A milling clamping fixture for socket-type longitudinal joint connectors of tunnel segments

Abstract

A milling clamping fixture for socket-type longitudinal seam connectors of tunnel segments, comprising a fixed plate, a first side plate and a second side plate connected in parallel on both sides of the fixed plate, and a movable plate rotatably connected to the first side plate; a reference rod is provided on the side of the fixed plate facing the movable plate, the upper surface of the reference rod is flush with the upper surfaces of the fixed plate, the first side plate and the second side plate, and the reference rod is arranged parallel to the first side plate and the second side plate; the shape of the reference rod matches the internal shape of the workpiece to be processed, the reference rod is inserted into the workpiece to be processed and abuts against it, and the movable plate rotates and abuts against the second side plate to complete the clamping of the workpiece to be processed. The present invention provides stable clamping during milling, improves production efficiency, reduces labor intensity, and ensures product processing accuracy and production safety.

Description

Technical Field

[0001] The invention belongs to the field of tunnel construction parts processing, and in particular relates to a milling clamping jig for socket-and-spigot type longitudinal seam connectors of tunnel segments. Background Art

[0002] With the rapid development of urban rail transit (subway), rail transit has become an important part of urban transportation and the first choice for the general public to travel. It is of great significance to promote market prosperity and the rapid development of society and economy. Tunnel engineering is an important carrier of subway transportation, among which the connection method of shield tunnel segments is the top priority in the tunnel construction process.

[0003] The currently used bolt connection method has the problems of many connection points between the annular seam and the longitudinal seam during segment assembly, inclined force direction, small force area, narrow operating space, and all manual operations. Not only is the labor intensity high and the work efficiency low, but it is also easy to damage the segments, posing safety hazards, resulting in many leakage points, difficulty in ensuring quality, frequent diseases in the later stage, and high maintenance costs.

[0004] The new type of pipe segment splicing adopts socket connection, which does not require bolt connection. The end of the pipe segment adopts composite water-stop material, which has the characteristics of better integrity, stronger rigidity, longer durability and better waterproofness.

[0005] In order to machine a surface that meets the specified technical requirements on a certain part of the workpiece, various devices are generally used to accurately, conveniently and reliably install the workpiece on the machine tool according to the structural shape of the workpiece, the processing method and the production batch, and then process it. This device used to install the workpiece to determine the relative position of the workpiece and the cutting tool and clamp the workpiece is called a "machine tool fixture".

[0006] In the process of producing the socket-type longitudinal joints of the tunnel segments, fixtures are used in almost every process. Obviously, if fixtures are not used, not only will the machining accuracy of the workpiece be difficult to ensure, but the machining productivity will also be greatly reduced, and sometimes even the machining will be impossible.

[0007] Under current circumstances, factories use universal fixtures, which often cannot meet the needs of various parts processing, or make temporary modifications to universal fixtures, which cannot guarantee product quality. The modified fixtures are easily damaged and deformed during use, resulting in frequent interruptions of the processing process, causing product damage, increasing production costs and production cycles, and even posing safety hazards.

[0008] At the same time, for workpieces with complex structures and high positioning accuracy requirements, it is often difficult to achieve the accuracy requirements when using general fixtures for processing. Summary of the invention

[0009] The purpose of the present invention is to provide a milling clamping jig for a socket-and-spigot type longitudinal seam connector of a tunnel segment, so as to solve the technical problem of ensuring machining accuracy and stable production of the socket-and-spigot type longitudinal seam connector of a tunnel segment during the milling process.

[0010] To achieve the above-mentioned purpose, the specific technical solution of the milling clamping fixture of the socket-type longitudinal seam connector of the tunnel segment of the present invention is as follows:

[0011] A milling clamping fixture for socket-type longitudinal seam connectors of tunnel segments comprises a fixed plate, a first side plate and a second side plate connected in parallel on both sides of the fixed plate, and a movable plate rotatably connected to the first side plate; a reference rod is provided on the side of the fixed plate facing the movable plate, the upper surface of the reference rod is flush with the upper surfaces of the fixed plate, the first side plate and the second side plate, and the reference rod is arranged parallel to the first side plate and the second side plate; the shape of the reference rod matches the internal shape of the workpiece to be processed, the reference rod is inserted into the workpiece to be processed and abuts against it, and the movable plate rotates to abut against the second side plate to complete the clamping of the workpiece to be processed.

[0012] In order to more accurately position the workpiece to be processed, the reference rod includes a rectangular guide structure, a first reference positioning bevel and a second reference positioning bevel extending from the guide structure on both sides, and a supporting structure connecting the first reference positioning bevel and the second reference positioning bevel.

