Tension limiting strength testing device for herringbone ladder

Abstract

The utility model discloses a herringbone ladder tension limiting strength test device, and relates to the technical field of herringbone ladder tension limiting strength test devices, the herringbone ladder tension limiting strength test device comprises a test box and a control box, the test box is connected with the control box through an electric wire, one side of the test box is connected with a supporting plate, and one side, away from the supporting plate, of the test box is slidably connected with a supporting rod; the test box is connected with a driving piece used for driving the supporting rod to slide in the direction close to or away from the test box, and the supporting rod is connected with an abutting plate. The driving piece drives the supporting rod to slide in the direction away from the test box, namely, the abutting plate slides in the direction away from the test box, one side of the test box abuts against one pedal, the abutting plate abuts against the other pedal, the opposite sides of the two pedals are stressed, the control box displays the test result, and therefore the tension limiting strength of the herringbone ladder can be conveniently tested.

Description

Technical Field

[0001] The present application relates to the technical field of a herringbone ladder tension limit strength test device, and in particular to a herringbone ladder tension limit strength test device. Background Art

[0002] The ladder tension strength test device is an important tool for evaluating the safety performance of the ladder. Through this device, we can fully understand the structural stability and safety performance of the ladder when it is under load. The ladder is connected with several fixed ropes, which are distributed along the length of the ladder. The fixed ropes support the opening of the ladder and improve the safety of the ladder.

[0003] The existing Chinese patent with announcement number CN205228799U discloses a mobile ladder testing machine, which includes a main frame, a ladder bracket connected to the main frame, and a straight ladder is fixed on the ladder bracket; a slide rail is provided on one side of the main frame, and a pulley is provided on the slide rail; the mobile ladder testing machine also includes a driving mechanism and a steel wire rope, one end of the steel wire rope is connected to the driving mechanism around the pulley, and the other end is connected to the crossbar on the straight ladder.

[0004] In the above mobile ladder testing machine, the main frame plays a supporting role, the ladder can be set up on the ladder bracket, the slide rail can change the position of the pulley to guide the wire rope at different positions; the driving mechanism generates force on the horizontal rails on the ladder through the wire rope to test. However, the above mobile ladder testing machine still has some shortcomings, such as: it is not easy to test the tensile strength of the ladder, which needs to be improved. Utility Model Content

[0005] The purpose of the present application is to provide a device for testing the tensile strength of a stepladder, in order to facilitate testing the tensile strength of the stepladder.

[0006] A stepladder tension strength test device provided in the present application adopts the following technical solution: it includes a test box and a control box, the test box is connected to the control box by electric wires, one side of the test box is connected to a support plate, the side of the test box away from the support plate is slidably connected to a support rod, the test box is connected to a driving member for driving the support rod to slide in a direction close to or away from the test box, and the support rod is connected to an abutment plate.

[0007] By adopting the above technical solution, the support plate is placed on the pedal of the stepladder, the support rod is placed on the pedal of another stepladder, and the abutment plate is located between the two opposite pedals. The driving member drives the support rod to slide in the direction away from the test box, that is, the abutment plate slides in the direction away from the test box, one side of the test box abuts against one of the pedals, and the abutment plate abuts against the other pedal. The opposite sides of the two pedals are stressed, and the control box displays the test results, thereby facilitating the testing of the tensile strength of the stepladder.

[0008] Optionally, a first limit plate is connected to a side of the test box away from the support rod, the support plate is connected to a side of the abutment plate away from the test box, and the support plate is connected to a second limit plate.

[0009] By adopting the above technical solution, when the support plate is placed on the step of the stepladder, the step is located between the first limit plate and the second limit plate, and the first limit plate and the second limit plate limit the movement of the test box, thereby improving the stability of the test box placed on the stepladder. When the step is under tension, the step directly contacts the first limit plate, preventing the test box from being damaged due to direct contact with the step.

[0010] Optionally, both the first limiting plate and the abutting plate are provided with limiting grooves.

[0011] By adopting the above technical solution, when the test box is placed on the stepladder, the fixing rope is inserted into the limiting groove, and the fixing limits the movement of the test box, thereby improving the stability of the placement of the test box.

[0012] Optionally, the abutment plate is detachably connected to the support rod, and the abutment plate and the support rod are connected via a fixed structure.

[0013] By adopting the above technical solution, the distance between the abutment plate and the test box is adjusted according to the distance between the two relative pedals, that is, the distance between the abutment plate and the corresponding pedal is shortened, thereby reducing the sliding distance of the support rod, that is, reducing the damage to the support rod due to friction, thereby protecting the support rod.

