Verification tool for crawling ladder of agricultural machine

Abstract

The utility model relates to an agricultural machinery ladder stand verification tool comprising a base plate, the base plate is provided with a plurality of ladder stand support leg positioning holes, the head end and the tail end of the base plate are respectively provided with a group of width verification blocks used for detecting the width of a ladder stand, and the inner side of each width verification block is provided with a width verification surface; a plurality of levelness checking blocks, perpendicularity checking blocks and step checking blocks are further arranged on the base plate, the levelness checking blocks are arranged in the length direction of the two crawling ladder side beams, and supporting faces of the crawling ladder side beams are arranged at the tops of the levelness checking blocks; a perpendicularity checking surface is arranged on the inner side of the perpendicularity checking block; and the step inspection block is correspondingly provided with inspection angles at the left and right corners of the ladder step. When the crawling ladder is produced and machined, the tool can be used for checking the width, levelness and perpendicularity between side beams of the crawling ladder and the position of each step, and convenience is provided for welding of the crawling ladder; when detection is carried out, the tool can visually provide reference for all detection items, quality detection can be rapidly completed, and the quality detection precision and the detection efficiency are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to agricultural machinery manufacturing technical field especially relates to a farm machinery ladder stand check frock. BACKGROUND

[0002] Agricultural machinery especially large harvester, the body is huge and is assembled by multiple parts, in order to guarantee production quality, after each part is manufactured, the part is detected by quality inspection personnel and can only be assembled after passing, after assembly, the whole machine still needs to be tested by quality inspection personnel.

[0003] Ladder stand is installed in the part of farm machinery granary, and the ladder stand is welded by two side beams and multiple steps, and the welding precision of the ladder stand can only be grasped by workers according to experience, after welding, quality inspection personnel check and measure manually, this method is rough, and the testing precision is low, the steps are complicated and the efficiency is low, therefore, a check frock is developed to improve the welding precision and the testing efficiency of the ladder stand. UTILITY MODEL CONTENT

[0004] The utility model solves the technical problem to provide a farm machinery ladder stand check frock to improve the welding precision and the testing efficiency of the ladder stand.

[0005] To solve the above technical problem, the technical scheme of the utility model is as follows: a farm machinery ladder stand check frock, including the rectangular base plate, be equipped with multiple ladder stand support foot positioning hole on the base plate, the both ends of the base plate are provided with a group of width check block for detecting the width of the ladder stand, the inner side of the width check block is equipped with the width check surface perpendicular to the base plate, the distance value between each pair of width check surfaces is the check width value, the ladder stand is placed between the two groups of width check blocks, and the outer edge of the ladder stand side beam abuts against the width check surface, the base plate is also equipped with multiple horizontal degree check blocks, vertical degree check blocks and step inspection blocks, the horizontal degree check blocks are arranged along the length direction of the two ladder stand side beams, the top of the horizontal degree check block is equipped with the support surface for supporting the ladder stand side beam, and the support surfaces of each column of horizontal degree check blocks are arranged along the same horizontal plane, the inner side of the vertical degree check block is equipped with the vertical degree check surface perpendicular to the surface of the base plate, and the outer edge line of the ladder stand side beam is attached to the vertical degree check surface, the step inspection block is correspondingly arranged at the left and right corner portions of the ladder stand step, the step inspection block includes the check angle corresponding to the step corner portion, and the check angle includes the first check surface abutting against the outer edge of the step and the second check surface abutting against the inner side edge of the side beam.

[0006] As a preferred technical solution, the width checking block is plate-shaped, the bottom of the width checking block is fixedly connected with the base plate, the surface of the width checking block forms a 90° angle with the extension direction of the ladder side beam, and the width checking surface coincides with the side surface of the width checking block close to the ladder side beam.