[0013] In order to further accurately position the workpiece to be processed, the first reference positioning bevel and the second reference positioning bevel have an included angle of 100°-170° with the guide structure, and the support structure is in an arc shape.

[0014] In order to better position the workpiece to be processed in the horizontal direction, the fixed plate is provided with a positioning block on the same side of the reference rod, which cooperates with the movable plate to clamp the workpiece to be processed.

[0015] Furthermore, there are two positioning blocks, which are mirror-distributed on both sides of the reference rod.

[0016] In order to keep the clamping fixture closed during milling, an extrusion wheel is provided on the outer side of the movable plate relative to the reference rod, and an external force is applied to the extrusion wheel to keep the movable plate in contact with the second side plate.

[0017] In order to ensure the neatness of the milling process, slots are provided on the side of the first side plate to facilitate the cleaning of chips.

[0018] In order to achieve normal operation when the size of the workpiece to be processed is slightly different or the specifications are different, the movable plate is provided with a through hole, and the bolt passes through the through hole to clamp the workpiece to be processed.

[0019] Beneficial effects:

[0020] The milling and clamping jig for the socket-and-spigot type longitudinal seam connector of the tunnel segment provided by the present invention ensures the accuracy of the processing position of the workpiece to be processed, shortens the working process, thereby improving production efficiency, ensuring production quality, reducing labor intensity, and thus ensuring production safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of a milling clamping fixture for a socket-and-spigot type longitudinal seam connector of a tunnel segment of the present invention;

[0022] Figure 2 It is a front view of a milling clamping jig of a socket-and-spigot type longitudinal seam connector of a tunnel segment of the present invention;

[0023] Figure 3 The left diagram is a milling and clamping jig for the socket-and-spigot type longitudinal seam connector of a tunnel segment of the present invention;

[0024] Figure 4 This is a schematic diagram of the milling clamping fixture and the workpiece to be processed for the socket-type longitudinal joint connection of the tunnel segment;

[0025] Figure 5 A schematic diagram of a milling and clamping fixture for the workpiece to be processed to enter the socket-type longitudinal joint connection of the tunnel segment;

[0026] Explanation of the markings in the figure: 100, fixed plate; 200, first side plate; 300, second side plate; 400, movable plate; 500, reference rod; 101, positioning block; 201, slot; 401, extrusion wheel; 402, through hole; 501, guide structure; 502, first reference positioning inclined plane; 503, second reference positioning inclined plane; 504, supporting structure; 600, workpiece to be processed. DETAILED DESCRIPTION

[0027] In order to better understand the purpose, structure and function of the present invention, the following is a further detailed description of a milling clamping fixture for a socket-type longitudinal seam connector of a tunnel segment of the present invention in conjunction with the accompanying drawings.

[0028] Implementation example:

[0029] like Figure 1-5 As shown, the milling clamping fixture of the socket-type longitudinal seam connector of the tunnel segment of the present invention includes a fixed plate 100, a first side plate 200 and a second side plate 300 connected in parallel on both sides of the fixed plate 100, and a movable plate 400 rotatably connected to the first side plate 200, and the first side plate 200 and the second side plate 300 perform the first clamping on the workpiece 600.

[0030] A reference rod 500 is provided on one side of the fixed plate 100 facing the movable plate 400 . The upper surface of the reference rod 500 is flush with the upper surfaces of the fixed plate 100 , the first side plate 200 and the second side plate 300 . The reference rod 500 is arranged parallel to the first side plate 300 and the second side plate 400 .

[0031] The reference rod 500 includes a rectangular guide structure 501, a first reference positioning inclined surface 502 and a second reference positioning inclined surface 503 extending from both sides of the guide structure 501, and a support structure 504 connecting the first reference positioning inclined surface 502 and the second reference positioning inclined surface 503. The angle between the first reference positioning inclined surface 502 and the second reference positioning inclined surface 503 and the guide structure 501 is 100°-170°, and the support structure 504 is in an arc shape.

[0032] The shape of the reference rod 500 matches the internal shape of the workpiece 600 to be processed. The workpiece 600 enters the clamping fixture through the guide structure 501. The first reference positioning bevel 502 and the second reference positioning bevel 503 match the internal bevel of the inside of the workpiece 600 to complete the positioning of the workpiece and the machine tool in two directions.

[0033] The weight of the workpiece 600 itself and the first reference positioning inclined surface 502 and the second reference positioning inclined surface 503 complete the second clamping of the workpiece.

