CN114000421A

CN114000421A - Scissors link mechanism for beam end telescoping device

Info

Publication number: CN114000421A
Application number: CN202110998785.6A
Authority: CN
Inventors: 史龙波; 刘强; 陈飞; 职涛; 闫宇青
Original assignee: China Railway Baoji Bridge Group Co Ltd
Current assignee: China Railway Baoji Bridge Group Co Ltd
Priority date: 2021-08-28
Filing date: 2021-08-28
Publication date: 2022-02-01

Abstract

The invention relates to a method for improving the stability of a beam seam when the beam seam is in a large level, when the steel rail telescopic device is vertically rotated, when the beam end is rotated by more than 10 per mill, the whole scissor fork mechanism cannot be deformed and blocked, and can also be stretched along with the steel rail telescopic device, a bolt is inserted into the middle superposed hole of two long connecting rods to form an X scissor movable arm, the bolt hinged part of the X scissor movable arm is connected with an installation base A4, two arm heads on the left side of the X scissor movable arm are respectively hinged with one end of a left short connecting rod, the other ends of the two left short connecting rods are superposed and hinged through a bolt B and connected with the installation base A, the right arm head of the X movable arm is respectively hinged with one end of a right short connecting rod, the other ends of the two right short connecting rods are superposed and hinged with the other end of a joint iron to form a horizontal rotation pair, and one end of the joint iron is connected with the installation base B to form a vertical rotation pair.

Description

Scissors link mechanism for beam end telescoping device

Technical Field

The invention relates to a scissors link mechanism for a beam end telescopic device, which can not only prevent the whole scissors fork mechanism from deformation and blockage when a beam joint has a large horizontal and vertical corner and the beam end has a corner more than 10 per mill.

Background

CN208250913U, name "pillow device is lifted with scissors fork to beam-ends", including last scissor arm subassembly and lower scissor arm subassembly, go up scissor arm subassembly with lower scissor arm subassembly articulates and forms a plurality of hinge point units, its characterized in that, every the hinge point unit all includes: the pin shaft is in a step shape and comprises a clamping section, a connecting section and a thread section which are arranged from bottom to top along the vertical direction, the upper scissor arm assembly and the lower scissor arm assembly are sleeved on the connecting section, and the upper scissor arm assembly can rotate relative to the lower scissor arm assembly; the pin shaft adjusting gasket is sleeved on the threaded section and clamped with the clamping step, and the upper surface of the pin shaft adjusting gasket is positioned on the upper side of the upper surface of the upper scissor arm assembly; the fastening assembly is matched with the threaded section, the lower surface of the fastening assembly is abutted against the upper surface of the pin shaft adjusting washer, and a gap is formed between the lower surface of the fastening assembly and the upper surface of the upper scissor arm assembly. The method has the following defects: firstly, this patent is applicable to one-way flexible beam-ends telescoping device, and the roof beam seam is located between fixed bearing 1 and the 3 bases of movable support. When the width of the beam seam changes, the movable support 2 and the movable support 3 are driven to move, and the whole scissors fork is driven to stretch; secondly, the scissors fork can only be suitable for bridges with small expansion amount of the width of the beam gap, and the expansion amount is generally not more than +/-400 mm; thirdly, the scissors fork can only be suitable for the bridge to stretch out and draw back towards a single direction, when a larger corner (more than 10 per thousand) occurs at the beam end, the whole scissors fork mechanism can deform and block, so that the smoothness of the top surface of a steel rail is poor, and the driving safety of a train is endangered; thirdly, the long connecting rod and the short connecting rod are directly connected, or a flat washer is added in the middle, so that the friction force is large during rotation, and jamming is easy to occur; fourthly, each revolute pair is directly connected with the pin shaft, and a shaft sleeve is not arranged, so that the overall strength is low; fifthly, the scissors linkage mechanism can only be suitable for the expansion of a bridge beam seam in a single direction, when the corners of the beam ends of the bridge seam are oversized, the long connecting rod and the short connecting rod are easily distorted, and the whole scissors linkage mechanism is easily blocked.

Disclosure of Invention

The design purpose is as follows: the reinforced scissors link mechanism suitable for the beam end expansion device is designed, can expand and contract along with a steel rail expansion piece, meets the requirements of corner deformation of the beam end in the horizontal and vertical directions, and is flexible in rotation and small in friction force; when a beam seam has larger horizontal and vertical corners and the corner of the beam end is more than 10 per mill, the whole scissor fork mechanism cannot deform and block and can stretch along with a steel rail expansion piece, the requirements of the horizontal and vertical corner deformation of the beam end are met, the rotation is flexible, the friction is small, and the running safety of a train is ensured.

