Pull rod precision detection assembly of railway freight car

Abstract

This utility model belongs to the field of freight train equipment processing, and relates to a precision detection component for the tie rod of a railway freight car. It can conveniently measure the positional deviation between the centerline of the through hole of the centering tie rod and the centerline of the intermediate rod. The technical solution includes: a V-shaped bracket, a connecting rod, and a measuring plate. The V-shaped bracket is a vertical plate with an inverted V-shaped opening at the lower end and a movable groove at the upper end, with the movable groove and the inverted V-shaped opening sharing a common centerline. The connecting rod is a straight rod with a cross-section adapted to the movable groove. The connecting rod is movably inserted into the movable grooves of the two V-shaped brackets, and a threaded rod is fixed to each of the two vertical sides of the connecting rod. The measuring plate is a straight plate fixed to the end of the connecting rod. The relative distance between the vertical side of the measuring plate and the centerline of the movable groove is fixed and known.

Description

Technical Field

[0001] This utility model belongs to the field of freight train equipment processing and relates to a tie rod accuracy detection component for railway freight cars. Background Technology

[0002] The tie rod is an important component of the mainstream bogies for current railway freight cars. It is connected to the fixed lever and the floating lever at both ends, and plays the role of transmitting braking force and relieving force. It bears a large force when the vehicle is braking. If the quality does not meet the process requirements, it will affect the assembly of the bogie and may cause deformation or breakage during braking, which will endanger the safety of train operation.

[0003] The tie rod is a long forging with wide ends and a narrow middle. It is made from round steel with a diameter of Ф90 mm and a length of 740 mm. After forging, its shape is machined, as shown in the attached figure. Figure 1 As shown, the tie rod consists of a central section and two end heads. The end heads have slots in the middle and eight through holes machined to connect the movable lever and the fixed lever. To ensure machining quality, the drawing requires the inspection of the positional deviation of the hole centers relative to the tie rod centerline, as well as the symmetry deviation of the end opening thickness relative to the tie rod centerline, as shown in the attached diagram. Figure 2 As shown, these two geometric tolerances usually require inspection by a skilled technician, and the process is tedious and prone to errors.

[0004] The current method for measuring the position of the tie rod hole is as follows: (1) First, a large platform and two large V-shaped irons are needed to support the tie rod; (2) The tie rod is aligned by placing it on the two V-shaped irons and using a wide-seat right angle ruler to press against the machined surface at the end of the tie rod. The tie rod is rotated continuously to ensure that the right angle ruler is completely in contact with the machined surface; (3) The height of the tie rod is measured by using a height gauge and the diameter of the rod at that position is measured by using a vernier caliper. The height minus half of the diameter is the height H of the tie rod centerline relative to the plate; (4) The height of the lowest point of the hole is measured by using a height gauge and a pin gauge and the diameter of the hole is measured by using a vernier caliper. The height plus half of the diameter is the height h of the hole centerline relative to the plate; (5) The difference between the height H and the height h is the position of the tie rod hole relative to the centerline. The position of other holes is also measured in this way.

[0005] As can be seen, the entire measurement process is quite complex. Multi-point measurements are prone to cumulative errors, resulting in inaccurate measurement results. If these two geometric tolerances are incorrectly machined or inspected, they may directly affect the bogie braking, thereby affecting the train's braking performance. Utility Model Content

[0006] To overcome the shortcomings of the aforementioned related technologies, this utility model proposes a tie rod accuracy detection component for railway freight cars, which can conveniently measure the positional deviation between the center line of the through hole of the center tie rod and the center line of the intermediate rod.

[0007] To achieve the above technical objectives, this utility model provides a tie rod accuracy detection component for railway freight cars, applicable to the central tie rod of the bogie of railway freight cars. The central tie rod includes: a middle rod part and end heads fixed to both ends of the middle rod part. The end heads are provided with opening slots and two through holes that pass through the opening slots.

[0008] The railway freight car tie rod accuracy detection assembly includes: a V-shaped bracket, a connecting rod, a sliding pad, and a measuring plate. The V-shaped bracket is a vertically arranged plate with an inverted V-shaped opening at its lower end and a movable groove at its upper end, with the movable groove and the inverted V-shaped opening sharing a common centerline. The connecting rod is a straight rod with a cross-section adapted to the movable groove. The connecting rod is movably inserted into at least two movable grooves of the V-shaped bracket, and a threaded rod is fixed to each of the two vertical sides of the connecting rod. The sliding pad includes a base plate and two parallel vertical plates fixed to the base plate. Each vertical plate has an elongated slot. The connecting rod is movably positioned between the two vertical plates, with each threaded rod correspondingly inserted into one of the elongated slots. The measuring plate is a straight plate fixed to the end of the connecting rod. The relative distance between the vertical side of the measuring plate and the centerline of the movable groove is fixed and known.

[0009] Preferably, the length of the measuring plate is not less than the distance between the center points of the two through holes on the end.

[0010] Preferably, the connecting rod has a trapezoidal cross-section, and the movable groove of the V-shaped bracket is a dovetail groove structure adapted to the cross-section of the connecting rod.

[0011] The beneficial effects of this utility model are as follows:

[0012] This invention uses two V-shaped brackets. When the two sides of the V-shaped openings of the two V-shaped brackets are completely in contact with the side wall of the middle rod, it can be determined that the connecting rod and the middle rod share the same center line. This provides an accurate basis for determining the positional deviation between the center point of the through hole and the center line of the middle rod by measuring the distance between the side wall of the through hole at the measuring end and the measuring plate.

