adjustable spacing benchmark for crane assessments. Background Technology

[0002] Crane examinations aim to ensure that crane operators possess the skills to operate cranes safely and in accordance with regulations through systematic assessment, thereby reducing operational risks and protecting the lives and property of personnel and the normal operation of equipment. The crane examination includes a bucket-and-pole winding test. During the test, the operator must lift a bucket and complete the winding operation. Assessors evaluate the operator's operational ability based on whether the bucket collides with the pole during the winding process and the angle of tilt of the pole after the collision.

[0003] Different types of cranes (such as bridge cranes, gantry cranes, and truck cranes) have varying requirements for marker spacing during examinations due to differences in boom length, slewing radius, and operating precision. Smaller cranes require smaller marker spacing, while larger cranes require larger spacing. Furthermore, different site conditions or different operating standards also necessitate different marker spacing requirements during examinations. However, most existing marker spacing is fixed and non-adjustable, requiring the selection of different markers based on different examination requirements, which is costly and inconvenient. Therefore, to improve the flexibility of marker use and reduce the cost of setting up the examination site, an adjustable marker spacing is needed for crane assessments. Utility Model Content

[0004] To address the problems in the background art, this utility model proposes an adjustable spacing marker for crane assessment, comprising a marker and a base. The base includes a middle base, a first base, and a second base. The marker is respectively positioned on the top of the middle base, the first base, and the second base. The middle base has a sliding rod and a screw arranged along the width direction of the base. The sliding rod is fixedly connected to the middle base, and the screw is rotatably connected to the middle base. The axial directions of the sliding rod and the screw are the same as the length direction of the base. Both ends of the sliding rod and the screw extend away from the middle base. The two ends of the sliding rod are slidably connected to the first base and the second base, respectively. The two ends of the screw are threadedly connected to the first base and the second base, respectively. The threads at the two ends of the screw have opposite directions of rotation. A first bevel gear is positioned in the middle of the screw. The first bevel gear meshes with a second bevel gear. The second bevel gear is connected to an adjusting rod, with the end of the adjusting rod away from the second bevel gear located on the side outside the base. Preferably, slide rails are fixed on both sides of the middle base, and the two slide rails are symmetrically distributed along the width direction of the base. The length direction of the slide rails is the same as the length direction of the base. Slide grooves are provided on the opposite sides of the two slide rails. Slider blocks are fixed on both sides of the first base near the middle base and on both sides of the second base near the middle base. The sliders are slidably disposed in their respective slide grooves.

[0005] Preferably, the slide rail is provided with limiting plates at both ends for closing the slide groove, and the limiting plates are connected to the slide rail by bolts.

[0006] Preferably, each of the slide rails has a scale line at its top end, and the top of the first base near the middle base and the top of the second base near the middle base have scale indicator lines.

[0007] Preferably, the four corners of the middle base are fixed with support legs, and the bottom two corners of the first base away from the middle base and the bottom two corners of the second base away from the middle base are respectively provided with movable wheels, and the bottom cut surface of the movable wheels is on the same plane as the support legs on the ground.

[0008] Preferably, the axis of the movable wheel is in the same direction as the width of the base.

[0009] Preferably, a drive motor is fixed on one side of the intermediate base, and the output end of the drive motor is connected to the end of the adjusting rod away from the second bevel gear.

[0010] Preferably, an adjustment handle is fixedly connected to the end of the adjustment rod away from the second bevel gear.

[0011] The beneficial effects of this utility model are as follows: This invention comprises a central base, a first base, and a second base, each with a marker rod. The positions of the first and second bases relative to the central base are adjustable. By adjusting the distance between the first and second bases and the central base, the distance between the marker rods can be adjusted. This invention is flexible in use, allowing for adjustment of the marker rod distance to meet different assessment needs. It eliminates the need to design specific marker rod distances for each type of exam, thus reducing the cost of setting up the assessment venue. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram showing the connection relationship between the screw and the adjusting rod of this utility model.