[0014] Optionally, the abutment plate is detachably connected to a fixing plate, the fixing plate and the abutment plate are connected via a locking member, and the fixing structure is used to connect the fixing plate to the support rod.

[0015] By adopting the above technical solution, when the abutting plate is damaged after multiple abutments, it is only necessary to loosen the locking piece so that the abutting plate can be separated from the fixing plate, thereby facilitating replacement of the abutting plate.

[0016] Optionally, the abutment plate is provided with a through hole for slidingly cooperating with the support rod, the through hole passes through the fixing plate, the fixing structure includes a fixing rod slidably connected to the fixing plate, the fixing plate is provided with a clearance hole for the fixing rod to pass through, the clearance hole is connected to the through hole, the support rod is provided with a plurality of gear holes for the fixing rod to pass through, the plurality of gear holes are distributed along the length direction of the support rod, the fixing rod is connected with a protrusion, and the fixing rod is threadedly connected with a threaded rod.

[0017] By adopting the above technical solution, the fixed plate and the abutment plate are moved to corresponding positions according to actual needs, so that the clearance hole corresponds to the corresponding gear hole, and the through hole and the sliding cooperation of the support rod play a guiding and limiting role in the sliding of the fixed plate and the abutment plate, thereby improving the sliding stability of the fixed plate and the abutment plate. One end of the fixed rod passes through the clearance hole and the gear hole in turn, and then the threaded rod is threadedly connected to the fixed rod, so that the support rod is located between the threaded rod and the protrusion, preventing the fixed rod from being separated from the fixed plate, thereby improving the stability of the abutment plate placed on the support rod.

[0018] Optionally, two support columns are further included, the support plate is detachably connected to one of the support columns, the abutment plate is located between the two support columns, each support column is slidably connected to two connecting plates, each connecting plate is threadedly connected to a connecting rod, the connecting rod is connected to a boss, each support column is detachably connected to two limiting members for limiting the connecting plate from detaching from the support column, and the connecting plate is located between the two limiting members.

[0019] By adopting the above technical solution, when it is necessary to test other positions of the ladder, the connecting rod is placed on the fixed rope, the outer peripheral surface of the connecting rod abuts against the inner side of the ladder, the driving member drives the abutment plate to slide in the direction away from the test box, and the abutment plate abuts against one of the support columns, so that the two support columns move in the direction away from each other, that is, the connecting plates respectively located on the two support columns move in the direction away from each other, and the connecting rod applies force to the inner side of the ladder and makes the inner sides facing each other have a force moving away from each other, thereby testing the tensile strength of the ladder. The two limiters limit the movement of the connecting plate to prevent the connecting plate from detaching from the support column.

[0020] Optionally, the limit member includes a limit block, the limit block is provided with a mounting hole for slidingly cooperating with the support column, the limit block is provided with a clearance cavity and an opening, the clearance cavity and the opening are both connected to the mounting hole, the mounting hole is located between the opening and the clearance cavity, and the limit block is threadedly connected to the limit rod.

[0021] By adopting the above technical solution, the support column is inserted into the installation hole, and the limit rod is rotated to reduce the size of the opening, and the inner wall of the installation hole clamps the support column, thereby realizing the installation of the limit block on the support column.

[0022] Optionally, the limiting rod is connected to an active rod.

[0023] By adopting the above technical solution, the active rod can conveniently provide a gripping point to facilitate driving the limit rod to rotate.

[0024] Optionally, the connecting plate is provided with a hollow area.

[0025] By adopting the above technical solution, the use of connecting plate materials in the hollow area is reduced.

[0026] In summary, the present application includes at least one of the following beneficial technical effects:

[0027] 1. The driving member drives the support rod to slide in the direction away from the test box, that is, the abutment plate slides in the direction away from the test box, one side of the test box abuts against one of the pedals, and the abutment plate abuts against the other pedal. The two pedals are subjected to force on the opposite sides. The control box displays the test results, thereby facilitating the testing of the tensile strength of the stepladder.

[0028] 2. Fixing limits the movement of the test box, thereby improving the stability of the test box placement. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the overall structure of Example 1 of the present application.

[0030] Figure 2 yes Figure 1 A magnified image of area A.

[0031] Figure 3 It is a schematic diagram of the overall structure of a herringbone ladder and Example 1 of the present application.

[0032] Figure 4 yes Figure 3 Magnified view of area B.

[0033] Figure 5 It is a schematic diagram of the overall structure of Example 2 of the present application.

[0034] Figure 6 yes Figure 5 Magnified view of region C.

[0035] Figure 7 It is one of the partial structural schematic diagrams of Example 2 of the present application, showing the connecting plate.

[0036] Figure 8 This is the second partial structural diagram of Example 2 of the present application, showing a limit member.

