JPH05153B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides a method for clamping both rails in a correct relative positional relationship when their end surfaces are brought into pressure contact with each other, and a method for carrying out the method. This invention relates to a clamp device. [Prior Art] The joining condition of a joint obtained by press-welding a pair of rails with their end surfaces, that is, the state of the joint, such as the left and right deviation of the joint, the occurrence of a step on the top surface, and the straightness, is determined by the following: It has a great effect on ride comfort, running stability, noise level, etc., and particularly high precision is required for the joints of the rails of rail cars that run at high speeds. Defects in rail joints are caused by the manufacturing accuracy of the rail itself or the accuracy of the rail clamp before welding. Therefore, when clamping the rail before welding, the manufacturing accuracy of the rail, especially the bending of the rail, must be checked. It is necessary to absorb the error and align the rails to be joined in the correct relative positional relationship. An example of a conventional clamping method and device for clamping rails together during this type of rail pressure welding is disclosed in Japanese Patent Application Laid-open No. 1986-56, for example.
-Disclosed in Publication No. 136292. However, in this conventional clamping method, both rails are clamped in the vertical and horizontal directions simultaneously using a single hydraulic cylinder device via a link mechanism. The hydraulic cylinder device must be operated after correcting both the vertical and horizontal positions of the comrades, and in particular, the horizontal position correction work requires the worker to crawl under the pressure welding device. A pair of clamp jaws, which are fixed to the clamp device with bolts, must be replaced in order to adjust the left and right positions, and an adjustment system (spacer) must be inserted, which is a work to check the straightness of both rails. Since this process is repeated several times, it usually takes about 10 minutes to properly clamp both rails in a straight line.The subsequent pressure welding process itself only takes a few minutes, so most of the time is spent clamping both rails together. This resulted in the inconvenience of having to spend time correcting the position of the vehicle. [Problems to be Solved by the Invention] An object of the present invention is to provide a rail clamping method that eliminates the above-mentioned disadvantages of the prior art, and in particular can easily and quickly perform vertical and horizontal positioning of rails. The purpose is to provide equipment. [Means for Solving the Problems] In the present invention, the above-mentioned problem is solved by making it possible to operate the clamps at the ends of each rail independently of the vertical positioning clamp mechanism as the first step and the clamp mechanism for vertical positioning as the first step. This is accomplished by dividing the positioning into two parts, including a second step, which is a lateral positioning clamp mechanism. That is, the method of the present invention is a method of clamping both rails in a correct relative positional relationship when the end surfaces of the rails are brought into pressure contact with each other; a first step of first positioning the ends in the vertical direction, and then clamping both rail ends with separate clamping means on the rail abdomen with a gap on both sides of the abutting end surface. a second step of pinching and clamping from both sides in the thickness direction of the rail abdomen, and in the first step, both rail ends are pushed upward by the jaws under the rail head. The top surface of each rail is pressed against the lower surface of the leveler 21 which provides a pre-adjusted reference level, and in the second step, the rail belly is pre-adjusted by a relatively strong force from one side of the rail belly. The above-mentioned problem is achieved by pushing the rail abdomen to a reference position, and then pushing the rail abdomen in a counter direction from the other side of the rail abdomen with a weaker force. Further, the device of the present invention is a device that clamps both rails in a correct relative positional relationship when the end surfaces of the rails are pressed against each other, and the device approaches and separates from each other only in one direction corresponding to the length direction of the rails. and a pair of clamp heads spaced apart from each other on both sides of the abutting end surfaces of the rails for clamping the ends of the rails, respectively; The clamp heads 1a and 1b each have a leveler 21 whose position can be adjusted to provide a reference level in the vertical direction on its lower surface.