[0007] As a further improvement, the number of the width checking blocks in each group is four, two width checking blocks located on the same side are arranged along the length direction of the base plate, and a width detection assembly is arranged between the two width checking blocks; the width detection assembly comprises a circular toggle, the top of the toggle is provided with a mounting arm, a mounting shaft is arranged between the two width checking blocks, and the mounting arm is hinged to the mounting shaft; a torsional spring is sleeved on the mounting shaft, one end of the torsional spring is mounted on the mounting shaft, and the other end is mounted on the mounting arm of the toggle, so that the edge of the toggle extends to the inside of the width checking block; a baffle is arranged at the position of the outer edge of the width checking block, and a first elastic switch is mounted on the baffle, when the toggle presses the first elastic switch, the first elastic switch is turned on to send a width detection signal.

[0008] As a preferred technical solution, the horizontal degree checking block is plate-shaped, the bottom of the horizontal degree checking block is fixedly connected with the base plate, and the surface of the horizontal degree checking block forms a 90° angle with the extension direction of the ladder side beam.

[0009] As a further improvement, the horizontal degree checking blocks are arranged side by side along the length direction of the ladder in two groups, and a horizontal degree detection assembly is mounted between the horizontal degree checking blocks in each group, the horizontal degree detection assembly comprises a mounting plate mounted between the two horizontal degree checking blocks, a second elastic switch is mounted on the mounting plate, a supporting plate for supporting the ladder side beam is arranged above the second elastic switch, the upper surface of the supporting plate coincides with the supporting surface, and the supporting plate is supported above the mounting plate by a spring; when the ladder side beam is supported, the supporting plate is pressed downward by gravity to press the spring, and when the supporting plate is pressed downward to press the second elastic switch, the second elastic switch is turned on to send a horizontal degree detection signal.

[0010] As a preferred technical solution, the vertical degree checking block is plate-shaped, the bottom of the vertical degree checking block is fixedly connected with the base plate, the surface of the vertical degree checking block is parallel to the extension direction of the ladder side beam, and the vertical degree checking surface coincides with the surface of the vertical degree checking block close to the ladder side beam.

[0011] As a preferred technical solution, the step checking block comprises two checking plates, the checking plates are assembled into the checking angle, and the bottom of the checking plate is fixedly mounted on the base plate.

[0012] The utility model discloses beneficial effect is: because developed this tooling, when the ladder stand production and processing, this tooling can check the width between the ladder stand side beam, levelness and perpendicularity and the position of each step, provide the convenience for the welding of ladder stand, when the quality inspection personnel detects, this tooling can intuitively provide reference to each detection item, and quality inspection is quickly completed, improve the precision and inspection efficiency of quality inspection. BRIEF DESCRIPTION OF DRAWINGS

[0013] In order to more clearly illustrate the technical scheme in the embodiment of the utility model or prior art, below will to the drawing needed to use in the embodiment or prior art description simple introduction, obviously, below description's drawing only some embodiments of the utility model, for the ordinary skilled person in the art comes, under the premise of not paying the creative labor, can also obtain other drawing according to these drawings.

[0014] Figure 1 It is the structural schematic diagram of embodiment one of the utility model;

[0015] Figure 2 It is the schematic diagram of using state of embodiment one of the utility model;

[0016] Figure 3 It is the top view of Figure 2 ;

[0017] Figure 4 It is the structural schematic diagram of embodiment two of the utility model;

[0018] Figure 5 It is the schematic diagram of width detection assembly in idle state in embodiment two of the utility model;

[0019] Figure 6 It is the schematic diagram of width detection assembly in detection state in embodiment two of the utility model;

[0020] Figure 7 It is the schematic diagram of levelness detection assembly in detection state in embodiment two of the utility model;

[0021] Figure 8 It is the structural schematic diagram of A-A in Figure 7 ;