[0037] Fig. 9 It is a schematic diagram of the overall structure of the herringbone ladder and Example 2 of the present application.

[0038] Fig.10 yes Fig. 9 Magnified view of area D.

[0039] Explanation of the accompanying drawings: 1. test box; 11. first limit plate; 12. support plate; 13. second limit plate; 2. support rod; 21. gear hole; 3. abutment plate; 31. limit groove; 32. through hole; 4. fixing plate; 41. clearance hole; 5. fixing structure; 51. fixing rod; 52. protrusion; 53. threaded rod; 6. support column; 7. connecting plate; 71. hollow area; 72. connecting rod; 73. boss; 8. limit member; 81. limit block; 811. mounting hole; 812. clearance cavity; 813. opening; 82. limit rod; 83. active rod. DETAILED DESCRIPTION

[0040] The following is combined with Figure 1 -Attached Fig.10 This application is described in further detail.

[0041] The embodiment of the present application discloses a device for testing the tension strength of a stepladder.

[0042] Example 1

[0043] like Figure 1 As shown, it includes a test box 1 and a control box (not shown in the drawings), the test box 1 and the control box are connected by wires (not shown in the drawings), the signal output end of the control box is connected to the signal input end of the test box 1, and the controller can display the test results of the test box 1. A first limit plate 11 is detachably connected to one side of the test box 1, the first limit plate 11 is connected to the test box 1 by bolts, a support plate 12 is fixedly connected to the side of the first limit plate 11 away from the test box 1, and the support plate 12 is fixedly connected to a second limit plate 13 parallel to the first limit plate 11, and the first limit plate 11 and the second limit plate 13 are both vertically distributed with the support plate 12.

[0044] Combination Figure 1 and Figure 2 As shown, the side of the test box 1 away from the support plate 12 is slidably connected to a support rod 2, and a driving member (not shown in the figure) for driving the support rod 2 to slide toward or away from the test box 1 is fixedly connected inside the test box 1. The driving member is an electric cylinder, and the signal output end of the control box is connected to the signal input end of the driving member. The end of the support rod 2 close to the driving member is fixedly connected to the output end of the driving member. The support rod 2 is detachably connected to an abutment plate 3, and both the abutment plate 3 and the first limit plate 11 are provided with a limit groove 31.

[0045] Combination Figure 2 , Figure 3 and Figure 4As shown, a fixing plate 4 is detachably connected to one side of the abutment plate 3, and the fixing plate 4 is connected to the abutment plate 3 by a locking member, which is a bolt, and the fixing plate 4 is connected to the support rod 2 by a fixing structure 5. The abutment plate 3 is provided with a through hole 32 for slidingly cooperating with the support rod 2, and the through hole 32 passes through the fixing plate 4. The fixing structure 5 includes a fixing rod 51 slidably connected to the fixing plate 4, and the fixing plate 4 is provided with a clearance hole 41 for the fixing rod 51 to pass through, and the clearance hole 41 is connected to the through hole 32. The outer peripheral surface of the support rod 2 is provided with a plurality of gear holes 21 for the fixing rod 51 to pass through, and the plurality of gear holes 21 are evenly distributed along the length direction of the support rod 2. A protrusion 52 is fixedly connected to one end of the fixing rod 51, and a threaded rod 53 is threadedly connected to the other end of the fixing rod 51.

[0046] The implementation principle of the herringbone ladder tension strength test device in Example 1 of the present application is as follows:

[0047] The support plate 12 is placed on the pedal of the stepladder, and the support rod 2 is placed on the pedal of another stepladder. At this time, the abutment plate 3 is located between the two opposite pedals. The driving member drives the support rod 2 to slide in the direction away from the test box 1, that is, the abutment plate 3 slides in the direction away from the test box 1. One side of the test box 1 abuts against one of the pedals, and the abutment plate 3 abuts against the other pedal. The two pedals are subjected to force on the opposite sides. The control box displays the test results, so as to facilitate the test of the tensile strength of the stepladder.

[0048] Example 2

[0049] The difference between this embodiment and embodiment 1 is that, Figure 5 , Figure 6 and Figure 7 As shown, two support columns 6 are also included, and a support plate 12 is detachably connected to one of the support columns 6, and the support plate 12 is connected to the support column 6 by bolts. The abutment plate 3 is located between the two support columns 6, and each support column 6 is relatively slidably connected to two connecting plates 7, and the support plate 12 on one support column 6 corresponds to the support plate 12 on the other support column 6. Each connecting plate 7 is provided with a hollow area 71, and one end of each connecting plate 7 away from the support column 6 is threadedly connected to two connecting rods 72, and one end of each connecting rod 72 is fixedly connected to a boss 73. The hollow area 71 is located between the support column 6 and the two connecting rods 72, and one connecting rod 72 is located between the other connecting rod 72 and the hollow area 71.