[0013] The following are the labels in the diagram: 1. Marker; 2. Middle base; 3. First base; 4. Second base; 5. Slide rail; 6. Screw; 7. Slide rod; 8. Adjusting handle; 9. Support leg; 10. Moving wheel; 11. Scale line; 12. Scale indicator line; 13. Adjusting rod; 14. Second bevel gear; 15. First bevel gear; 16. Slide groove. Detailed Implementation

[0014] To make this utility model clearer and more understandable, the technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the given embodiments are only one of the implementation methods and do not represent all embodiments.

[0015] In this article, terms such as "above" and "below" are established based on the positional relationship shown in the attached drawings. Depending on the attached drawings, the corresponding positional relationship may also change. Therefore, they should not be interpreted as an absolute limitation on the scope of protection.

[0016] Combined with appendix Figure 1 -Appendix Figure 2 An adjustable-spacing benchmark for crane assessment includes a benchmark 1 and a base. The base includes an intermediate base 2, a first base 3, and a second base 4. The benchmark 1 is respectively positioned on the top of the intermediate base 2, the first base 3, and the second base 4. The intermediate base 2 is provided with a sliding rod 7 and a screw 6 arranged along the width direction of the base. The sliding rod 7 is fixedly connected to the intermediate base 2, and the screw 6 is rotatably connected to the intermediate base 2. The axial directions of the sliding rod 7 and the screw 6 are the same as the length direction of the base. Both ends of the sliding rod 7 and the screw 6 extend away from the intermediate base 2. The two ends of the sliding rod 7 are slidably connected to the first base 3 and the second base 4, respectively. The two ends of the screw 6 are threadedly connected to the first base 3 and the second base 4, respectively. The threads at the two ends of the screw 6 have opposite directions of rotation. A first bevel gear 15 is provided in the middle of the screw 6. The first bevel gear 15 is meshed with a second bevel gear 14. The second bevel gear 14 is connected to an adjusting rod 13. The end of the adjusting rod 13 away from the second bevel gear 14 is located on the side outside the base. Specifically, the screw 6 passes through the intermediate base 2, and the screw 6 is rotatably connected to the intermediate base 2 through a bearing. The intermediate base 2 is provided with a chamber for accommodating two bevel gears.

[0017] When the spacing of the marker rods 1 needs to be adjusted, the adjusting rod 13 is rotated. The adjusting rod 13 drives the screw 6 to rotate through the transmission of the second bevel gear 14 and the first bevel gear 15. In turn, the screw 6 drives the first base 3 and the second base 4, which are threadedly connected to the screw 6, to move. By rotating the adjusting rod 13 forward or backward, the first base 3 and the second base 4 are adjusted to move closer to or further apart from each other.

[0018] Specifically, slide rails 5 are fixed on both sides of the middle base 2. The two slide rails 5 are symmetrically distributed along the width direction of the base. The length direction of the slide rails 5 is the same as the length direction of the base. Slide grooves 16 are provided on the opposite sides of the two slide rails 5. Slider blocks are fixed on both sides of the first base 3 near the middle base 2 and on both sides of the second base 4 near the middle base 2. The sliders are slidably disposed in their respective slide grooves 16.

[0019] More specifically, the slide rail 5 is provided with limiting plates at both ends for closing the slide groove 16, and the limiting plates are connected to the slide rail 5 by bolts.

[0020] The slide rail 5 further restricts the movement path of the first base 3 and the second base 4, improving the stability of their movement. The limiting plate prevents the first base 3 and the second base 4 from disengaging from the slide rail 5.

[0021] Specifically, each of the slide rails 5 has a scale line 11 at its top end, and the top of the first base 3 near the middle base 2 and the top of the second base 4 near the middle base 2 are respectively provided with a scale indicator line 12. Based on the position of the scale line 11 indicated by the scale indicator line 12, the distance the first base 3 and the second base 4 move is determined, thereby determining the spacing of the marker 1 and improving the accuracy of the spacing adjustment of the marker 1.

[0022] Specifically, the four corners of the intermediate base 2 are fixed with support legs 9, and the bottom two corners of the first base 3 away from the intermediate base 2 and the bottom two corners of the second base 4 away from the intermediate base 2 are respectively provided with casters 10. The bottom cut surface of the casters 10 is on the same plane as the ground of the support legs 9. The bases are supported by the support legs 9 and the casters 10, and the casters 10 facilitate the movement of the first base 3 and the second base 4, thereby facilitating adjustment.