[0022] In the diagram: 1-Baseboard; 101-Positioning hole; 2-Width verification block; 201-Width verification surface; 21-Pulley; 211-Mounting arm; 22-Mounting shaft; 23-Baffle; 24-First elastic switch; 3-Levelness verification block; 301-Support surface; 31-Mounting plate; 32-Second elastic switch; 33-Support plate; 34-Spring; 4-Verticality verification block; 401-Verticality verification surface; 5-Step verification block; 501-First verification surface; 502-Second verification surface; 51-Verification plate; 9-Ladder; 91-Feet; 92-Side beam; 93-Step. Detailed Implementation

[0023] Example 1:

[0024] like Figures 1 to 3 The illustrated agricultural machinery ladder calibration fixture includes a rectangular base plate 1 with multiple ladder support positioning holes 101 on the base plate 1. In the embodiment, the ladder 9 (see...) Figure 2 and Figure 3 The dotted line portion has four legs 91, and correspondingly, four positioning holes 101 are provided on the substrate 1 to accommodate the legs 91.

[0025] A set of width verification blocks 2 for detecting the width of the ladder is provided at both ends of the substrate 1. The inner side of the width verification block 2 is provided with a width verification surface 201 perpendicular to the substrate. In use, the ladder 9 is placed between the two sets of width verification blocks 2 and the outer edge of the ladder side beam 92 abuts against the width verification surface 201. The distance between the width verification surfaces of each pair of width verification blocks is set as the verification width value, so that the distance between the width verification surfaces of two relative width verification blocks is equal to the width of the ladder.

[0026] The width verification block 2 is plate-shaped. The bottom of the width verification block 201 is fixedly connected to the base plate 1. The bottom of the width verification block 2 is wider and gradually narrows upwards. The top is strip-shaped. The plate surface of the width verification block 2 forms a 90° angle with the extension direction of the ladder side beam 92. The width verification surface 201 coincides with the side of the width verification block 2 near the ladder side beam.

[0027] The base plate 1 is also provided with multiple levelness verification blocks 3, verticality verification blocks 4 and step verification blocks 5 to verify the levelness, verticality and installation position of the steps of the ladder.

[0028] The horizontality check blocks 3 are arranged along the length direction of the two ladder side beams 92, the horizontality check blocks on the left side are opposite to the left side beam of the ladder, the horizontality check blocks on the right side are opposite to the right side beam of the ladder, the top of the horizontality check block 3 is provided with a supporting surface 301 for supporting the side beam of the ladder, the supporting surfaces 301 of each column of horizontality check blocks 3 are arranged along the same horizontal plane, preferably, the shape of the supporting surface 301 is matched with the contour of the side beam 92, in the embodiment, the side beam 92 is a circular steel pipe, the shape of the supporting surface 301 is a semicircle with the same diameter as the outer diameter of the steel pipe, if the side beam is a square tube or a channel steel, the shape of the supporting surface should also be matched with the shape of the side beam.

[0029] The horizontality check block 3 is plate-shaped, the bottom of the horizontality check block 3 is fixedly connected with the base plate 1, and the plate surface of the horizontality check block 3 forms a 90° angle with the extension direction of the ladder side beam 92.

[0030] The inner side of the verticality check block 4 is provided with a verticality check surface 401 which is perpendicular to the surface of the base plate 1, and the outer edge line of the ladder side beam 92 is attached to the verticality check surface 401; the verticality check block 4 is plate-shaped, the bottom of the verticality check block 4 is fixedly connected with the base plate 1, the plate surface of the verticality check block 4 is parallel to the extension direction of the ladder side beam 92, the verticality check surface 401 coincides with the plate surface of the verticality check block 4 close to the ladder side beam, the shape of the verticality check block 4 is substantially the same as that of the width check block 2, the installation angle of the two is different by 90°, and the number of the verticality check block 4 is also four, which are respectively arranged at the two ends of the base plate 1.

