Airtight and lettering composite tool for connecting pipe of exhaust system of commercial vehicle

Abstract

The utility model relates to an airtight and lettering composite tool for a connecting pipe of an exhaust system of a commercial vehicle, which is characterized in that the airtight and lettering composite tool comprises a base arranged on a rack and a workpiece supporting seat fixedly arranged on the base, the workpiece supporting seat is provided with an annular O-shaped sealing ring, a first positioning pin and a second positioning pin, and the first positioning pin and the second positioning pin are arranged diagonally; an O-shaped sealing ring is arranged on the base, a negative pressure hole is formed in an annular area of the O-shaped sealing ring, the negative pressure hole is connected with a negative pressure pipeline and a negative pressure pump, a plurality of air cylinders used for pressing and fixing a workpiece are arranged on the base, and a character carving machine located between the two air cylinders and used for carving characters on the side face of the workpiece is further arranged on the base. The airtight and lettering composite tool for the connecting pipe of the exhaust system of the commercial vehicle is simple in structure and reasonable in design, and airtight detection and marking on the same tool are facilitated.

Description

Technical field:

[0002] The utility model relates to an airtight and lettering composite tooling for a connecting pipe of an exhaust system of a commercial vehicle. Background technology:

[0004] The connecting pipe of the exhaust system of commercial vehicles needs to be tested for its air tightness. Products that pass the air tightness test will be marked or labeled, and unqualified products will not be marked or labeled. The air tightness testing and marking or labeling of the products require two processes, which need to be performed by two sets of tooling and two operators, thereby increasing the production cost and production cycle. In addition, the workpiece needs to be transferred and stored during the air tightness testing and marking or labeling processes, which also adds intermediate steps, resulting in low production efficiency and high production costs.

[0005] In addition, since the two end ports of the tubular workpiece need to be sealed during air tightness testing, the air tightness components at both ends were not installed properly in the past, making replacement more troublesome.

[0006] For example, the Chinese patent "An intake manifold air tightness detection and positioning component", publication number CN220454794U, includes an air tightness detection base, a telescopic rod is fixed on the upper end of the air tightness detection base, a first pneumatic cylinder is installed on the upper end of the air tightness detection base, a first piston rod is connected to the upper end of the first pneumatic cylinder, a positioning platform is fixed to the upper end of the first piston rod, the upper end of the positioning platform is connected to the intake manifold, a cylinder hole is arranged on the left side of the intake manifold, and a throttle hole is arranged on the back of the intake manifold. Although the intake manifold air tightness detection and positioning component is provided with a first slide rail on the large movable plate, and the movable rod can be used to position and adjust the circular sealing head group according to the position of the cylinder hole group, it is impossible to realize air tightness detection and marking (or engraving) on ​​the same tooling. Summary of the invention:

[0008] In view of the above-mentioned problems, the purpose of the utility model is to propose an airtight and engraved composite tooling for a commercial vehicle exhaust system connecting pipe. The airtight and engraved composite tooling for a commercial vehicle exhaust system connecting pipe has a simple structure and a reasonable design, which is conducive to realizing airtightness detection and marking on the same tooling.

[0009] The utility model is an airtight and lettering composite tooling for a commercial vehicle exhaust system connecting pipe, which is characterized by comprising a base arranged on a frame and a workpiece support seat fixed on the base, the workpiece support seat is provided with an annular O-ring and two first and second locating pins arranged diagonally, a negative pressure hole is provided in the annular area of ​​the O-ring, the negative pressure hole is connected to a negative pressure pipeline and a negative pressure pump, a plurality of cylinders for pressing and fixing the workpiece are provided on the base, and a lettering machine located between the two cylinders for lettering on the side of the workpiece is also provided on the base.

[0010] Preferably, the workpiece support seat comprises two parallel and oppositely arranged bottom plates and a rectangular top plate fixedly mounted on the bottom plates, and the first locating pin, the second locating pin, the O-ring and the negative pressure hole are arranged on the rectangular top plate.

[0011] Preferably, the cylinders include a first cylinder, a second cylinder, a third cylinder and a fourth cylinder, wherein the first cylinder and the second cylinder are arranged on bases on opposite sides of the rectangular top plate, and the third cylinder and the fourth cylinder are arranged on bases on other opposite sides of the rectangular top plate.

[0012] Preferably, a support column is fixedly provided on each cylinder body, the upper end of the support column is hinged to the middle position of the pressure arm, the tail of the pressure arm is hinged to the free end of the telescopic rod of the cylinder, and the front part of the pressure arm is used to press on the surface of the workpiece.

[0013] Preferably, a rubber pressing block is provided on the front portion of the pressing arm connected to the fourth cylinder, and the rubber pressing block is used to press the port at the upper end of the workpiece.

[0014] Preferably, a compression spring is provided between the rubber pressure block and the front portion of the pressure arm connected to the fourth cylinder to play a buffering role.

