A kind of auxiliary chassis for forklift protective roof frame strength test

Abstract

The utility model relates to a fork truck technical field, concretely relates to a kind of auxiliary chassis for fork truck protective roof frame strength test, it includes the left and right guide rails that is arranged in the front-back direction along protective roof frame parallelly, the distance between left and right guide rails is not less than the left and right width of protective roof frame;And fixed base and moving base are connected with left and right guide rails respectively, moving base moves along the length direction of left and right guide rails, to change the distance between moving base and fixed base.The utility model changes the distance between moving base and fixed base by setting moving base, the moving track of moving base is constrained by setting left and right guide rails, so that the protective roof frame of different bottom width can be fixedly connected with moving base and fixed base, to carry out strength test, and then the same auxiliary chassis can adapt to a variety of width protective roof frame, reduce test cost.

Description

Technical Field

[0001] This utility model relates to the field of forklift technology, specifically to an auxiliary chassis for strength testing of forklift overhead guards. Background Technology

[0002] Forklifts are classified as special equipment, and the structural strength of their overhead guards needs to be verified through dynamic load tests and impact drop tests. The dynamic load test verifies the overhead guard's ability to resist permanent deformation when goods fall, ensuring that the driver's head space is not intruded. The deformation amount is required to be ≤20mm to prevent falling objects from directly impacting the driver. The impact drop test simulates the impact of long, strip-shaped falling objects on the overhead guard, evaluating the overall impact resistance and structural integrity of the overhead guard. The driver's head space is required to be ≥250mm after deformation. In the following text, the dynamic load test and the impact drop test will be collectively referred to as the strength test.

[0003] Chinese patent CN221781810U discloses a forklift overhead guard impact test frame, including a base. The base has two U-shaped connecting noses on the front and a support plate oriented left-right on the rear. The upper part of the connecting noses has connecting holes with a centerline oriented left-right, and the centers of all connecting holes are located on a left-right axis. The advantages of this patent are: simple to use and reduced strength testing costs. However, the rear support plate in this patent is adjustable only in the left-right direction, which can only accommodate left-right size adjustments at the rear end of the overhead guard and cannot accommodate strength tests of different sizes and models of overhead guards at the front and rear ends. Utility Model Content

[0004] This invention addresses the problem that existing impact testing frames cannot be adjusted to accommodate different front and rear end dimensions of various forklift overhead guard models. It provides an auxiliary chassis for strength testing of forklift overhead guards. The specific technical solution is as follows: An auxiliary chassis for strength testing of forklift overhead guards, wherein the overhead guard is connected to the auxiliary chassis, and the auxiliary chassis includes: left and right guide rails arranged parallel to each other along the front-rear direction of the overhead guard, the distance between the left and right guide rails being not less than the left and right width of the overhead guard; and a fixed base and a movable base respectively connected to the left and right guide rails, wherein the movable base moves along the length direction of the left and right guide rails to change the distance between the movable base and the fixed base.

[0005] Preferably, the left and right guide rails form a sliding groove; the movable base includes rollers disposed inside the sliding groove, the rollers being connected to the movable base plate via a mounting plate, and the movable base plate being perpendicular to the left and right guide rails.

[0006] Preferably, it further includes an adjustment assembly formed on the left and right guide rails. The adjustment assembly includes: a plurality of limiting holes penetrating the sliding groove, the arrangement direction of the limiting holes being consistent with the length direction of the left and right guide rails; and limiting pins connected to the limiting holes and the movable base, the limiting pins being able to pass through the limiting holes at different positions to prevent the movable base from moving away from the fixed base.

[0007] Preferably, both ends of the movable base and the fixed base have several through holes, and the length direction of the through holes is perpendicular to the length direction of the left and right guide rails.

[0008] Preferably, it also includes a front mounting base connected to both ends of the movable base and a rear mounting base connected to both ends of the fixed base; both the front mounting base and the rear mounting base are connected to the waist hole to adjust the left and right distance between the front mounting base or the rear mounting base; the top cover includes four mounting legs, which are connected to the front mounting base and the rear mounting base respectively.