and hydraulic devices 23a and 23b that push up the rail by coming into contact with the jaws on both sides under the rail head,
a first clamping means that comes into contact with one side of the rail belly and pushes the rail belly to a pre-adjusted stroke end reference position; and a first clamp means that comes into contact with the other side of the rail belly and opposes the first clamping means. and second clamping means for pressing the rail belly with a weaker force. In one preferred embodiment, a lower surface of the leveler and a contact surface with the rail jaw portion of the hydraulic device are made of a low-friction surface. In yet another preferred embodiment, both the first and second clamping means include a hydraulic cylinder arrangement and a clamping jaw attached to the tip of its piston rod, in which case the first clamping means constitutes The hydraulic cylinder device is preferably adjustable in position at its stroke end; in particular, a hydraulic cylinder device with a fixed stroke length and adjustable in position is preferably used as the hydraulic cylinder device. . [Operation] According to the present invention, both rail end portions are first positioned in the vertical direction with a space provided on both sides of the abutting end surface portion. To this end, both rail ends are pushed upward by the jaws under the rail head, and the upper surface of each rail is pressed against the lower surface of the leveler which provides a pre-adjusted reference level. Then, both rail ends are clamped by being pinched from both sides of the rail belly.
In this case, one side of the rail belly pushes the rail belly to a pre-adjusted reference position with a relatively strong force, and the other side pushes the rail belly in the opposite direction with a weaker force. push. In the present invention, the straightness of both rails in the vertical direction can be made to a desired accuracy by adjusting the reference level given by the lower surface of each leveler at the end of both rails before clamping. In addition, the straightness of both rails in the left and right direction can be similarly achieved to the desired accuracy by adjusting the reference position given by the end of the pressing stroke from one side at the end of both rails before clamping. can. As described above, the apparatus for carrying out the present invention is provided with a pair of clamp heads for clamping both rail ends, respectively, with a space between them with the abutting end surface in between. The clamp heads can move toward and away from each other only in one direction corresponding to the length of the rail. Both clamp heads have a position-adjustable leveler that provides a reference level in the vertical direction on the bottom surface, a hydraulic device that presses the rail upward by contacting the jaws on both sides under the rail head, and a hydraulic device that presses the rail upward by contacting the jaws on both sides under the rail head. a first clamping means that abuts a side surface and pushes the rail belly to a pre-adjusted reference position of the stroke end; and a first clamping means that abuts the other side of the rail belly and opposes and is weaker than the first clamping means. and second clamping means for pressing the rail belly with force. When the lower surface of the leveler and the contact surface of the hydraulic device with the rail jaw portion are made of low-friction surfaces, the hydraulic device can move the rail that is in contact with the leveler in the left-right direction without significantly reducing its pushing up force. It can be moved minutely and slightly slid against the rail, making adjustment work easier. In another preferred embodiment, the clamping means include a hydraulic cylinder arrangement and a clamping jaw attached to the distal end of the piston rod. The hydraulic cylinder device constituting the first clamping means is adjustable in position at its stroke end,
This can be achieved in particular, for example, by mounting the hydraulic cylinder arrangement itself with a fixed stroke length in an adjustable manner. The foregoing and other features and advantages of the present invention include:
It will become clearer from the following description of a non-limiting example with the aid of a drawing. [Example] Figures 1 to 3 schematically show a rail clamp device according to an example of the present invention. In these figures, a pair of rails 5a and 5b are in contact with each other at their end surfaces, and a pair of straddle-type clamp heads 1a and 1b having almost the same configuration are placed between the abutting end surfaces 5c. Clamp their ends across each rail. One clamp head 1a is on the movable side, and the other clamp head 1b is on the fixed side. The fixed clamp head 1b is fixed to one end of each of a plurality of guide bars 2 oriented in the longitudinal direction of the rail, and the other ends of these guide bars are fixed to the frame 3. The movable clamp head 1a is guided and supported by the guide bar 2 between the fixed clamp head 1b and the frame 3, and the movable clamp head 1a is supported by a cylinder device 4 attached to the frame 3.
