Press fitting and riveting system for oil sprayer bush

Abstract

The utility model discloses a press fitting and riveting system for a bushing of an oil sprayer. The press fitting and riveting system comprises a feeding unit, a loading unit, a pre-mounting unit and a press fitting unit, wherein the feeding unit adopts an annular feeding conveying line, and a lining is placed on the annular feeding conveying line; the feeding unit adopts a mechanical arm, and a clamping jaw is installed on the mechanical arm and used for grabbing a lining and placing the lining into an oil sprayer lining bottom hole of an air cylinder cover. The pre-mounting unit comprises a positioning device for positioning the cylinder cover; the press-fitting unit comprises a press-fitting press and a riveting press which are respectively used for press-fitting and riveting the bushings; according to the utility model, all the assembly units are utilized to work efficiently and cooperatively, and the use of high-automation, high-precision and intelligent equipment in the whole assembly process reduces the use conditions of low efficiency and high energy consumption caused by manual assembly and hydraulic press fitting.

Description

Technical Field

[0001] The utility model belongs to the technical field of fuel injector bushing installation, and particularly relates to a fuel injector bushing press-fitting and riveting system. Background Technique

[0002] The statements herein only provide the background technique related to the utility model, and do not necessarily constitute the prior art.

[0003] The fuel injector is a very important component in modern engines. Its function is to control the fuel injection volume and injection time, so as to ensure the normal operation of the engine. The fuel injector will accurately control the fuel injection volume according to parameters such as the working state, load and speed of the engine, make it match the intake air volume, and achieve the best combustion effect.

[0004] The fuel injector is usually installed on the cylinder head through a bushing. Therefore, before installing the fuel injector, the bushing should be first pressed into the fuel injector hole on the cylinder head, and then the fuel injector is installed in the fuel injector hole. When pressing the fuel injector bushing into the fuel injector hole on the cylinder head, a fuel injector press-fitting tool is usually required. For example, Chinese Utility Model Patent CN215393620U discloses a fuel injector bushing press-fitting tool for cylinder head, including a guide sleeve, an extrusion head and a press-fitting punch rod. The using method of this device is as follows: move the cylinder head to the pre-installation station, and the operator sequentially places 6 fuel injector bushings in the bottom holes of the fuel injector bushings on the cylinder head, and then uses the above-mentioned press-fitting tool to pre-press the bushings. The above-mentioned press-fitting tooling requires manual operation of the press-fitting process, and there are the following problems: manual pre-press-fitting of the bushings results in slow assembly efficiency, and the problem of misplacement and omission of bushings is likely to occur in high-frequency repetitive work, and the assembly quality cannot be guaranteed.

[0005] In addition, in the prior art, a hydraulic cylinder is also used to realize the press-fitting of the fuel injector bushing. Although this method does not require manual operation, there are also the following problems: (1) When the hydraulic cylinder press-fits and encounters load changes and resistance, hydraulic pressure fluctuations will occur, resulting in deformation of the bushing during press-fitting and burrs in riveting; (2) The operation and maintenance cost of the hydraulic system is high, the energy efficiency is low, and at the same time, there is an environmental pollution problem caused by oil leakage; (3) The hydraulic system cannot achieve effective process monitoring, and cannot respond in time to stop the equipment failure during the press-fitting process. For example, when the hydraulic cylinder retracts on-site, it will drag the cylinder head out of the station. Content of the Utility Model

[0006] The purpose of the utility model is to provide a fuel injector bushing press-fitting and riveting system, which can realize the efficient, quality-guaranteed, rapid press-fitting and riveting of the fuel injector bushing, and then realize the full automation of the production process flow, reduce the production cost, and improve the product quality stability.