[0031] The step check block 5 is correspondingly arranged at the left and right corners of the ladder step 93, the step check block 5 includes a check corner corresponding to the step corner, and the check corner includes a first check surface 501 abutting against the outer edge of the step 93 and a second check surface 502 abutting against the inner side edge of the side beam 92. The step check block 5 includes two check plates 51, the check plates 51 are assembled into a check corner, and the bottom of the check plate 51 is fixedly installed on the base plate 1.

[0032] The ladder check tool in the embodiment can be used in the welding process and quality inspection process of the ladder, in the welding process, the ladder supporting leg 91 is placed in the positioning hole 101 on the base plate 1, the two side beams 92 of the ladder are respectively supported by the two rows of horizontality check blocks 3, the outer edge of the ladder side beam 92 abuts against the width check surface 201 on the inner side of the width check block 2, the outer edge line of the ladder side beam 92 is attached to the verticality check surface of the verticality check block 4, the two ends of the plurality of steps 93 are abutted on one side of the step check block 5, and the spacing between the steps 93 is equal, so that the ladder 9 is assembled, then the worker welds the supporting leg 91 on the side beam 92, and then welds the two ends of the step 93 on the two side beams 92, thereby realizing the rapid welding of the ladder 9.

[0033] During quality inspection, the welded ladder 9 is placed on the pre-measured calibration fixture, so that the support leg 91 of the ladder 9 is inserted into the positioning hole 101. It is determined whether the position of the support leg 91 is completely matched with the positioning hole 101. If it is not matched, the welding of the support leg 91 is unqualified.

[0034] The two side beams of the ladder 9 are located between two pairs of width verification blocks 2. If there is too large a gap between the outer edge of the ladder side beam 92 and the width verification surface 201, the gap can be measured by inserting measuring pieces of different thicknesses between the side beam 92 and the width verification surface 201. If the gap is too large, the width inspection is unqualified. If the measuring piece with a thickness within the allowable error range cannot be inserted, the width inspection is qualified.

[0035] The levelness check block 3 is supported below the side beam 92. If the gap between the side beam 92 and the support surface 301 of the levelness check block 3 is too large, the levelness test will fail. The gap between the side beam 92 and the support surface 301 can be measured by steel needles of different diameters. If a steel needle with a diameter within the allowable error range can be inserted into the gap, the levelness test will fail. Since the side beam 92 is supported by multiple levelness check blocks 3, the gap between the support surface 301 of each levelness check block 3 and the side beam 92 must meet the quality inspection requirements for the levelness test to be qualified; otherwise, it will fail.

[0036] The method for testing verticality involves inserting test pieces of different thicknesses into the gap between the verticality verification surface 401 and the outer edge of the side beam 92 from both sides of the verticality verification block 4. If the test piece with a thickness within the allowable error range can be inserted into the gap between the verticality verification surface 401 and the outer edge of the side beam 92 from one or both sides of the verticality verification block 4, then the verticality verification is unqualified; otherwise, it is qualified.

[0037] After welding, the ladder step 93 should fit against the first verification surface 501 of the ladder step inspection block 5, and the second verification surface 502 should abut against the inner edge of the side beam 92. If a measuring piece with a thickness within the allowable error range can be inserted into the gap between the ladder step 93 and the first verification surface 501 of the ladder step inspection block 5, or if a measuring piece with a thickness within the allowable error range can be inserted into the gap between the inner edge of the side beam 92 and the second verification surface 502, then the welding of the ladder step 93 is unqualified.

[0038] Example 2:

[0039] The agricultural machinery ladder inspection fixture shown in this embodiment is an improvement on the first embodiment to improve inspection accuracy.

[0040] like Figures 4 to 8 As shown, a testing fixture for an agricultural machinery ladder includes a rectangular base plate 1. The base plate 1 has multiple ladder support positioning holes 101. In this embodiment, the ladder 9 (see...) Figures 4 to 8The section with the dashed line in the middle has four legs 91. Correspondingly, four positioning holes 101 are provided on the substrate 1 to accommodate the legs 91. During the test, if the position of the legs 91 of the ladder matches the positioning hole 101, the position of the ladder legs 101 is qualified.