[0023] More specifically, the axis of the movable wheel 10 is in the same direction as the width of the base, so that the movable wheel 10 can only move along the length of the base, thereby improving the smoothness of movement of the first base 3 and the second base 4.

[0024] Specifically, a drive motor is fixed to one side of the intermediate base 2, and the output end of the drive motor is connected to the end of the adjusting rod 13 away from the second bevel gear 14. Alternatively, an adjusting handle 8 is fixedly connected to the end of the adjusting rod 13 away from the second bevel gear 14. The adjusting rod 13 can be rotated manually by turning the adjusting handle 8, or the adjusting rod 13 can be driven to rotate by the drive motor. When using a drive motor, a power supply (such as a battery) and a switch to control the start and stop of the drive motor are also required. Setting up a power supply and a switch to control the operation of the drive motor is a conventional technical means and will not be described in detail here.

[0025] Although embodiments of the present invention have been shown and described, those skilled in the art will be able to make various changes, modifications, substitutions and alterations to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An adjustable-spacing marker for crane assessment, comprising a marker (1) and a base, characterized in that: The base includes a middle base (2), a first base (3), and a second base (4). The middle base (2), the first base (3), and the second base (4) are each provided with a marker (1) on their tops. The middle base (2) is provided with a sliding rod (7) and a screw (6) arranged along the width direction of the base. The sliding rod (7) is fixedly connected to the middle base (2), and the screw (6) is rotatably connected to the middle base (2). The axial direction of the sliding rod (7) and the screw (6) is the same as the length direction of the base. Both ends of the sliding rod (7) and the screw (6) are directed away from the middle. The base (2) extends in the direction of the sliding rod (7), and the two ends of the sliding rod (7) are slidably connected to the first base (3) and the second base (4) respectively. The two ends of the screw (6) are threadedly connected to the first base (3) and the second base (4) respectively. The threads at the two ends of the screw (6) are opposite in direction. A first bevel gear (15) is provided in the middle of the screw (6). The first bevel gear (15) is meshed with a second bevel gear (14). The second bevel gear (14) is connected to an adjusting rod (13). The end of the adjusting rod (13) away from the second bevel gear (14) is located on the side outside the base.

2. The adjustable-spacing benchmark for crane assessment according to claim 1, characterized in that: The middle base (2) is fixed with slide rails (5) on both sides. The two slide rails (5) are symmetrically distributed along the width direction of the base. The length direction of the slide rails (5) is the same as the length direction of the base. The opposite sides of the two slide rails (5) are provided with slide grooves (16). The first base (3) is fixed with sliders on both sides near the middle base (2) and the second base (4) is fixed with sliders on both sides near the middle base (2). The sliders are slidably disposed in their respective slide grooves (16).

3. The adjustable-spacing benchmark for crane assessment according to claim 2, characterized in that: The slide rail (5) has limiting plates at both ends for closing the slide groove (16), and the limiting plates are connected to the slide rail (5) by bolts.

4. The adjustable-spacing benchmark for crane assessment according to claim 2, characterized in that: Each of the slide rails (5) has a scale line (11) on the top of each end, and the top of the first base (3) near the middle base (2) and the top of the second base (4) near the middle base (2) have scale indicator lines (12).

5. The adjustable-spacing benchmark for crane assessment according to claim 1, characterized in that: The four corners of the middle base (2) are fixed with support legs (9). The bottom two corners of the first base (3) away from the middle base (2) and the bottom two corners of the second base (4) away from the middle base (2) are respectively provided with moving wheels (10). The bottom cut surface of the moving wheels (10) is on the same plane as the ground of the support legs (9).

6. The adjustable-spacing benchmark for crane assessment according to claim 5, characterized in that: The axis of the movable wheel (10) is in the same direction as the width of the base.

7. The adjustable-spacing benchmark for crane assessment according to claim 1, characterized in that: A drive motor is fixed on one side of the intermediate base (2), and the output end of the drive motor is connected to the end of the adjusting rod (13) away from the second bevel gear (14).

8. The adjustable-spacing benchmark for crane assessment according to claim 1, characterized in that: An adjustment handle (8) is fixedly connected to the end of the adjusting rod (13) away from the second bevel gear (14).

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