[0007] In order to achieve the above purpose, the utility model is realized by the following technical solutions:

[0008] In a first aspect, an embodiment of the present utility model provides an injector bushing press-fitting and riveting system, which is characterized by comprising a feeding unit, a loading unit, a pre-installation unit and a press-fitting unit; wherein, the feeding unit adopts an annular feeding conveyor line, and a bushing tray is placed on the annular feeding conveyor line for placing bushings; the loading unit adopts a manipulator, and a gripper is installed on the manipulator for grasping the bushing and placing the bushing into the bottom hole of the injector bushing of the cylinder head; the pre-installation unit includes a pre-installation station for positioning the cylinder head; the press-fitting unit includes a press-fitting press and a riveting press for press-fitting and riveting the bushing respectively.

[0009] As a further technical solution, bushing positioning pins are arranged on the bushing tray of the annular conveyor line in a rectangular array distribution, and the bushings are placed on the bushing positioning pins.

[0010] As a further technical solution, three grippers are provided, and the three grippers are installed on a bushing grasping cylinder, and the bushing grasping cylinder is installed on the manipulator.

[0011] As a further technical solution, the gripper is made of polyurethane material.

[0012] As a further technical solution, a first cylinder head tray is arranged on the pre-installation station, a first cylinder head positioning pin is arranged on the first cylinder head tray, and the first cylinder head tray is driven to lift by a first tray lifting drive cylinder.

[0013] As a further technical solution, multiple first guiding bearings are arranged at the bottom of the first cylinder head tray for guiding.

[0014] As a further technical solution, the press-fitting press and the riveting press are fixed on a mounting plate, and the mounting plate is installed on an electric servo-driven sliding table, and the press-fitting press and the riveting press are driven to move horizontally by the electric servo-driven sliding table.

[0015] As a further technical solution, the press-fitting unit further includes a press-fitting station, a second cylinder head tray is arranged on the press-fitting station, and a tray spacer block and a second cylinder head positioning pin are arranged on the second cylinder head tray.

[0016] As a further technical solution, a reaction force support spacer block and a second tray lifting drive cylinder are arranged at the bottom of the second cylinder head tray.

[0017] As a further technical solution, the reaction force support spacer block is driven to move horizontally by a reaction force mechanism drive cylinder.

[0018] The beneficial effects of the above embodiments of the present utility model are as follows:

[0019] The utility model realizes the automation of the whole production process assembly: by using the efficient collaborative work of each assembly unit, the high automation of the whole assembly process, and the application of high-precision and intelligent equipment, it reduces the low efficiency and high energy consumption caused by manual assembly and hydraulic press fitting.

[0020] The utility model realizes the online full-process monitoring of the bushing press-fitting quality: the whole-process curve graph of the press-fitting force and displacement can be displayed on the liquid crystal display touch screen; the whole-process control can automatically judge whether the product is qualified at any stage during the operation, and remove defective products in real time by 100%, thus realizing the online quality management.

[0021] The utility model realizes the co-line production of multiple models: due to the precise pressure of the electric servo press cylinder and the precise displacement control function of the electric ball screw-driven slide table, there is no need to add hard limits to the tooling additionally. When processing products of different specifications, only different press-fitting programs need to be called. Therefore, it can easily realize multi-purpose of one machine and flexible line formation.

[0022] The utility model improves the safety of equipment use: through the overload protection function, position feedback function, emergency stop and other functions of the electric servo press-fitting unit, for the abnormalities occurring during press-fitting, it can quickly feedback and immediately stop press-fitting, avoid collisions caused by position errors, and prevent equipment damage and personal injuries. Brief Description of the Drawings

[0023] The schematic drawings forming a part of the present utility model are used to provide a further understanding of the present utility model. The schematic embodiments and descriptions thereof of the present utility model are used to explain the present utility model and do not constitute an improper limitation to the present utility model.