[0050] Combination Figure 8 , Fig. 9 and Fig.10As shown, each support column 6 is detachably connected with two limit members 8 for limiting the connection plate 7 from being separated from the support column 6, and the two connection plates 7 are located between the two limit members 8. The limit member 8 includes a limit block 81, and the limit block 81 is provided with a mounting hole 811 for slidingly cooperating with the support column 6. The limit block 81 is provided with a clearance cavity 812 and an opening 813, and the clearance cavity 812 and the opening 813 are both connected with the mounting hole 811, and the mounting hole 811 is located between the clearance cavity 812 and the opening 813. The limit block 81 is threadedly connected with the limit rod 82, and one end of the limit rod 82 is fixedly connected with the active rod 83. The limit block 81 is provided with a connecting hole for the limit rod 82 to pass through and a threaded hole for threading with the limit rod 82, and the threaded hole and the connecting hole are both connected with the opening 813, and the opening 813 is located between the threaded hole and the connecting hole.

[0051] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A herringbone ladder tension strength test device, characterized in that: The invention comprises a test box (1) and a control box, wherein the test box (1) is connected to the control box via an electric wire, one side of the test box (1) is connected to a support plate (12), a side of the test box (1) away from the support plate (12) is slidably connected to a support rod (2), the test box (1) is connected to a driving member for driving the support rod (2) to slide in a direction close to or away from the test box (1), and the support rod (2) is connected to an abutment plate (3).

2. The herringbone ladder tension strength test device according to claim 1, characterized in that: A first limit plate (11) is connected to a side of the test box (1) away from the support rod (2), the support plate (12) is connected to a side of the abutment plate (3) away from the test box (1), and the support plate (12) is connected to a second limit plate (13).

3. The herringbone ladder tension strength test device according to claim 2, characterized in that: The first limiting plate (11) and the abutting plate (3) are both provided with limiting grooves (31).

4. The herringbone ladder tension strength test device according to claim 1, characterized in that: The abutment plate (3) is detachably connected to the support rod (2), and the abutment plate (3) and the support rod (2) are connected via a fixing structure (5).

5. The herringbone ladder tension strength test device according to claim 4, characterized in that: The abutment plate (3) is detachably connected to a fixing plate (4); the fixing plate (4) and the abutment plate (3) are connected via a locking member; and the fixing structure (5) is used to connect the fixing plate (4) to the support rod (2).

6. The herringbone ladder tension strength test device according to claim 5, characterized in that: The abutment plate (3) is provided with a through hole (32) for slidably cooperating with the support rod (2), the through hole (32) passing through the fixing plate (4), the fixing structure (5) comprising a fixing rod (51) slidably connected to the fixing plate (4), the fixing plate (4) being provided with a clearance hole (41) for the fixing rod (51) to pass through, the clearance hole (41) being communicated with the through hole (32), the support rod (2) being provided with a plurality of gear holes (21) for the fixing rod (51) to pass through, the plurality of gear holes (21) being distributed along the length direction of the support rod (2), the fixing rod (51) being connected with a protrusion (52), and the fixing rod (51) being threadedly connected with a threaded rod (53).

7. The herringbone ladder tension strength test device according to claim 1, characterized in that: It also comprises two support columns (6), the support plate (12) being detachably connected to one of the support columns (6), the abutment plate (3) being located between the two support columns (6), each support column (6) being slidably connected to two connection plates (7), each connection plate (7) being threadedly connected to a connection rod (72), the connection rod (72) being connected to a boss (73), each support column (6) being detachably connected to two limiting members (8) for limiting the connection plate (7) from being separated from the support column (6), the connection plate (7) being located between the two limiting members (8).

8. The herringbone ladder tension strength test device according to claim 7, characterized in that: The limiting member (8) comprises a limiting block (81), the limiting block (81) being provided with a mounting hole (811) for slidingly cooperating with the supporting column (6), the limiting block (81) being provided with a clearance cavity (812) and an opening (813), the clearance cavity (812) and the opening (813) both being in communication with the mounting hole (811), the mounting hole (811) being located between the opening (813) and the clearance cavity (812), and the limiting block (81) being threadedly connected to the limiting rod (82).

9. The herringbone ladder tension strength test device according to claim 8, characterized in that: The limiting rod (82) is connected to an active rod (83).

10. The stepladder tension strength test device according to claim 7, characterized in that: The connecting plate (7) is provided with a hollow area (71).

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