[0034] The fixed plate 100 is provided with two positioning blocks 101 on the same side as the reference rod 500, which are mirror-distributed on both sides of the reference rod 500. After the movable plate 400 rotates and abuts against the second side plate 300, the clamping fixture is closed to complete the third clamping of the workpiece 600, and the horizontal positioning of the workpiece and the machine tool is also completed.

[0035] An extrusion wheel 401 is provided on the outer side of the movable plate 400 relative to the reference rod 500. By applying external force to the extrusion wheel 401, the movable plate 400 is kept in contact with the second side plate 300. The extrusion wheel 401 provides a certain buffer, and will not cause damage to the clamping fixture and the workpiece 600 to be processed due to excessive external force, thereby maintaining continuous production.

[0036] A large amount of chips will be generated during the milling process, which need to be cleaned at any time during the production process. If the cleaning is not thorough, it will lead to hidden dangers in product quality. The side of the first side plate 200 is provided with a slot 201 to facilitate the cleaning of chips.

[0037] The sizes of the workpieces 600 to be processed in each batch may be slightly different. In this case, the workpieces 600 to be processed can be adjusted by passing bolts through the through holes 402 provided on the movable plate 400 to ensure that the workpieces 600 to be processed are clamped.

[0038] When using, Figure 5As shown, the milling clamping fixture of the socket-type longitudinal seam connector of the tunnel segment is installed and fixed on the worktable of the milling machine. Corresponding to the position of the milling cutter, the concave groove of the workpiece 600 to be processed is inserted into the reference rod 500 until it abuts against the positioning block 101, so that the first reference positioning inclined surface 502 and the second reference positioning inclined surface 503 extending from the guide structure of the reference rod 500 on both sides are matched with the angle inside the groove to be processed, the movable plate 400 is rotated to the position of the second side plate 300, the adjustment bolt is adjusted to adjust the gap, the lock nut is locked, and the cylinder running speed and pressure are adjusted. The piston rod of the air source air switch cylinder is turned on to move forward, and the pressing cone inclined surface pushes the extrusion wheel 401 to drive the adjusting bolt head on the movable plate 400 to press the workpiece to be processed. The milling cutter mills the upper surface of the workpiece 600 to make the workpiece 600 to be processed and the upper surface of the clamping fixture flush. After completing the processing of the workpiece to be processed, the air source switch cylinder is rotated back to loosen the workpiece, and the movable plate 400 is opened to take out the processed workpiece.

[0039] It is to be understood that the present invention is described by some embodiments, and it is known to those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A milling and clamping fixture for socket-type longitudinal joint connectors of tunnel segments, characterized in that: It includes a fixed plate, a first side plate and a second side plate connected in parallel to both sides of the fixed plate, and a movable plate rotatably connected to the first side plate; a reference rod is provided on one side of the fixed plate facing the movable plate, the upper surface of the reference rod is flush with the upper surfaces of the fixed plate, the first side plate and the second side plate, and the reference rod is arranged in parallel with the first side plate and the second side plate; The shape of the reference rod matches the internal shape of the workpiece to be processed, the reference rod is inserted into the workpiece to be processed and abuts against it, and the movable plate rotates and abuts against the second side plate to complete the clamping of the workpiece to be processed; The reference rod comprises a rectangular guide structure, a first reference positioning inclined surface and a second reference positioning inclined surface extending from both sides of the guide structure, and a supporting structure connecting the first reference positioning inclined surface and the second reference positioning inclined surface; The same side of the fixed plate where the reference rod is provided is provided with a plurality of positioning blocks, which cooperate with the movable plate to clamp the workpiece to be processed; The movable plate is provided with an extrusion wheel on the outer side relative to the reference rod, and the movable plate is kept in contact with the second side plate by applying external force to the extrusion wheel.

2. The milling and clamping jig for the socket-and-spigot type longitudinal joint connector of a tunnel segment according to claim 1 is characterized in that: The first reference positioning inclined plane and the second reference positioning inclined plane have an included angle of 100°-170° with the guide structure, and the support structure is in an arc shape.

3. The milling and clamping jig for the socket-and-spigot type longitudinal joint connector of a tunnel segment according to claim 1 is characterized in that: There are two positioning blocks, which are mirror-distributed on both sides of the reference rod.

4. The milling and clamping jig for the socket-and-spigot type longitudinal joint connector of a tunnel segment according to claim 1 is characterized in that: The side surface of the first side plate is provided with slots to facilitate cleaning of chips.

5. The milling and clamping jig for the socket-and-spigot type longitudinal joint connector of a tunnel segment according to claim 1 is characterized in that: The movable plate is provided with a through hole, and bolts pass through the through hole to clamp the workpiece to be processed.

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