[0024] Figure 1 is the front view of the injector bushing press-fitting and riveting system of the present utility model;

[0025] Figure 2 is the top view of the bushing tray of the feeding unit of the present utility model without placing the bushing;

[0026] Figure 3 is the top view of the bushing tray of the feeding unit of the present utility model after placing the bushing;

[0027] Figure 4 is the side view of the bushing tray of the feeding unit of the present utility model after placing the bushing;

[0028] Figure 5 is the front view of the feeding unit of the present utility model;

[0029] Figure 6 is the side view of the feeding unit of the present utility model;

[0030] Figure 7is the front view of the pre-installation unit of the present utility model;

[0031] Figure 8 is the side view of the pre-installation unit of the present utility model;

[0032] Figure 9 is the structural schematic diagram of the press-fitting device of the press-fitting unit of the present utility model;

[0033] Figure 10 is the front view of the press-fitting station of the press-fitting unit of the present utility model;

[0034] Figure 11 is the side view of the press-fitting station of the press-fitting unit of the present utility model;

[0035] Figure 12 is the working flow chart of the injector bushing press-fitting and riveting system of the present utility model;

[0036] Figure 13 is the schematic diagram of the process of press-fitting the bushing (the left is for press-fitting the bushing, and the right is for placing the bushing);

[0037] Figure 14 is the schematic diagram of the process of riveting the bushing (the left is for riveting the bushing, and the right is for press-fitting the bushing).

[0038] The schematic diagrams are only for illustration;

[0039] Among them, 1. Feeding unit; 101. Bushing tray; 102. Tray positioning pin; 103. Bushing positioning pin; 2. Loading unit; 201. Connecting bracket; 202. Bushing grabbing cylinder; 203. Claw; 3. Pre-installation unit; 301. Pre-installation station; 302. First cylinder head tray; 303. First tray lifting drive cylinder; 304. First tray lifting in-place detection switch; 305. First tray limit device; 306. First cylinder head positioning pin; 307. First guide bearing; 4. Press-fitting unit; 401. Riveting press; 402. Press-fitting press; 403. Electric servo-driven slide; 404. Press-fitting station; 4041. Second cylinder head tray; 4042. Tray spacer; 4043. Second cylinder head positioning pin; 4044. Reaction support spacer; 4045. Reaction mechanism drive cylinder; 4046. Second tray lifting in-place detection switch; 4047. Second tray lifting drive cylinder; 4048. Second guide bearing; 4049. Second tray limit device; 405. Press-fitting and riveting mechanism; 4051. Press-fitting head; 4052. Riveting head; 406. Side eccentric press-fitting mechanism; 407. Linear slide rail; 5. Bushing; 6. Cylinder head; 601. Injector bushing bottom hole. Specific embodiments

[0040] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present utility model. Unless otherwise specified, all technical and scientific terms used in the present utility model have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present utility model belongs.

[0041] Embodiment 1

[0042] In a typical implementation manner of the present utility model, as Figure 1-11 shown, an injector bushing press-fitting and riveting system is provided, including a feeding unit 1, a loading unit 2, a pre-installation unit 3, and a press-fitting unit 4; wherein, the feeding unit 1 adopts a circular feeding conveyor line, and a bushing tray 101 is placed on the circular feeding conveyor line for placing bushings 5; the loading unit adopts a manipulator, and a gripper 203 is installed on the manipulator for grasping the bushing 5 and placing the bushing 5 into the injector bushing bottom hole 601 of the cylinder head 6; the pre-installation unit includes a pre-installation station 301 for positioning the cylinder head 6; the press-fitting unit 4 includes a press-fitting press 402 and a riveting press 401 for press-fitting and riveting the bushing 5 respectively.

[0043] As Figure 2-4 shown, the bushing tray 101 is installed on the circular conveyor line through a bushing tray positioning pin 102, and the bushing tray 101 is provided with bushing positioning pins 103 distributed in a rectangular array. The bushing 5 is placed on the bushing positioning pins 103 to facilitate the gripper to grasp the bushing. The bushing tray 101 is transported to the manipulator grasping position through the circular conveyor line, and each bushing is positioned through the bushing positioning pins 103 on the bushing tray 101 to ensure the grasping and positioning accuracy of the injector bushing. The circular conveyor line can place 5 trays at one time, meeting the bushing consumption of 100 cylinder heads in a single shift.