[0009] Preferably, it also includes a front connecting plate that connects the parallel left and right guide rails, and the front connecting plate, the left and right guide rails and the fixed base form a rectangular frame.

[0010] As can be seen from the above technical solution, this utility model has the following beneficial effects: This invention changes the distance between a movable base and a fixed base by setting a movable base, and constrains the movement trajectory of the movable base by setting left and right guide rails. This allows top guards with different bottom widths to be fixedly connected to both the movable and fixed bases for strength testing. As a result, the same auxiliary chassis can accommodate top guards of various widths, reducing testing costs. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model; Figure 2 for Figure 1 AA section view in the middle; Figure 3 for Figure 1 Enlarged view of the structure at point B in the image; Figure 4 for Figure 1 Enlarged view of the structure at point C in the image; Figure 5 This is a schematic diagram showing the connection between the top support frame and an embodiment of this utility model.

[0012] In the diagram: 1. Left and right guide rails; 11. Sliding groove; 2. Movable base; 21. Roller; 22. Mounting plate; 23. Movable base plate; 3. Front connecting plate; 4. Fixed base; 5. Adjustment assembly; 51. Limiting hole; 52. Limiting pin; 6. Front mounting seat; 7. Rear mounting seat; 8. Top guard; 81. Mounting leg; 9. Waist hole. Detailed Implementation

[0013] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0014] In the description of the embodiments of this utility model, it should be noted that the terms "inner", "outer", "upper", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is usually placed when in use. They are only for the convenience of describing this utility model and 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 this utility model.

[0015] like Figure 1 As shown, this embodiment is an auxiliary chassis for a forklift overhead guard strength test, which includes: left and right guide rails 1 arranged parallel to each other along the front and rear direction of the overhead guard 8, the distance between the left and right guide rails 1 being not less than the left and right width of the overhead guard 8; and a fixed base 4 and a movable base 2 respectively connected to the left and right guide rails 1, the movable base 2 moving along the length direction of the left and right guide rails 1 to change the distance between the movable base 2 and the fixed base 4.

[0016] Specifically, the X-axis in the figure represents the front-to-back direction of this embodiment, with the positive direction of the X-axis being forward. The Y-axis represents the left-to-right direction of this embodiment, with the positive direction of the Y-axis being right.

[0017] Secondly, two left and right guide rails 1 are arranged parallel to each other along the X-axis. They are welded and fixed to the fixed base 4 in the rear direction and form a sliding or rolling connection with the movable base 2 in the front direction. The movable base 2 and the fixed base 4 are used to support the front and rear ends of the top cover 8, respectively. The distance between the two is the front-to-back length of the bottom end of the top cover 8. For different models of top cover 8, the front-to-back length of the bottom end is different. The movable base 2 moves along the left and right guide rails 1, thereby changing the distance between it and the fixed base 4, so as to adapt to the different front-to-back lengths of the bottom end of the top cover 8. This ensures that when the top cover 8 with different front-to-back lengths is tested for strength, only the position of the movable base 2 needs to be adjusted to use the same auxiliary chassis, thereby improving its applicability.

[0018] Secondly, when the distance between the left and right guide rails 1 is less than the width of the top cover 8 in the left and right direction, the left and right ends of the top cover 8 fall on the outside of the left and right guide rails 1. As a result, the pressure exerted by the bottom end of the top cover 8 on the movable base 2 or the fixed base 4 falls on the outside of the left and right guide rails 1. Consequently, the portion of the movable base 2 or the fixed base 4 that falls on the outside of the left and right guide rails 1 forms a cantilever beam structure, which is prone to bending deformation, causing the bottom end position of the top cover 8 to change. In the preferred embodiment, the distance between the left and right guide rails 1 is equal to the width of the top cover 8. The pressure exerted by the top cover 8 on the movable base 2 or the fixed base 4 falls on the left and right guide rails 1, so that the left and right guide rails 1 provide support for the movable base 2 or the fixed base 4, preventing deformation and ensuring the positional accuracy between the top cover 8 and the movable base 2 or the fixed base 4.