[0041] A set of width verification blocks 2 for detecting the width of the ladder is provided at both ends of the substrate 1. The inner side of the width verification block 2 is provided with a width verification surface 201 perpendicular to the substrate. The width verification block 2 is plate-shaped. The bottom of the width verification block 201 is fixedly connected to the substrate 1. The bottom of the width verification block 2 is wider and gradually narrows upwards. The top is strip-shaped. The plate surface of the width verification block 2 forms a 90° angle with the extension direction of the ladder side beam 92. The width verification surface 201 coincides with the side of the width verification block 2 near the ladder side beam 92.

[0042] The number of width verification blocks 2 in each group is 4. Two width verification blocks 2 located on the same side are arranged along the length direction of the substrate 1 and a width detection component is provided between them. The width detection component includes a circular lever 21. The top of the lever 21 is provided with a mounting arm 211. A mounting shaft 22 is provided between the two width verification blocks 2. The mounting arm 211 is hinged to the mounting shaft 22. A torsion spring (not shown in the figure due to obstruction) is sleeved on the mounting shaft 22. One end of the torsion spring is installed on the mounting shaft 22, and the other end is installed on the mounting arm 211 of the lever 21, so that the edge of the lever 21 extends out of the inside of the width verification block 2. A baffle 23 is provided at the outer edge of the width verification block 2. A first elastic switch 24 is installed on the baffle 23. When the lever 21 presses the first elastic switch 24, the first elastic switch 24 is turned on and sends out a width detection signal.

[0043] Preferably, the first elastic switch 24 is a limit switch or a conventional input button. The first elastic switch 24 is electrically connected to an indicator light or a buzzer, or the signal line of the first elastic switch 24 can be directly connected to a computer or other testing equipment. When the ladder being tested is placed between the two width verification blocks 2, the side beam 92 presses the protruding edge of the lever 21, causing it to retract between the two width verification blocks 2. If the width value of the ladder is within the allowable error range, the lever 21 will move inward to press the first elastic switch 24, that is, to trigger the limit switch or press the button, illuminating the indicator light or turning on the buzzer to indicate that the width test is qualified. If the width of the ladder is too large, it cannot be placed between the two width verification blocks 2, and the width test is unqualified. If the width of the ladder is too small, when placed between the two width verification blocks 2, the inward movement distance of the lever 21 is too small, and it cannot press the first elastic switch 24. The first elastic switch 24 is not turned on, and neither the indicator light nor the buzzer can be activated, and the width test is unqualified.

[0044] The base plate 1 is also provided with multiple levelness verification blocks 3, verticality verification blocks 4 and step verification blocks 5 to verify the levelness, verticality and installation position of the steps of the ladder.

[0045] The levelness verification blocks 3 are arranged along the length of the two ladder side beams 92. The left row of levelness verification blocks is opposite to the left side beam of the ladder, and the right row of levelness verification blocks is opposite to the right side beam of the ladder. The top of the levelness verification blocks 3 is provided with a support surface 301 for supporting the ladder side beams. The support surface 301 of each row of levelness verification blocks 3 is arranged along the same horizontal plane. The levelness verification blocks 3 are plate-shaped. The bottom of the levelness verification blocks 3 is fixedly connected to the base plate 1. The plate surface of the levelness verification blocks 3 forms a 90° angle with the extension direction of the ladder side beams 92.

[0046] Two levelness verification blocks 3 are arranged side by side along the length of the ladder. A levelness detection component is installed between each group of levelness verification blocks 3. The levelness detection component includes a mounting plate 31 installed between two levelness verification blocks 3. A second elastic switch 32 is installed on the mounting plate 31. A support plate 33 for supporting the ladder side beam 92 is provided above the second elastic switch 32. The upper surface of the support plate 33 matches the support surface 301. The support plate 33 is supported above the mounting plate 31 by a spring 34. When supporting the ladder side beam 92, the support plate 33 moves down due to gravity and squeezes the spring 34. When the support plate 33 moves down and presses the second elastic switch 32, the second elastic switch 32 is turned on and sends a levelness detection signal.

