Dotting clamp for detecting brinell hardness of steel rail welded joint

Abstract

The utility model discloses a dotting clamp for detecting the Brinell hardness of a steel rail welded joint, which belongs to the technical field of hardness detection and comprises a clamping frame capable of being attached to and buckled on a steel rail head, a dotting window is arranged on the clamping frame, two positioning rods are connected in the dotting window in a sliding manner, and dotting through holes are formed in the positioning rods; wherein a plurality of clamping grooves are formed in the edges of the two sides of the point drawing window respectively, and clamping blocks capable of being connected with the clamping grooves in a clamped mode are arranged on the positioning rods. The tool is suitable for drawing points on a cutting plane when a steel rail welded joint is subjected to Brinell hardness detection, and can achieve the effect of quickly assisting an operator to draw solid dots on the cutting plane.

Description

Technical Field

[0001] The utility model relates to the technical field of hardness detection, in particular to a dot-marking fixture for detecting the Brinell hardness of a rail welding joint. Background Art

[0002] The performance of rails is one of the main factors affecting the running speed of high-speed railways, and the hardness of rails is an important parameter affecting the performance of rails. When performing Brinell hardness testing on rail welded joints, it is necessary to cut a plane on the rail surface and draw multiple solid dots symmetrically and evenly on the plane to ensure the accuracy of the Brinell hardness test.

[0003] In the prior art, a steel ruler is generally used as a tool to draw points, which is not only slow but also prone to errors. Therefore, there is an urgent need for a dotting fixture for testing the Brinell hardness of rail welded joints that can quickly assist operators in drawing solid dots on the cut rail surface. Utility Model Content

[0004] The utility model aims to provide a dot-marking fixture for testing the Brinell hardness of a rail welded joint, which enables an operator to quickly and evenly draw a plurality of solid dots on the cutting plane on the rail head through a dot-marking through hole by means of a positioning rod which can slide horizontally above the cutting plane and can be fixed at a preset position.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a dot-marking fixture for testing the Brinell hardness of a rail welded joint, comprising a card frame that can be attached and buckled on the rail head, the card frame is provided with a dot-marking window, two positioning rods are slidably connected in the dot-marking window, and the positioning rods are provided with dot-marking through holes;

[0006] Wherein, a plurality of card slots are respectively arranged on the edges of both sides of the drawing point window, and a card block capable of being engaged with the card slots is arranged on the positioning rod.

[0007] In a preferred embodiment of the present invention, the distance between the plurality of card slots on the same side of the dot drawing window is 15 mm, and the projection of each card slot on the same side of the dot drawing window on the other side is located between two card slots.

[0008] In a preferred embodiment of the utility model, a plurality of positioning screws capable of abutting against two sides of the rail head are threadedly connected to the clamping frame, and one end of the positioning screw abutting against the rail head is semi-spherical.

[0009] In a preferred embodiment of the utility model, the clamping block is slidably embedded in the positioning rod, and a spring capable of driving the end of the clamping block to engage with the clamping groove is embedded in the positioning rod.

[0010] In a preferred embodiment of the utility model, the clamping block is provided with a circular through hole, and a limiting bolt which can be threadedly connected with the positioning rod is movably penetrated in the circular through hole.

[0011] In a preferred embodiment of the utility model, two ends of the spring are respectively embedded in the columnar grooves on the clamping block and the positioning rod, and a round head column is movably penetrated in the circle of the spring.

[0012] In a preferred embodiment of the utility model, the drawing point through hole is funnel-shaped.

[0013] In a preferred embodiment of the utility model, a group of parallel and symmetrical limiting slide grooves are arranged inside the drawing point window, and the positioning rod is provided with limiting ribs that can be slidably embedded in the limiting slide grooves.

[0014] In a preferred embodiment of the utility model, the positioning rod and the clamping block are respectively provided with magnets for magnetic attraction.

[0015] In a preferred embodiment of the utility model, a pull ring is provided on the clamping block.

[0016] The beneficial effects of the utility model are as follows: the clamping frame is directly buckled on the rail head, and the clamping frame is fixed on the rail head by tightening the positioning screw. And through the positioning rod that can slide horizontally above the cutting plane and can be fixed at a preset position, each fixed landing point of the drawing tool on the cutting plane through the drawing hole can correspond to the point position of the required drawing point, so that the operator can quickly draw multiple solid dots symmetrically and evenly on the cutting plane on the rail head. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0018] Figure 1 It is a structural schematic diagram of a preferred embodiment of the utility model when the dot-marking fixture is buckled on the rail head;

[0019] Figure 2 It is a structural schematic diagram of a dotting fixture in a preferred embodiment of the utility model;

[0020] Figure 3 In the preferred embodiment of the utility model Figure 2 A schematic diagram of the local enlarged structure at B;

[0021] Figure 4 It is a schematic cross-sectional view of the structure when the positioning rod and the clamping block are assembled together in the first preferred embodiment of the utility model;