[0019] Furthermore, this embodiment also includes a front connecting plate 3 that connects the parallel left and right guide rails 1, and the front connecting plate 3, the left and right guide rails 1 and the fixed base 4 form a rectangular frame.

[0020] Specifically, the two ends of the front connecting plate 3 are fixed to the left and right guide rails 1 by welding or bolts, and the two ends of the fixed base 4 are fixed to the rear ends of the left and right guide rails 1 by welding, forming a rectangular frame that supports the top cover 8.

[0021] like Figure 2 As shown, the left and right guide rails 1 form a sliding groove 11; the movable base 2 includes a roller 21 disposed inside the sliding groove 11, the roller 21 is connected to the movable base plate 23 through the mounting plate 22, and the movable base plate 23 is perpendicular to the left and right guide rails 1.

[0022] Specifically, the opposite sides of the left and right guide rails 1 form a U-shaped sliding groove 11 with the same length as the left and right guide rails 1. Next, a movable base plate 23 is positioned above the left and right guide rails 1 and is welded and fixed to the mounting plate 22. The axis of the roller 21 is perpendicular to the mounting plate 22 and rotates relative to it. The axis of the roller 21 is perpendicular to the bottom of the sliding groove 11, and its axial side is tangent to the side of the U-shape, causing the roller 21 to roll relative to the sliding groove 11. This, in turn, drives the mounting plate 22 and the movable base plate 23 to move along the sliding groove 11. The movable base plate 23 is parallel to the fixed base 4 and perpendicular to the left and right guide rails 1, ensuring that the movable base plate 23 remains parallel to the fixed base 4 throughout its movement along the left and right guide rails 1, with the distance changing uniformly at all points. This guarantees that top supports 8 of different lengths can be connected to the movable base plate 23 and the fixed base 4.

[0023] like Figure 3As shown, this embodiment also includes an adjustment component 5 formed on the left and right guide rails 1. The adjustment component 5 includes: a plurality of limiting holes 51 penetrating the sliding long groove 11, the arrangement direction of the limiting holes 51 being consistent with the length direction of the left and right guide rails 1; and limiting pins 52 connected to the limiting holes 51 and the movable base 2. The limiting pins 52 can pass through the limiting holes 51 at different positions to prevent the movable base 2 from moving away from the fixed base 4.

[0024] Specifically, the adjustment components 5 are respectively set on the left and right guide rails 1 on the left and right sides; wherein, the axis of the limiting hole 51 interferes with the movement trajectory of the moving base 2, so that the limiting pin 52, which is coaxial with the limiting hole 51, can interfere with the movement trajectory of the moving base 2; when the top cover 8 is installed on the moving base 2 and the fixed base 4, and the strength test is performed on the top cover 8, the cross section of the top cover 8 is an inverted U-shaped structure. When it is subjected to downward pressure, the bottom end will move forward and backward. The rear end of the top cover 8 is fixed to the fixed base 4, and its front end moves forward with the moving base 2. In order to ensure the accuracy of the strength test results, the limiting pin 52 passes through the limiting hole 51 to prevent the roller 21 or the mounting plate 22 from moving forward, thereby ensuring that the distance between the moving base 2 and the fixed base 4 remains unchanged, and that the bottom end of the top cover 8 does not deform, thereby ensuring the accuracy of the test results.

[0025] Combination Figure 4 As shown, both ends of the movable base 2 and the fixed base 4 have several through holes 9, and the length direction of the holes 9 is perpendicular to the length direction of the left and right guide rails 1.

[0026] Specifically, four waist holes 9 are formed on the left or right end of the movable base plate 23 or the fixed base 4. The four waist holes 9 are divided into two groups and are symmetrically arranged on both sides of the left and right guide rails 1. Their length direction is the left and right direction, so that when the top cover 8 is fixedly connected to the movable base 2 or the fixed base 4 through the waist holes 9, its width can be slightly adjusted, thus better fitting the top cover 8.