can approach and move away from the stationary side clamp head 1b for pressure welding work. still,
6a and 6b are hanging pieces for hanging the entire clamp device with a crane. Since the constructions of both clamp heads are almost the same, the construction of only one clamp head 1a will be explained below. The clamp head 1a includes a vertical positioning clamp mechanism 20 that operates as a first step, and horizontal positioning clamp mechanisms 30, 30 that operate as a subsequent second step. There are two sets of horizontal positioning clamp mechanisms 30, 30, and these mechanisms 20, 30, 30 are arranged in a line in the length direction of the rail with the vertical positioning mechanism 20 in between, as shown in FIG. As shown in FIG. 2, the vertical positioning mechanism 20 includes a leveler 21 fixed to the lower surface of the center of the straddle space 7 of the head 1a so as to be vertically adjustable, and a leveler 21 that is pivotally supported on both sides of the straddle space 7. It has push-up rotating metal fittings 22a, 22b, and hydraulic cylinder devices 23a, 23b that rotate these metal fittings symmetrically. The two metal fittings 22a, 22b are rotated by the extension operation of the piston rods of the hydraulic cylinder devices 23a, 23b, and push up the jaws under the head of the rail 5a from below to the top, thereby raising the top surface of the rail head to the leveler 21. Press it against the bottom surface of the In this case, the lower surface of the leveler 21 is preferably finished with a surface that does not cause too much friction against the top surface of the rail, and the contact portions of the metal fittings 22a and 22b with the rail jaws can also slide slightly with respect to the rail. Finished with a low friction surface. The left-right positioning clamp mechanism 30 includes hydraulic cylinder devices 31a and 31b installed on both sides of the straddle space 7 of the head 1a, as shown in FIG.
and clamp jaws 32a, 32b attached to the tips of the piston rods of these hydraulic cylinder devices 31a, 31b. Each clamp jaw clamps the abdomen of the rail from both sides without slipping with its tip. Here, one first clamping means is composed of 31a, 32a, 33a, and 34a, and the hydraulic cylinder device 31a is, for example, 40×
It has an output of 10 ³ Kgf/cm ² , and at the end of its extension stroke, the clamp jaw 32a provides a reference for the left and right position of the rail. To adjust this reference position,
The hydraulic cylinder device 31a is fixed to the head 1a so that its position can be adjusted. The other second clamping means consists of 31b, 32b, 33b, and 34b, and the hydraulic cylinder device 31b has a relatively low output;
For example, it has an output of 35×10 ³ Kgf/cm ² . In the illustrated example, both hydraulic cylinder devices 31a, 3
1b is a cylindrical cavity 33 formed in the head 1a.
a, 33b, and are fixed to the head 1a by bolts 34a, 34b at the flanges at the tail end of each. Said one hydraulic cylinder device 31a
The position adjustment can be carried out, for example, by using a headed bolt as the bolt 34a that fixes the flange of the cylinder 31a to the head 1a, and adjusting the screwing amount of this bolt. Now, in order to clamp both rails for rail pressure contact using the clamp device having the above configuration, first, the levels of the levelers 21 of both clamp heads 1a and 1b are made the same, and the bolts 34a By adjusting both clamp heads 1
The stroke end position of the hydraulic cylinder devices 31a of a and 1b is set by clamping the jaw 3 with both heads.
The positions are adjusted so that the positions of the tip surfaces of 2a coincide with each other. Thereafter, the clamp heads 1a, 1b are placed over the ends of the rails 5a, 5b, which are arranged with their end surfaces in contact with each other, with their end surface abutting portions 5c in between (see Fig. 1). ). Next, the cylinder device 23 of the vertical positioning mechanism 20 in both heads
a, 23b are extended to rotate the metal fittings 22a, 22b, and the tips of the metal fittings push up the jaws under the heads of the rails 5a, 5b from below, and the rails 5a, 5
Press each top of the head (b) onto the corresponding leveler 21 (FIG. 2). As a result, both rails 5a,
The vertical linearity of 5b is ensured. While maintaining this pressed state, the two sets of hydraulic cylinder devices 31a and 31 on both sides of the rails of both clamp heads 1a and 1b are then extended, and when the clamp jaws 32a and 32b are used to clamp each abdomen of both rails from both sides, Since the output of the hydraulic cylinder device 31a on one side of the rail is larger than the output of the hydraulic cylinder device 31b on the other side, the hydraulic cylinder device 31a extends to its stroke end and brings the abdominal surface of one side of the rail to the reference position,
As a result, the linearity of both rails in the left-right direction is ensured, and at the same time, they are hydraulically clamped from the opposite side by another hydraulic cylinder device 31b.
In this case, if each output of the hydraulic cylinder devices 31a and 31b is as illustrated above, the clamp output is 35×10 ³ Kgf/cm ² .