[0044] In this embodiment, the circular conveyor line adopts an existing structure.

[0045] As Figure 5 and Figure 6 shown, there are three grippers 203. The three grippers 203 are installed on a bushing grasping cylinder 202. The bushing grasping cylinder 202 is installed on the manipulator through a connecting bracket 201. Two bushing grasping cylinders 202 are installed on each manipulator. Specifically, the bushing grasping cylinder 202 can adopt a FESTO three-point gripper cylinder (DHDS series). This cylinder can provide high clamping force in a compact space, is adapted to an integrated proximity switch to detect the cylinder in place, and realizes the high-precision and reliable grasping and placement of the bushing by controlling the expansion and contraction of the three grippers. At the same time, a double-gripper cylinder is adopted to realize the rapid grasping and installation of the injector bushing through the movement of the manipulator.

[0046] In this embodiment, the manipulator adopts an existing structure. The manipulator is an automatic operating device that can grasp, transport objects or operate tools according to a fixed program. Its feature is that it can complete various expected operations through programming, and combines the respective advantages of humans and mechanical hands in terms of structure and performance.

[0047] In this embodiment, the jaw 203 is made of polyurethane material, which can avoid the collision of the air cylinder jaw 203 on the fuel injector bushing.

[0048] As Figure 7 and Figure 8 shown, a first cylinder head tray 302 is arranged on the pre-installation station 301. A first cylinder head positioning pin 306 is arranged on the first cylinder head tray 302. The first cylinder head tray 302 is driven by a first tray lifting drive cylinder 303 to move up and down.

[0049] Furthermore, a plurality of first guide bearings 307 are arranged at the bottom of the first cylinder head tray 302 for guiding.

[0050] The cylinder head is placed on the conveying device. When the conveying device drives the cylinder head above the pre-installation station 301, the first tray lifting drive cylinder 303 drives the first cylinder head tray 302 to rise, so that the first cylinder head positioning pin 306 enters the positioning hole on the cylinder head to perform precise horizontal positioning on the cylinder head; during the rising process of the first cylinder head tray 302, it is guided by the first guide bearings 307.

[0051] In this embodiment, a first tray lifting in-place detection switch 304 and a first tray limit device 305 are also arranged on the pre-installation station 301. The first tray lifting in-place detection switch 304 is set to achieve precise positioning during the rising or falling process of the first cylinder head tray 302, and the first tray limit device 305 is set to limit the lowest position of the tray when it descends.

[0052] As Figure 9-11 shown, the press-fitting press 402 and the riveting press 401 are fixed on the mounting plate. The mounting plate is installed on the electric servo-driven slide 403, and the press-fitting press 402 and the riveting press 401 are driven by the electric servo-driven slide 403 to move horizontally.

[0053] Furthermore, the press-fitting unit further includes a press-fitting station 404. A second cylinder head tray 4041 is arranged on the press-fitting station 404. A tray spacer 4042 and a second cylinder head positioning pin 4043 are arranged on the second cylinder head tray 4041.

[0054] Furthermore, a reaction force support spacer 4044 and a second tray lifting drive cylinder 4047 are arranged at the bottom of the second cylinder head tray 4041.

[0055] Further, the reaction force support pad 4044 is driven by the reaction force mechanism driving cylinder 4045 to move in position.

[0056] In this embodiment, the press-fitting press 402 and the riveting press 401 are connected to the X-axis electric servo-driven slide table through a connecting plate, which is used to achieve precise positioning and conveying of the movement in the horizontal direction of the X-axis. This slide table is driven by a servo motor, adopts a precision linear guide rail, and the ball screw pair transmits power, and has the characteristics of being able to bear heavy loads, high precision, high speed, and high stability.