[0022] Figure 5This is a schematic diagram of the structure when the positioning rod and the clamping block are assembled together in the second preferred embodiment of the utility model;

[0023] Among them, 1. card frame; 101. drawing point window; 1011. card slot; 1012. limiting slide slot; 2. positioning rod; 201. drawing point through hole; 202. limiting rib; 3. card block; 301. circular through hole; 4. positioning screw; 5. spring; 6. limiting bolt; 7. cylindrical groove; 8. round head column; 9. magnet; 10. pull ring. DETAILED DESCRIPTION

[0024] The present invention will now be further described in detail in conjunction with the accompanying drawings and embodiments. These drawings are simplified schematic diagrams that only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0025] It should be noted that if there are directional indications (such as up, down, bottom, top, etc.) involved in this embodiment, the directional indication is only used to explain the relative position relationship, movement, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly. The terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. Unless otherwise clearly specified and defined, the terms "set", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances. Embodiment 1

[0026] like Figure 1-Figure 4 As shown, a dot-marking fixture for testing the Brinell hardness of a rail welded joint comprises a card frame 1 that can be attached and buckled onto the rail head, the card frame 1 is provided with a dot-marking window 101, two positioning rods 2 are slidably connected in the dot-marking window 101, and the positioning rods 2 are provided with dot-marking through holes 201; wherein, a plurality of card slots 1011 are respectively provided on the two side edges of the dot-marking window 101, and a card block 3 that can be snapped with the card slot 1011 is provided on the positioning rod 2.

[0027] Specifically, when in use, the card frame 1 is directly buckled onto the rail head. Since the size of the rail head is fixed, the card frame 1 is buckled onto one side of the rail head to be contoured so as to fit the rail head and ensure its stability when buckled onto the rail head. Through the dot drawing window 101 on the card frame 1, the cutting plane on the rail surface can be directly visually viewed. When the positioning rod 2 slides to a certain position in the dot drawing window 101, the card block 3 thereon is engaged with the card slot 1011 to locate and fix the position of the positioning rod 2. The operator only needs to use the dot drawing tool to draw points on the cutting plane through the dot drawing through hole 201. The dot marking fixture in the present technical solution is easy to operate and can quickly draw points on the cutting plane on the rail head.

[0028] As mentioned above, since the size of the rail head is fixed, the distance between the plurality of slots 1011 on the same side of the dot drawing window 101 is 15 mm, and the projection of each slot 1011 on the same side of the dot drawing window 101 on the other side is located between the two slots 1011. That is, the slots 1011 on both sides of the dot drawing window 101 are staggered, and the blocks 3 on the two positioning rods 2 can correspond to the slots 1011 on the same side respectively. When the blocks 3 on the two positioning rods 2 are engaged with the slots 1011, the shortest distance between the two positioning rods 2 is 7.5 mm. By adjusting the position of the positioning rod 2, evenly spaced points can be drawn on the cutting plane through the dot drawing through holes 201 on the positioning rod 2.

[0029] Further, such as Figure 1 , Figure 2 As shown, the clamping frame 1 is threadedly connected with a plurality of positioning screws 4 that can abut against both sides of the rail head, and one end of the positioning screw 4 that abuts against the rail head is semi-spherical. After the clamping frame 1 is buckled onto the rail head, the positioning screw 4 can be tightened so that one end of the positioning screw 4 abuts against both sides of the rail head, thereby fixing the position of the clamping frame 1 on the rail and increasing the accuracy of the hardness detection point. As mentioned above, since both sides of the rail surface are arc-shaped, when the semi-spherical end of the positioning screw 4 abuts against the rail, the contact area is smaller, the force is more concentrated, and the fixing effect is better.

[0030] The above, such as Figure 2 , Figure 3 , Figure 4As shown, the block 3 is slidably embedded in the positioning rod 2, and the positioning rod 2 is embedded with a spring 5 that can drive the end of the block 3 to engage with the slot 1011. The block 3 can engage with the slot 1011 under the elastic support of the spring 5, which is convenient for the operator to operate. Further, the block 3 is provided with a circular through hole 301, and a limit bolt 6 that can be threadedly connected to the positioning rod 2 is movably penetrated in the circular through hole 301. The limit bolt 6 cooperates with the circular through hole 301 to limit the block 3 on the positioning rod 2 to prevent the block 3 from detaching from the positioning rod 2. In this technical solution, the two ends of the spring 5 are respectively embedded in the cylindrical grooves 7 on the block 3 and the positioning rod 2, and a round head column 8 is movably penetrated in the circle of the spring 5. Both ends of the round head column 8 are semi-spherical. When the block 3 slides on the positioning rod 2, the spring 5 will be compressed, and the cylindrical head column can support the circle of the spring 5 when it is compressed to prevent the spring 5 from bending and deforming as a whole.

[0031] Further, such as Figure 4 As shown, the dot-drawing through hole 201 is funnel-shaped, which facilitates guiding the dot-drawing tool to pass through the dot-drawing through hole 201 .