[0047] Preferably, the second elastic switch 32 is a limit switch or a conventional input button, which is similar in principle to the first elastic switch 24. The second elastic switch 32 is electrically connected to an indicator light or a buzzer. Alternatively, the signal line of the second elastic switch can be directly connected to a computer or other detection equipment. When the ladder to be tested is placed between the two width verification blocks 2, the levelness verification block 3 is supported under the side beam 92. In the non-testing state, the upper surface of the support plate 33 is higher than the support surface 301 under the support of the spring 34. In the testing state, the support surface 301 and the support plate 33 are subjected to the pressure of the side beam, and the support plate 33 moves down to a position coplanar with the support surface 301. At this time, if the support plate 33 presses down and triggers the second elastic switch 32, the limit switch or button is turned on, and the indicator light or buzzer is turned on to indicate that the levelness test at this position is qualified. Since the side beam 92 is supported by multiple sets of levelness verification blocks 3, the second elastic switches of multiple levelness verification blocks and their detection components in the left row opposite to the left beam of the ladder are all triggered, indicating that the levelness test of the left beam is qualified. Similarly, the second elastic switches of the levelness verification blocks and their detection components in the right row opposite to the right beam of the ladder are all triggered, indicating that the levelness test of the right beam is qualified.

[0048] The inner side of the verticality verification block 4 is provided with a verticality verification surface 401 that is perpendicular to the surface of the substrate 1. The outer edge of the ladder side beam 92 is in contact with the verticality verification surface 401. The verticality verification block 4 is plate-shaped. The bottom of the verticality verification block 4 is fixedly connected to the substrate 1. The plate surface of the verticality verification block 4 is parallel to the extension direction of the ladder side beam 92. The verticality verification surface 401 coincides with the plate surface of the verticality verification block 4 near the ladder side beam. The shape of the verticality verification block 4 is approximately the same as that of the width verification block 2. The installation angles of the two differ by 90°. There are also 4 verticality verification blocks 4, which are respectively set at the beginning and end of the substrate 1.

[0049] During testing, if a measuring piece with a thickness within the allowable error range can be inserted into the gap between the verticality verification surface 401 and the outer edge of the side beam 92 from one or both sides of the verticality verification block 4, the verticality verification is unqualified; otherwise, it is qualified.

[0050] The step inspection block 5 is correspondingly installed at the left and right corners of the ladder step 93. The step inspection block 5 includes a verification angle corresponding to the corner of the step. The verification angle includes a first verification surface 501 that abuts against the outer edge of the step 93 and a second verification surface 502 that abuts against the inner side of the side beam 92. The step inspection block 5 includes two verification plates 51, which are assembled into a verification angle. The bottom of the verification plates 51 is fixedly installed on the base plate 1.

[0051] During testing, if a measuring piece with a thickness within the allowable error range can be inserted into the gap between step 93 and the first verification surface 501 of step inspection block 5, or if a measuring piece with a thickness within the allowable error range can be inserted into the gap between the inner edge of side beam 92 and the second verification surface 502, then the welding of step 93 is unqualified.

[0052] Other detection structures, such as those with a width verification surface, a support surface for a levelness inspection block, a verticality verification surface, and a detection surface or detection angle for a step inspection block, can equivalently replace the detection structures of the width verification block, levelness verification block, verticality verification block, and step inspection block in this embodiment, and are all within the protection scope of this utility model.