[0015] Preferably, a through hole is provided at the front portion of the pressure arm connected to the fourth cylinder, a screw is passed through the through hole, the upper end of the screw passes through the through hole and is locked with a nut, the lower end of the screw passes through the through hole and is fixedly connected to the stepped shaft, the lower end of the stepped shaft has a spherical head, the upper end of the rubber pressure block is provided with a groove for embedding the spherical head, the compression spring is sleeved on the stepped shaft, and a bolt that can be threadedly connected to the spherical head is passed through the center of the rubber pressure block from bottom to top.

[0016] The utility model discloses a method for using the airtight and lettering composite tooling for connecting pipes of exhaust systems of commercial vehicles. The workpiece is placed on a workpiece support seat, a first positioning pin and a second positioning pin are matched with positioning holes on the workpiece, and then a plurality of cylinders are actuated to press and fix the workpiece, and then a negative pressure pump starts to work, and an air pressure detector is installed in series on the negative pressure pipeline. When the air pressure value detected by the air pressure detector can be maintained within the set value range of the negative pressure pump air extraction, the airtightness of the workpiece is qualified, and then the lettering machine starts to work to letter the side of the workpiece.

[0017] The utility model has a simple structure and a reasonable design for the airtightness and lettering composite tooling for connecting pipes of an exhaust system of a commercial vehicle, and is conducive to realizing airtightness detection and marking on the same tooling. Description of the drawings:

[0019] The utility model is further described below in conjunction with the accompanying drawings;

[0020] Figure 1 It is a three-dimensional diagram of the utility model;

[0021] Figure 2 It is a three-dimensional diagram of the utility model with workpieces omitted;

[0022] Figure 3 is a schematic diagram of the connection structure between the first cylinder and the pressure arm;

[0023] Figure 4 is a schematic diagram of the connection structure between the pressure arm connected to the fourth cylinder and the rubber pressure block;

[0024] Figure 5 It is a working principle diagram of the connection between the negative pressure pipeline, the negative pressure detector and the negative pressure pump. Specific implementation method:

[0026] The utility model is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0027] The utility model provides an airtight and lettering composite tooling for connecting pipes of exhaust systems of commercial vehicles, comprising a base 1 arranged on a frame and a workpiece support seat 2 fixedly arranged on the base, wherein the base is a flat plate, and the workpiece support seat 2 comprises two parallel and oppositely arranged bottom plates 201 and a rectangular top plate 202 fixedly installed on the bottom plates.

[0028] The workpiece support seat 2 is provided with an annular O-ring 3 and two diagonally arranged first locating pins 4 and a second locating pin 5. A negative pressure hole 6 is provided in the annular area of ​​the O-ring 3. The negative pressure hole 6 is connected to a negative pressure pipeline 7 and a negative pressure pump 8. A negative pressure detector 9 (which is an existing commercially available component and is not described here) is connected in series to the negative pressure pipeline 7. A plurality of cylinders for pressing and fixing the workpiece are provided on the base 1. The first locating pin 4, the second locating pin 5, the O-ring 3 and the negative pressure hole 6 are arranged on the rectangular top plate 202.

[0029] The base 1 is also provided with a plotter 10 located between the two cylinders for marking the side of the workpiece. After the negative pressure sealing test, the qualified workpiece can be marked and engraved by the plotter.

[0030] Specifically, the above-mentioned cylinders include a first cylinder 11, a second cylinder 12, a third cylinder 13 and a fourth cylinder 14, wherein the first cylinder 11 and the second cylinder 12 are arranged on bases on opposite sides of the rectangular top plate, and the third cylinder 13 and the fourth cylinder 14 are arranged on bases on other opposite sides of the rectangular top plate 202. Each cylinder can be directly pressed on the surface of the workpiece at the output end, but it is more reasonable to achieve the pressing through the following mechanism to facilitate the removal and placement of the workpiece.

[0031] A support column 15 is fixedly provided on the cylinder body of each cylinder (the support column is a square column with a U-shaped groove at its upper end, or the support column is a square column with connecting plates installed on both sides of its upper part to form a U shape, and the U-shaped groove or the U-shape is designed to accommodate the middle part of the pressing arm 16). The upper end of the support column is hinged to the middle position of the pressing arm 16, and the tail of the pressing arm is hinged to the free end of the telescopic rod 17 of the cylinder (the cylinder is vertically arranged, and the telescopic rod 17 is telescoped upward). The front part of the pressing arm is used to press on the surface of the workpiece K. When the telescopic rod of the cylinder rises, the tail part of the pressing arm 16 rises, and the front part of the pressing arm 16 descends and is pressed on the surface of the workpiece K.

[0032] In order to achieve sealing, a rubber pressure block 18 is provided on the front part of the pressure arm connected to the fourth cylinder. The rubber pressure block is used to press the port at the upper end of the workpiece (i.e. the pipe opening of the exhaust system connecting pipe to achieve sealing of the pipe opening).