[0013] This invention has the advantages of convenient operation and high measurement accuracy, making it convenient for rapid on-site testing. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 The tie rod described in this utility model;

[0016] Figure 2 This is a geometrical tolerance diagram of the tie rod described in this utility model;

[0017] Figure 3 This is a diagram showing the usage state of this utility model;

[0018] Figure 4 This is a structural diagram of the present invention. Detailed Implementation

[0019] To make the above-mentioned objectives, features, and advantages of this utility model more apparent and understandable, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0020] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. 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.

[0021] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0022] Example 1

[0023] like Figure 3 and Figure 4As shown, this utility model provides a template for testing the position and symmetry of a tie rod in a railway freight car, applicable to the tie rod 1 of a railway freight car bogie. Taking the tie rod of a K6 type bogie as an example, the tie rod 1 includes: a middle rod portion 11 and end heads 12 fixed to both ends of the middle rod portion 11. The end heads 12 are provided with opening slots and two through holes 13 that pass through the opening slots.

[0024] The railway freight car tie rod 1 position and symmetry testing template includes: a V-shaped bracket 2, a connecting rod 3, a sliding pad 4, and a measuring plate 5. The V-shaped bracket 2 is a vertically arranged plate with an inverted V-shaped opening at its lower end and a movable groove at its upper end, with the movable groove and the inverted V-shaped opening sharing a common centerline. The connecting rod 3 is a straight rod with a cross-section adapted to the movable groove. The connecting rod 3 is movably inserted into at least two movable grooves of the V-shaped bracket 2, and a threaded rod is fixed to each of its two vertical sides. The sliding pad 4 includes a base plate and two vertical plates vertically fixed to the base plate. The two vertical plates are parallel and each has a long slot. The connecting rod 3 is movably positioned between the two vertical plates, with each threaded rod correspondingly inserted into one of the long slots. The measuring plate 5 is a straight plate fixed to the end of the connecting rod 3. The relative distance between the vertical side of the measuring plate 5 and the centerline of the movable groove is fixed and known.

[0025] The length of the measuring plate 5 is not less than the distance between the center points of the two through holes 13 on the end head 12.

[0026] The connecting rod 3 has a trapezoidal cross-section, and the movable groove of the V-shaped bracket 2 is a dovetail groove structure adapted to the cross-section of the connecting rod 3.

[0027] The V-shaped opening is symmetrical about the vertical plane passing through its center line. At the same time, it is also necessary to ensure that the two V-shaped supports 2 are parallel to ensure that the center line of the connecting rod 3 and the middle rod 11 are collinear, so as to ensure the accuracy of subsequent sample measurement.

[0028] This embodiment has two V-shaped brackets 2. During use, the V-shaped openings of both V-shaped brackets 2 are first placed across the middle rod 11. Because the two V-shaped brackets 2 are parallel and fixed to each other, the V-shaped openings are symmetrical about the vertical plane passing through their center lines. When the inner sidewalls of the V-shaped openings of both V-shaped brackets 2 are in contact with the sidewalls of the middle rod 11, it can be considered that the middle rod 11 and the connecting rod 3 share the same center line.

[0029] At this time, move the sliding pad 4 to fit the outer end face of the base plate with the end face of the end head 12, and screw the nut on the threaded rod to fix the sliding pad 4 and the connecting rod 3.

[0030] At the same time, the measuring plate 5 should pass through the through hole 13 of the end head 12 from the end face of the end head 12, and the distance between the side of the measuring plate 5 and the through hole 13 should be measured with a ruler or vernier caliper to obtain the positional deviation between the center point of the through hole 13 and the center line of the middle rod 11.

[0031] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0032] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A tie rod accuracy detection assembly for railway freight cars, applicable to the center tie rod of a railway freight car bogie, said center tie rod comprising: The middle rod and the end heads fixed at both ends of the middle rod, the end heads are provided with opening slots, and the end heads are provided with two through holes that pass through the opening slots. The railway freight car tie rod accuracy detection component is characterized in that it includes: The V-shaped bracket is a vertically arranged plate with an inverted V-shaped opening at the lower end and a movable groove at the upper end, wherein the movable groove and the inverted V-shaped opening share the same center line. A connecting rod, wherein the connecting rod is a straight rod, the cross section of the connecting rod is adapted to the movable groove, the connecting rod is movably inserted into the movable grooves of at least two V-shaped brackets, and a threaded rod is fixed on each of the two vertical sides of the connecting rod; A sliding pad, comprising a base plate and two vertical plates fixed to the base plate, the two vertical plates being parallel to each other, each of the two vertical plates being provided with an elongated slot, the connecting rod being movably disposed between the two vertical plates, and each threaded rod being inserted into the elongated slot; A measuring plate, which is a straight plate, is fixed to the end of the connecting rod. The vertical side of the measuring plate is at a fixed and known distance from the center line of the movable groove.

2. The railway freight car tie rod accuracy detection component according to claim 1, characterized in that, The length of the measuring plate is not less than the distance between the center points of the two through holes on the end.

3. The railway freight car tie rod accuracy detection component according to claim 2, characterized in that, The connecting rod has a trapezoidal cross-section, and the movable groove of the V-shaped bracket is a dovetail groove structure adapted to the cross-section of the connecting rod.

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