[0057] The press-fitting press and the riveting press adopt existing structures. Specifically, 2 Kistler electric servo presses can be used to press-fit and rivet the bushings respectively. The two servo press units are installed with the press-fitting and riveting mechanism 405 through the side eccentric press-fitting mechanism 406. The side eccentric press-fitting mechanism 406 adopts an existing structure to meet the requirements of press-fitting and riveting at the same point. The electric servo press has the advantages of high intelligence, low energy consumption, and strong flexibility. Because of its extremely high control precision, it can ensure that both the pressure and position during the processing process can be accurately controlled, and can maintain a stable output during long-term work, effectively ensuring the consistency of product quality.

[0058] Since the instantaneous pressure during bushing press-fitting can reach 8 KN, a tray pad 4042 is provided on the second cylinder head tray 4041 to increase the contact area between the cylinder head and the pad, disperse the pressure borne by the press-fitting, and at the same time, a reaction force mechanism is specially designed at the bottom of the fuel injector press-fitting position. Its feature is that when the tray rises, the reaction force mechanism driving cylinder 4045 drives the reaction force support pad 4044 to achieve close connection with the bottom of the second cylinder head tray 4041, which not only ensures the in-place press-fitting of the bushing, but also prevents the workpiece deformation caused by excessive local pressure, and ensures the accuracy and safety of the press-fitting process.

[0059] The cylinder head after pre-installing the bushing is conveyed to the upper part of the press-fitting station through the conveying device. The second tray lifting drive cylinder 4047 drives the second cylinder head tray 4041 to move upward, so that the second cylinder head positioning pin 4043 enters the positioning hole on the cylinder head to accurately position the cylinder head in the horizontal direction; during the rising process of the second cylinder head tray 4041, it is guided by the second guiding bearing 4048. When the second cylinder head tray 4041 reaches the set position, the reaction force mechanism driving cylinder 4045 extends to drive the reaction force support pad 4044 to move towards the bottom of the second cylinder head tray 4041 to achieve close connection with the bottom of the second cylinder head tray 4041, realizing the reaction force support for the cylinder head. When the second cylinder head tray 4041 needs to descend, the reaction force mechanism driving cylinder 4045 contracts, so that the driving reaction force support pad 4044 moves out of the bottom of the second cylinder head tray 4041 to make way for the second cylinder head tray 4041.

[0060] In this embodiment, the conveying device adopts an existing structure, specifically, two oppositely arranged roller paths can be adopted, and the pre-installation station 301 and the press-fitting station 404 are located between the two roller paths.

[0061] In this embodiment, a second pallet lifting-in-place detection switch 4046 and a second pallet limiting device 4049 are further arranged at the press-fitting station 404. The second pallet lifting-in-place detection switch 4046 is arranged to achieve precise positioning of the rising or falling process of the second cylinder head pallet 4041, and the second pallet limiting device 4049 is arranged to limit the lowest position of the pallet when it descends.

[0062] The injector bushing press-fitting and riveting system provided in this embodiment has a working process as Figure 12-14 shown, specifically as follows:

[0063] Bushing pre-installation:

[0064] (1) The cylinder head is transported to the pre-installation station 301 through the conveying device. The first pallet lifting drive cylinder 303 raises the first cylinder head pallet 302, and the cylinder head is precisely positioned through the first cylinder head positioning pin 306.

[0065] (2) The manipulator together with the bushing gripping cylinder 202 grabs 2 bushings from the bushing pallet 101 each time, moves to the pre-installation station, and places the bushings 5 into the bottom holes 601 of the injector bushings on the cylinder head 6, as Figure 13 shown. In this way, the operation is repeated three times to place 6 bushings completely.