The design scheme is as follows: in order to achieve the above design objectives. In order to ensure the continuity, safety and stability of the railway track structure at the long-span steel bridge seam, a beam end expansion device needs to be arranged at the beam seam according to the design requirements of a bridge, and the beam end expansion device is matched with a steel rail expansion device. On the basis of the background technology, the invention changes the working principle of the background technology and is suitable for a bidirectional telescopic beam end telescopic device, the scissors link mechanisms are required to be used on two sides of a fixed transition plate in pairs, and beam seams are positioned below the fixed transition plate and between hinged supports 4. When the width of the beam gap changes, the driving steel sleeper and the driven steel sleeper are driven to move, so that the scissors link mechanisms on the two sides are driven to stretch, and the position of the middle transition plate is relatively unchanged. Design adaptable beam seam width variation +/-800 mm's bridge on application condition, adopt two-way rotation hinged-support, when great level, vertical corner take place for the beam seam for when the fixed many directions of cab apron nonparallel of initiative steel sleeper, driven sleeper and sequence number, all can adjust through hinged-support, constantly keep the ride comfort of rail top surface, and then guarantee train driving safety.

The technical scheme is as follows: the utility model provides a two long connecting rods middle part stack trompils insert the bolt and constitute X scissors digging arm and X scissors digging arm's bolt articulated portion and be connected with installation base A4, two arm heads in the left side of X scissors digging arm are articulated with left part short connecting rod one end respectively, two short connecting rod other end stacks of left part are articulated through bolt B and are connected with installation base A, the right side arm head of X digging arm is articulated with right part short connecting rod one end respectively, two short connecting rod other ends stacks of right part and connects the iron other end and articulate and form the horizontal direction revolute pair, connect and be connected between iron one end and the installation base B and form vertical direction revolute pair.

Compared with the prior art, the invention has the advantages that firstly, the scissors link mechanism is originally connected with the fixed transition plate by the bidirectional hinge support, the horizontal and vertical rotation angles of the oversized beam end at the beam joint can be adapted, and the whole mechanism is flexible to rotate and is not easy to block; the driven steel sleeper is connected with the connecting rod mounting base through a bolt and freely moves along with the extension of the connecting rod, the connecting rod foundation can be prevented from upwarping, and the extension stability of the whole mechanism is ensured; thirdly, the friction surface of the connecting rod and the connecting rod is provided with an ultra-high molecular weight polyethylene small-resistance anti-friction washer, so that the rotating friction force of the connecting rod joint can be reduced to the greatest extent, and the strength is reliable; fourthly, connecting holes of the connecting rod joint and connecting holes of the base B are provided with high-strength shaft sleeves, so that the shearing stress from the bolt or the base pin shaft can be resisted to the greatest extent.

Drawings

FIG. 1 is a top view of a scissor linkage for a beam end telescoping device.

Fig. 2 is a partial schematic view of fig. 1.

Fig. 3 is a side view schematic of fig. 2.

Fig. 4 is a three-dimensional model diagram of the scissors linkage mechanism in fig. 1, for explaining the configuration of the present invention.

Fig. 5 is a background art schematic.

Detailed Description

Example 1: reference is made to figures 1-3 of the drawings. The utility model provides a 6 middle part stack trompils of two long connecting rods insert the bolt and constitute X scissors digging arm and the bolt articulated portion of X scissors digging arm is connected with installation base A4, two arm heads in the left side of X scissors digging arm are articulated with 5 one ends of the short connecting rod in left part respectively, 5 other ends stack of the short connecting rod in two left parts are articulated and are connected with installation base A4 through bolt B13, the right side arm head of X digging arm is articulated with 5 one end of the short connecting rod in right part respectively, 5 other ends stack of the short connecting rod in two right parts form the horizontal direction revolute pair with the articulated other end that connects iron 8, connect between 8 one end of joint iron and the installation base B7 and form vertical direction revolute pair.

The other end of the joint iron A8 and the two right short connecting rods 5 are connected through a bolt B13, a slotted nut 17, a cotter pin 18, an antifriction washer 19 and a flat washer 20 to form a horizontal direction rotation pair. One end of the joint iron 8 is connected with the mounting base B7 through a bolt A12, a slotted nut 17, a cotter pin 18 and a flat washer 20 to form a vertical rotation pair.

The joints of the short connecting rod 5 and the long connecting rod 6 are in interference fit with the shaft sleeve C11 to form a reinforced revolute pair.

The driving steel sleeper 1 is connected with the bridge deck through concrete pouring and moves along with the expansion of the beam gap bridge deck; 2 installation bases A4 are respectively fixed on the driving steel sleeper 1 and the driven steel sleeper 2 through bolts D15, common nuts 16, rubber mats 21 and spring washers 22, the rubber mats 21 and the installation bases 4 are arranged between the lower surfaces and the top surfaces of the steel sleepers, the driven steel sleepers 2 are arranged on the bridge deck without any connection, the bridge deck provides a supporting plane for the sliding of the driven steel sleepers, and the installation bases B7 are directly welded on the upper surface of the transition plate 3 to form a whole.

The lower part of the driving steel sleeper 1 is connected with the bridge, and the upper part of the driving steel sleeper 1 is connected with a connecting rod mounting base A4 through a bolt.