[0053] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. An agricultural machine ladder verification tool, characterized by: The base plate includes a rectangle, and a plurality of ladder foot positioning holes are arranged on the base plate. A set of width calibration blocks for detecting the width of the ladder are arranged at both ends of the base plate. The inner side of the width calibration block is provided with a width calibration surface perpendicular to the base plate. The distance between the width calibration surfaces of each pair of width calibration blocks is a calibration width value. The ladder is placed between the two sets of width calibration blocks, and the outer edge of the ladder side beam is in contact with the width calibration surface. A plurality of horizontal calibration blocks, vertical calibration blocks and step calibration blocks are arranged on the base plate. The horizontal calibration blocks are arranged along the length direction of the two ladder side beams. The top of the horizontal calibration block is provided with a supporting surface for supporting the ladder side beam. The supporting surfaces of each column of horizontal calibration blocks are arranged along the same horizontal plane. The inner side of the vertical calibration block is provided with a vertical calibration surface perpendicular to the surface of the base plate. The outer edge line of the ladder side beam is in contact with the vertical calibration surface. The step calibration block is arranged at the left and right corners of the ladder step. The step calibration block includes a calibration corner corresponding to the corner of the step. The calibration corner includes a first calibration surface in contact with the outer edge of the step and a second calibration surface in contact with the inner side edge of the side beam.

2. An agricultural machine ladder verification fixture as claimed in claim 1, characterised in that: The width calibration block is plate-shaped. The bottom of the width calibration block is fixedly connected with the base plate. The plate surface of the width calibration block forms a 90° angle with the extension direction of the ladder side beam. The width calibration surface coincides with the side surface of the width calibration block close to the ladder side beam.

3. An agricultural machine ladder checking tool as claimed in claim 1 or 2, characterised in that: The number of each set of width calibration blocks is four. Two width calibration blocks on the same side are arranged along the length direction of the base plate, and a width detection assembly is arranged between the two width calibration blocks. The width detection assembly includes a circular knob. The top of the knob is provided with a mounting arm. An installation shaft is arranged between the two width calibration blocks. The mounting arm is hinged to the installation shaft. A torsional spring is sleeved on the installation shaft. One end of the torsional spring is mounted on the installation shaft, and the other end is mounted on the mounting arm of the knob. The edge of the knob protrudes into the inner side of the width calibration block. A baffle is arranged at the position of the outer edge of the width calibration block. A first elastic switch is mounted on the baffle. When the knob presses the first elastic switch, the first elastic switch is turned on to send a width detection signal.

4. An agricultural machine ladder verification fixture as claimed in claim 1, wherein: The horizontal calibration block is plate-shaped. The bottom of the horizontal calibration block is fixedly connected with the base plate. The plate surface of the horizontal calibration block forms a 90° angle with the extension direction of the ladder side beam.

5. An agricultural machine ladder checking tool as claimed in claim 1 or 4, wherein: Two horizontal calibration blocks in each group are arranged side by side along the length direction of the ladder. A horizontal degree detection assembly is mounted between the two horizontal calibration blocks. The horizontal degree detection assembly includes a mounting plate mounted between the two horizontal calibration blocks. A second elastic switch is mounted on the mounting plate. A supporting plate is arranged above the second elastic switch for supporting the ladder side beam. The upper surface of the supporting plate coincides with the supporting surface. The supporting plate is supported above the mounting plate by a spring. When the supporting plate is pressed to the second elastic switch due to gravity, the second elastic switch is turned on to send a horizontal degree detection signal.

6. An agricultural machine ladder verification fixture as claimed in claim 1, wherein: The perpendicularity checking block is plate-shaped, the bottom of the perpendicularity checking block is fixedly connected with the base plate, the surface of the perpendicularity checking block is parallel to the extending direction of the ladder side beam, and the perpendicularity checking surface coincides with the surface of the perpendicularity checking block close to the ladder side beam.

7. An agricultural machine ladder verification fixture as claimed in claim 1, wherein: The step checking block comprises two checking plates, the checking plates are assembled into the checking angle, and the bottom of the checking plate is fixedly installed on the base plate.

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