[0066] Bushing press-fitting:

[0067] (3) The first pallet lifting drive cylinder 303 lowers the first cylinder head pallet 302. The cylinder head reaches the press-fitting station 404 through the conveying device. The second pallet lifting drive cylinder 4047 raises the second cylinder head pallet 4041, and the cylinder head is precisely positioned through the second cylinder head positioning pin 4043. At the same time, the reaction mechanism drive cylinder 4045 drives the reaction support pad 4044 to run to the bottom of the second cylinder head pallet 4041 to provide the press-fitting reaction force.

[0068] (4) The servo motor drives the slide table 403 (X-axis) to drive the Kistler electric servo press-fitting unit to the first hole position. The press-fitting head 4051 first presses the injector bushing in place. While the press-fitting head maintains the pressure, the riveting head 4052 rivets the bushing, as Figure 14 shown.

[0069] (5) The servo press-fitting unit 4 retracts to the original position. The electric servo drives the slide table 403 to drive the press-fitting unit 4 to the second hole position, and then the bushing is press-fitted and riveted again. This process is repeated until 6 injector bushings are press-fitted in place.

[0070] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, various modifications and variations can be made to the present utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. An injector bushing press-fitting and riveting system, characterized in that, It includes a feeding unit (1), a loading unit (2), a pre-installation unit (3) and a press-fitting unit (4); wherein, the feeding unit (1) adopts an annular feeding conveyor line, and a bushing tray (101) is placed on the annular feeding conveyor line for placing bushings (5); the loading unit (2) adopts a manipulator, and a gripper (203) is installed on the manipulator for grasping the bushing (5) and placing the bushing (5) into the fuel injector bushing bottom hole (601) of the cylinder head (6); the pre-installation unit (3) includes a pre-installation station (301) for positioning the cylinder head (6); the press-fitting unit (4) includes a press-fitting press (402) and a riveting press (401) for press-fitting and riveting the bushing (5) respectively.

2. The fuel injector bushing press-fitting and riveting system according to claim 1, characterized in that Bushing positioning pins (103) distributed in a rectangular array are arranged on the bushing tray (101) of the annular conveyor line, and the bushing (5) is placed on the bushing positioning pins (103).

3. The fuel injector bushing press-fitting and riveting system according to claim 1, wherein Three grippers (203) are provided, and the three grippers (203) are installed on a bushing grasping cylinder (202), and the bushing grasping cylinder (202) is installed on the manipulator.

4. The fuel injector bushing press-fitting and riveting system according to claim 3, characterized in that, The gripper (203) is made of polyurethane material.

5. The fuel injector bushing press-fitting and riveting system according to claim 1, characterized in that, A first cylinder head tray (302) is arranged on the pre-installation station (301), a first cylinder head positioning pin (306) is arranged on the first cylinder head tray (302), and the first cylinder head tray (302) is driven to lift by a first tray lifting drive cylinder (303).

6. The injector bushing press-fitting and riveting system according to claim 5, characterized in that, Multiple first guiding bearings (307) are arranged at the bottom of the first cylinder head tray (302) for guiding.

7. The injector bushing press-fitting and riveting system according to claim 1, characterized in that, The press-fitting press (402) and the riveting press (401) are fixed on a mounting plate, and the mounting plate is installed on an electric servo-driven slide (403), and the press-fitting press (402) and the riveting press (401) are driven to move horizontally by the electric servo-driven slide (403).

8. The injector bushing press-fitting and riveting system according to claim 1, characterized in that, The press-fitting unit (4) further includes a press-fitting station (404), a second cylinder head tray (4041) is arranged on the press-fitting station (404), and a tray cushion block (4042) and a second cylinder head positioning pin (4043) are arranged on the second cylinder head tray (4041).

9. The fuel injector bushing press-fitting and riveting system according to claim 8, wherein, A reaction force support cushion block (4044) and a second tray lifting drive cylinder (4047) are arranged at the bottom of the second cylinder head tray (4041).

10. The injector bushing press-fitting and riveting system according to claim 9, characterized in that, The reaction force support cushion block (4044) is driven to move horizontally by a reaction force mechanism drive cylinder (4045).

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