[0032] In this embodiment, if Figure 3 , Figure 4 As shown, a set of parallel and symmetrical limiting slide grooves 1012 are provided inside the plotting window 101, and the positioning rod 2 is provided with limiting ribs 202 that can be slidably embedded in the limiting slide grooves 1012. The limiting ribs 202 and the limiting slide grooves 1012 are both linear, so that when the positioning rod 2 slides, its two ends can slide synchronously to ensure that the points drawn on the cutting plane through the plotting through hole 201 are on the same straight line. Embodiment 2

[0033] like Figure 5 As shown, different from the dot punching fixture for testing the Brinell hardness of rail welded joints in the first embodiment, the positioning rod 2 and the clamping block 3 are respectively provided with magnets 9 for magnetic attraction, and when the clamping block 3 is engaged with the clamping slot 1011, the positioning rod 2 and the clamping block 3 are magnetically fixed by the magnet 9. Different from using the spring 5 to engage the clamping block 3 with the clamping slot 1011, this structure is simpler.

[0034] Further, a pull ring 10 is provided on the clamping block 3, so that the operator can remove the clamping block 3 from the positioning rod 2. It is also convenient to connect the clamping block 3 with the positioning rod 2 by using a rope or the like to prevent the clamping block 3 from being lost.

[0035] Working principle: When in use, the card frame 1 is directly buckled on the rail head, and the card frame 1 is fixed on the rail head by tightening the positioning screw 4. At this time, the positioning rod 2 slides horizontally above the cutting plane. When the positioning rod 2 is fixed at the specified position through the clamping block 3 and the vertical clamping slot 1011, the operator only needs to use the dot drawing tool through the dot drawing through hole 201 to draw points on the cutting plane. The dot marking fixture in this technical solution is easy to operate and can quickly draw multiple solid dots symmetrically and evenly on the cutting plane on the rail head.

[0036] The above is based on the ideal embodiment of the utility model. Through the above description, relevant personnel can make various changes and modifications without deviating from the technical concept of the utility model. The technical scope of this utility model is not limited to the content in the specification, and the technical scope must be determined according to the scope of the claims.

Claims

1. A point-marking fixture for testing the Brinell hardness of rail welded joints, characterized in that: It comprises a card frame (1) that can be attached to and buckled onto the rail head of a steel rail, the card frame (1) is provided with a dot plotting window (101), two positioning rods (2) are slidably connected in the dot plotting window (101), and the positioning rods (2) are provided with dot plotting through holes (201); Wherein, a plurality of card slots (1011) are respectively arranged on the edges of both sides of the plotting point window (101), and a card block (3) capable of being carded with the card slots (1011) is arranged on the positioning rod (2).

2. The point-marking fixture for testing Brinell hardness of rail welded joints according to claim 1, characterized in that: The distance between a plurality of the card slots (1011) on the same side of the dot plotting window (101) is 15 mm, and the projection of each of the card slots (1011) on the same side of the dot plotting window (101) on the other side is located between two of the card slots (1011).

3. The point-marking fixture for testing Brinell hardness of rail welded joints according to claim 1, characterized in that: The clamping frame (1) is threadedly connected with a plurality of positioning screws (4) capable of abutting against two sides of the rail head, and one end of the positioning screws (4) abutting against the rail head is semi-spherical.

4. The dot-marking fixture for testing Brinell hardness of rail welded joints according to claim 1, characterized in that: The clamping block (3) is slidably embedded in the positioning rod (2), and a spring (5) capable of driving the end of the clamping block (3) to engage with the clamping groove (1011) is embedded in the positioning rod (2).

5. The spot punching fixture for testing Brinell hardness of rail welded joints according to claim 4, characterized in that: The clamping block (3) is provided with a circular through hole (301), and a limiting bolt (6) capable of being threadedly connected to the positioning rod (2) is movably penetrated in the circular through hole (301).

6. The dot-marking fixture for testing Brinell hardness of rail welded joints according to claim 4, characterized in that: The two ends of the spring (5) are respectively embedded in the cylindrical grooves (7) on the clamping block (3) and the positioning rod (2), and a round head column (8) is movably provided in the circle of the spring (5).

7. The dot-marking fixture for testing Brinell hardness of rail welded joints according to claim 1, characterized in that: The drawing point through hole (201) is funnel-shaped.

8. The spot punching fixture for testing Brinell hardness of rail welded joints according to claim 1, characterized in that: A group of parallel and symmetrically arranged limiting slide grooves (1012) are arranged inside the plotting window (101), and a limiting rib (202) capable of being slidably embedded in the limiting slide grooves (1012) is arranged on the positioning rod (2).

9. The dot-marking fixture for testing Brinell hardness of rail welded joints according to claim 1, characterized in that: The positioning rod (2) and the clamping block (3) are respectively provided with magnets (9) for magnetic attraction.

10. The dot-marking fixture for testing Brinell hardness of rail welded joints according to claim 9, characterized in that: A pull ring (10) is provided on the clamping block (3).

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