[0033] For better buffering, a compression spring 19 is provided between the rubber pressure block and the front part of the pressure arm connected to the fourth cylinder to play a buffering role.

[0034] In order to improve the stability of the pressing, a through hole 20 is provided at the front of the pressing arm 16 connected to the fourth cylinder 14, and a screw 21 is passed through the through hole 20. The upper end of the screw 21 passes through the through hole and is locked with a nut 22. The lower end of the screw 21 passes through the through hole and is fixedly connected to a stepped shaft 23. The lower end of the stepped shaft 23 has a spherical head 24. The upper end of the rubber pressing block is provided with a sink groove 25 for embedding the spherical head. The compression spring 19 is sleeved on the stepped shaft. Due to the cooperation between the spherical head 24 and the sink groove 25, as well as the compression spring 19, the rubber pressing block can have a certain swing, so that the pipe mouth of the workpiece can be better used. A bolt 26 that can be threadedly connected to the spherical head is passed through the center of the rubber pressing block from bottom to top.

[0035] The utility model discloses a method for using the airtight and lettering composite tooling for connecting pipes of exhaust systems of commercial vehicles. The workpiece is placed on a workpiece support seat, a first positioning pin and a second positioning pin are matched with positioning holes on the workpiece, and then a plurality of cylinders are actuated to press and fix the workpiece, and then a negative pressure pump starts to work, and an air pressure detector is installed in series on the negative pressure pipeline. When the air pressure value detected by the air pressure detector can be maintained within the set value range of the negative pressure pump air extraction, the airtightness of the workpiece is qualified, and then the lettering machine starts to work to letter the side of the workpiece.

[0036] The utility model has a simple structure and a reasonable design for the airtightness and lettering composite tooling for connecting pipes of an exhaust system of a commercial vehicle, and is conducive to realizing airtightness detection and marking on the same tooling.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the utility model can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the utility model, which should be included in the scope of the technical solution for protection of the utility model.

Claims

1. A commercial vehicle exhaust system connecting pipe airtight and lettering composite tooling, characterized by: It includes a base arranged on a frame and a workpiece support seat fixed on the base, the workpiece support seat is provided with an annular O-ring and two diagonally arranged first locating pins and a second locating pin, a negative pressure hole is provided in the annular area of ​​the O-ring, the negative pressure hole is connected to a negative pressure pipeline and a negative pressure pump, a plurality of cylinders for pressing and fixing the workpiece are provided on the base, and a plotter located between the two cylinders and used for engraving the side of the workpiece is also provided on the base.

2. The commercial vehicle exhaust system connecting pipe airtight and lettering composite tooling according to claim 1 is characterized by: The workpiece support seat comprises two parallel and oppositely arranged bottom plates and a rectangular top plate fixedly mounted on the bottom plates, and the first positioning pin, the second positioning pin, the O-ring and the negative pressure hole are arranged on the rectangular top plate.

3. The commercial vehicle exhaust system connecting pipe airtight and lettering composite tooling according to claim 2 is characterized by: The cylinders include a first cylinder, a second cylinder, a third cylinder and a fourth cylinder, wherein the first cylinder and the second cylinder are arranged on bases on opposite sides of a rectangular top plate, and the third cylinder and the fourth cylinder are arranged on bases on another opposite side of the rectangular top plate.

4. The commercial vehicle exhaust system connecting pipe airtight and lettering composite tooling according to claim 3 is characterized by: A support column is fixed on each cylinder body, the upper end of the support column is hinged to the middle position of the pressure arm, the tail of the pressure arm is hinged to the free end of the telescopic rod of the cylinder, and the front part of the pressure arm is used to press on the surface of the workpiece.

5. The commercial vehicle exhaust system connecting pipe airtight and lettering composite tooling according to claim 4 is characterized by: A rubber pressing block is provided on the front part of the pressing arm connected to the fourth cylinder, and the rubber pressing block is used for pressing the port at the upper end of the workpiece.

6. The commercial vehicle exhaust system connecting pipe airtight and lettering composite tooling according to claim 5 is characterized by: A compression spring is arranged between the rubber pressure block and the front part of the pressure arm connected to the fourth cylinder to play a buffering role.

7. The commercial vehicle exhaust system connecting pipe airtight and lettering composite tooling according to claim 6 is characterized by: A through hole is provided at the front part of the pressure arm connected to the fourth cylinder, a screw is passed through the through hole, the upper end of the screw passes through the through hole and is locked with a nut, the lower end of the screw passes through the through hole and is fixedly connected to the stepped shaft, the lower end of the stepped shaft has a spherical head, the upper end of the rubber pressure block is provided with a groove for embedding the spherical head, the compression spring is sleeved on the stepped shaft, and a bolt that can be threadedly connected to the spherical head is passed through the center of the rubber pressure block from bottom to top.

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