[0027] Furthermore, this embodiment also includes a front mounting seat 6 connected to both ends of the movable base 2 and a rear mounting seat 7 connected to both ends of the fixed base 4; both the front mounting seat 6 and the rear mounting seat 7 are connected to the waist hole 9 to adjust the left and right distance between the front mounting seat 6 or the rear mounting seat 7.

[0028] Specifically, the front mounting base 6 is fixedly connected to the movable base 2 through the waist hole 9, and the rear mounting base 7 is fixedly connected to the fixed base 4 through the waist hole 9. When the distance between the movable base 2 and the fixed base 4 changes, the movable base 2 can drive the front mounting base 6 to move relative to the rear mounting base 7.

[0029] like Figure 5As shown, the top cover 8 includes four mounting legs 81. The mounting legs 81 are respectively connected to the front mounting seat 6 and the rear mounting seat 7 by bolts, thereby fixing the top cover 8 to the movable base 2 and the fixed base 4. Secondly, the shapes of the front mounting seat 6 and the rear mounting seat 7 are determined according to the shape of the bottom end of the mounting leg 81 in actual production, so that the two can be fixedly connected to the bottom end of the mounting leg 81 by bolts, thereby fixing the top cover 8 for strength testing.

[0030] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made 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.

[0031] The technologies, shapes, and structures not described in detail in this utility model are all known technologies.

Claims

1. An auxiliary chassis for strength testing of a forklift overhead guard, wherein the overhead guard (8) is connected to the auxiliary chassis, characterized in that, The auxiliary chassis includes: Left and right guide rails (1) are arranged parallel to each other along the front-back direction of the top cover (8), and the distance between the left and right guide rails (1) is not less than the left and right width of the top cover (8); and A fixed base (4) and a movable base (2) are respectively connected to the left and right guide rails (1). The movable base (2) moves along the length direction of the left and right guide rails (1) to change the distance between the movable base (2) and the fixed base (4).

2. The auxiliary chassis according to claim 1, characterized in that: The left and right guide rails (1) form sliding grooves (11); The movable base (2) includes a roller (21) disposed inside the sliding groove (11). The roller (21) is connected to the movable base plate (23) via a mounting plate (22). The movable base plate (23) is perpendicular to the left and right guide rails (1).

3. The auxiliary chassis according to claim 2, characterized in that, It also includes an adjustment assembly (5) formed on the left and right guide rails (1), the adjustment assembly (5) comprising: A plurality of limiting holes (51) penetrating the sliding groove (11), the arrangement direction of the limiting holes (51) being consistent with the length direction of the left and right guide rails (1); and A limiting pin (52) connected to the limiting hole (51) and the movable base (2) is able to pass through the limiting hole (51) at different positions to prevent the movable base (2) from moving away from the fixed base (4).

4. The auxiliary chassis according to claim 1, characterized in that: Both ends of the movable base (2) and the fixed base (4) are formed with several through waist holes (9), and the length direction of the waist holes (9) is perpendicular to the length direction of the left and right guide rails (1).

5. The auxiliary chassis according to claim 4, characterized in that, It also includes a front mounting base (6) connected to both ends of the movable base (2) and a rear mounting base (7) connected to both ends of the fixed base (4); Both the front mounting base (6) and the rear mounting base (7) are connected to the waist hole (9) to adjust the left and right distance between the front mounting base (6) or the rear mounting base (7); The top cover (8) includes four mounting legs (81), which are connected to the front mounting base (6) and the rear mounting base (7) respectively.

6. The auxiliary chassis according to claim 1, characterized in that, It also includes a front connecting plate (3) that connects the parallel left and right guide rails (1), and the front connecting plate (3), the left and right guide rails (1) and the fixed base (4) form a rectangular frame.

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