If the left and right positions of both rails 5a and 5b are misaligned, the position of the hydraulic cylinder device 31a of one of the heads is finely adjusted using the bolt 34a. This fine adjustment work can be easily done from the side of the rail within a short time. [Effects of the Invention] As described above, according to the present invention, it is easy to make fine adjustments in the left and right directions of the rail during actual work, so that the adjustment time and number of adjustments can be significantly reduced compared to the conventional method. The following table shows the adjustment time and number of adjustments in rail clamping work using the conventional method and the method of the present invention.
and the correction time required to ensure linearity.As is clear from this table, when using the method of the present invention, the correction time can be reduced to about 1/5 compared to the conventional method, and the work It was confirmed that this method has a significant effect on improving efficiency. 【table】

[Brief explanation of the drawing]

FIG. 1 is a side view showing a rail clamp device according to an embodiment of the present invention, and FIG. 2 is a view showing a vertical positioning clamp mechanism that operates as a first step, and a cross-sectional view taken along the line -- in FIG. It is. FIG. 3 is a diagram showing the left-right positioning clamp mechanism that operates as the second step, and is a cross-sectional view taken along the line -- in FIG. 1. In the figures, the same symbols indicate the same or equivalent parts,
1a and 1b are clamp heads, 2 is a guide bar,
3 is a frame, 4 is a cylinder device, 5a, 5b are rails, 5c is a contact end surface, 6a, 6b are hanging pieces, 7 is a straddle space, 20 is a vertical positioning mechanism,
21 is a leveler, 22a, 22b are push-up rotation fittings, 23a, 23b are hydraulic cylinder devices, 30
31a, 31b are hydraulic cylinder devices, 32a, 32b are cavities, 34
a and 34b are bolts.

Claims (1)

[Claims] 1. A method for clamping both rails 5a and 5b in a correct relative positional relationship when their end surfaces are brought into pressure contact with each other; a first step of first positioning the end of the rail in the vertical direction, and then clamping both ends of the rail with separate clamping means at a distance on both sides with the abutting end surface in between; a second step of pinching and clamping the rail from both sides in the direction of the abdominal thickness on both sides of the abdomen; The top surface of each rail is pressed against the lower surface of the leveler 21 which provides a pre-adjusted reference level by being pushed up, and in the second step, the rail abdomen is pressed with a relatively strong force from one side of the rail abdomen. A method for clamping a rail, characterized in that the rail abdomen is pushed to a pre-adjusted reference position, and the rail belly is pushed in an opposing direction from the other side of the rail belly with a weaker force. 2 A device that clamps both rails in the correct relative positional relationship when their end surfaces are pressed against each other, and that can approach and separate from each other only in one direction corresponding to the length direction of the rails, and that In a rail clamp device equipped with a pair of clamp heads for clamping both rail ends, respectively, with a space between them on both sides with the abutting end surface in between; A leveler 21 whose position can be adjusted to provide a level on its lower surface, and hydraulic devices 23a and 2 which press the rail upward by contacting the jaws on both sides under the rail head.
3b, a first clamp means that comes into contact with one side of the rail abdomen and presses the rail abdomen to a pre-adjusted reference position of a stroke end, and the first clamp means that comes into contact with the other side of the rail belly. and second clamping means for pushing the rail belly with a weaker force in opposition to the rail clamping device. 3. The rail clamping device according to claim 2, wherein the lower surface of the leveler 21 and the contact surfaces with the rail jaws of the hydraulic devices 23a, 23b are made of low friction surfaces. 4. According to claim 2, both the first and second clamping means include hydraulic cylinder devices 31a, 31b and clamping jaws 32a, 32b attached to the tips of their piston rods. rail clamping device. 5. The rail clamping device according to claim 4, wherein the hydraulic cylinder devices 31a and 31b constituting the first clamping means are adjustable in position at their stroke ends. 6 A hydraulic cylinder device 2 with a fixed stroke length in which the hydraulic cylinder devices 23a and 23b constituting the first clamping means are mounted so that their positions can be adjusted.
6. The rail clamping device according to claim 5, wherein the rail clamping device is 0.