The driven steel sleeper 2 is connected with the connecting rod mounting base A4 through a bolt and freely moves along with the extension and contraction of the connecting rod.

The joint of the connecting rod is connected through a mounting base or a bolt pair, and a small-resistance anti-friction washer is arranged on the friction surface of the connecting rod and the connecting rod.

The connecting rod joint connecting hole is provided with a high-strength shaft sleeve.

The driving steel sleeper 1 is connected with the bridge deck through concrete pouring and moves along with the expansion of the beam gap bridge deck.

The installation bases A4 are 2 pieces, and are respectively installed and fixed on the driving steel sleeper 1 and the driven steel sleeper 2 through bolts D15, common nuts 16, rubber pads 21 and spring washers 22, and the rubber pads 21 and the installation bases 4 are arranged between the lower surfaces of the pads and the top surfaces of the steel sleepers.

The driven steel sleeper 2 is positioned on the bridge deck without any connection, and the bridge deck provides a supporting plane for the sliding of the driven steel sleeper.

The mounting base B7 is welded directly to the upper surface of the transition plate 3, forming an integral part therewith.

Interference fit is respectively formed between the connecting hole of the mounting base B7 and the outer surface of the shaft sleeve B10 and between the connecting hole of the joint iron 8 and the outer surface of the shaft sleeve A9.

One end of the joint iron 8 is connected with the mounting base B7 through a bolt A12, a slotted nut 17, a cotter 18 and a flat washer 20 to form a vertical direction rotation pair, and the other end of the joint iron A8 is connected with the two short connecting rods 5 through a bolt B13, a slotted nut 17, a cotter 18, an antifriction washer 19 and a flat washer 20 to form a horizontal direction rotation pair.

It is to be understood that: although the foregoing embodiments have described the design concept of the present invention in detail, these descriptions are only used for describing the design concept of the present invention in brief, and not for limiting the design concept of the present invention, and any combination, addition or modification that does not exceed the design concept of the present invention falls within the scope of the present invention.

Claims

1. The utility model provides a scissors link mechanism for beam-ends telescoping device which characterized by: two long connecting rod (6) middle parts stack trompils insert the bolt and constitute X scissors digging arm and X scissors digging arm's bolt articulated portion and installation base A (4) are connected, two arm heads in the left side of X scissors digging arm are articulated with left part short connecting rod (5) one end respectively, two short connecting rod (5) other end stacks and pass through bolt B (13) articulated and be connected with installation base A (4), the right side arm head of X digging arm is articulated with right part short connecting rod (5) one end respectively, two short connecting rod (5) other ends stacks and articulate with joint iron (8) other end and form the horizontal direction revolute pair, connect and be connected between iron (8) one end and the installation base B (7) and form vertical direction revolute pair.

2. The scissors linkage for a beam-end retractor of claim 1 wherein: the other end of the joint iron A (8) is connected with the two right short connecting rods (5) through a bolt B (13), a slotted nut (17), a cotter pin (18), an antifriction washer (19) and a flat washer (20) to form a horizontal rotating pair.

3. The scissors linkage for a beam-end retractor of claim 1 wherein: one end of the joint iron (8) is connected with the mounting base B (7) through a bolt A (12), a slotted nut (17), a cotter pin (18) and a flat washer (20) to form a vertical direction rotating pair.

4. The scissors linkage for a beam-end retractor of claim 1 wherein: the joints of the short connecting rod (5) and the long connecting rod (6) are in interference fit with the shaft sleeve C (11) to form a reinforced revolute pair.

5. The scissors linkage for a beam-end retractor of claim 1 wherein: the driving steel sleeper (1) is connected with the bridge deck through concrete pouring and moves along with the expansion of the beam gap bridge deck; two installation base A (4) are through bolt D (15), nut (16), cushion (21), spring washer (22) are installed respectively and are fixed in initiative steel pillow (1), driven steel pillow (2), between cushion (21) pad and installation base (4) lower surface and the steel pillow top surface, driven steel pillow (2) are located on the decking, do not do any connection, the decking provides the holding surface for the slip of driven steel pillow, installation base B (7) lug weld in cab apron (3) upper surface, constitute a whole rather than.

6. The scissors linkage for a beam-end retractor of claim 5 wherein: the lower part of the active steel sleeper (1) is connected with the bridge, and the upper part is connected with the connecting rod mounting base A (4) through a bolt.

7. The scissors linkage for a beam-end retractor of claim 5 wherein: the driven steel sleeper (2) is connected with the connecting rod installation base A (4) through a bolt and freely moves along with the extension of the connecting rod.

8. The scissors linkage for a beam-end retractor of claim 1 wherein: the joint of the connecting rod is connected through a mounting base or a bolt pair, and a small-resistance anti-friction washer is arranged on the friction surface of the connecting rod and the connecting rod.

9. The scissors linkage for a beam-end retractor of claim 1 wherein: the connecting rod joint connecting hole is provided with a high-strength shaft sleeve.