Three-slot lock clamp press mounting press head and press mounting method

Abstract

The application provides a three-groove lock clamp press fitting press head and a press fitting method, and belongs to the technical field of engine accessory assembly. The press fitting press head comprises a press head, a lock clamp clamping block, a press head puller, a center guide block and a connecting block are sequentially arranged in the press head from bottom to top, the center guide block extends into the position of the lock clamp clamping block through the press head puller at the lower part, and the lock clamp clamping block clamps the lock clamp in the press head in cooperation with the center guide block. The upper part of the press head is respectively provided with a press head air hole on the opposite side walls. The application realizes automatic material taking of the lock clamp and the spring seat, improves equipment automation, can accurately control the falling time of the lock clamp, improves the press fitting qualification rate, reduces the repair cost, reduces the equipment failure rate, improves the output capacity, and reduces the equipment maintenance and repair cost.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of engine accessory assembly, and particularly relates to a three-groove lock clamp press-fitting press head and a press-fitting method. BACKGROUND

[0002] On the current engine assembly line, the lock clamp and the spring seat are placed on the valve spring in the cylinder head by manual work in the upper station in advance, and the three-groove lock clamp press-fitting press head is only responsible for press fitting; the press head is mainly composed of a press head shell, a valve lifting rod, a lock clamp top block, a spring seat pressing block and a spring, and the lock clamp top block is kept in a pushed-out state through spring elastic force. The structure has defects mainly in that:

[0003] 1) A labor is occupied for placing the lock clamp and the spring seat manually;

[0004] 2) The whole press head mechanism is returned by the spring, has no active control function, and cannot freely control the lock clamp falling time;

[0005] 3) The internal spring guide pin is too short, and the spring is prone to deformation and fracture, leading to failure;

[0006] 4) There is a quality risk of damaging the lock clamp due to the design under overall strong pressure. SUMMARY

[0007] The application aims to solve the problems in the prior art and provide a three-groove lock clamp press-fitting press head and a press-fitting method.

[0008] The application is achieved by the following technical scheme:

[0009] In a first aspect, the application provides a three-groove lock clamp press-fitting press head, which comprises a press head, a lock clamp clamping block, a press head puller, a center guide block and a connecting block are sequentially arranged in the press head from bottom to top, the center guide block extends into the position of the lock clamp clamping block through the press head puller, and the lock clamp clamping block clamps the lock clamp in the press head in cooperation with the center guide block.

[0010] Opposite side walls of the upper part of the press head are respectively provided with press head air holes.

[0011] Further improvements of the application are as follows:

[0012] A gas pipe joint is arranged on the press head air hole, the gas pipe joint is connected with a vacuum generator through a gas pipe, a negative pressure is formed in the press head air path through the vacuum generator, and the press head spring seat is adsorbed at the end of the lower end of the press head.

[0013] Further improvements of the application are as follows:

[0014] The lock clamp clamping block is provided with two, and is fixed on opposite sides of the lower part of the press head through a snap spring respectively.

[0015] The locking clip clamping block comprises a clamping block, the inner surface of the clamping block is a curved surface matched with the outer surface of the locking clip, and a step extending to the inner side of the clamping block along the inner surface is arranged on the upper end surface of the clamping block.

[0016] A guide hole is formed on the outer surface of the clamping block, a spring is arranged in the guide hole through a guide rod, and a limiting block is arranged on the outer surface of the clamping block.

[0017] The further improvement of the present application is that:

[0018] Two through holes are arranged on the lower part of the pressing head close to the end, and two limiting blocks are arranged in the two through holes respectively and fixed through a snap spring.

[0019] The further improvement of the present application is that:

[0020] The pressing head puller comprises a limiting part, a center hole is arranged on the limiting part in the middle position along the axial direction, connecting rods are arranged on the upper end surface of the limiting part on the opposite sides of the center hole respectively, and the upper part of the connecting rod is connected with a connecting block through a mounting pin and a snap spring.

[0021] Limiting rods are arranged on the lower end surface of the limiting part on the opposite sides of the center hole respectively and formed by downward extension of the lower end surface of the limiting part block, and the two limiting rods are respectively located between the clamping blocks in the two locking clip clamping blocks and in contact with the outer surface edges of the two clamping blocks.

[0022] The further improvement of the present application is that:

[0023] A return spring is arranged on the center guide block through a spring guide rod.

[0024] The further improvement of the present application is that:

[0025] The center guide block comprises a guide part and a guide rod fixed to the lower end of the guide part, the guide rod penetrates through the center hole of the limiting part in the pressing head puller and extends into the position of the locking clip clamping block, and the locking clip is just clamped in the inside of the pressing head through cooperation with the locking clip clamping block.

[0026] The further improvement of the present application is that:

[0027] The opposite side walls of the guide part are respectively provided with guide grooves parallel to the center axis of the guide part and adapted to the positions of the two connecting rods in the pressing head puller, and the two connecting rods penetrate through the guide grooves and are connected with the connecting blocks respectively.

[0028] Two long holes parallel to the axis are arranged in the guide part, one end of the spring guide rod is inserted into the long hole, and the other end is arranged in the connecting block, and the return spring is sleeved on the spring guide rod.

[0029] Further improvement of the present application is:

[0030] The connecting block is arranged at the uppermost part of the pressing head and extends out of the pressing head, the lower end of the connecting block is provided with two holes extending upward from the end face, the positions of the holes are adapted to the positions of the long holes in the center guide block, and the other end of the spring guide rod extends into the hole;

[0031] The lower part of the connecting block is fixedly connected with the upper part of the connecting rod through the mounting pin and the snap spring.

[0032] The second aspect of the present application provides a three-groove lock clamp press fitting method, which uses the three-groove lock head press fitting press head to realize three-groove lock head press fitting, specifically:

[0033] The lock clamp is sent into the press head by using the tool, the lock clamp is clamped in the press head by using the lock clamp clamping block and the center guide block, the lock clamp clamping block is precisely machined according to the size of the lock clamp, and the lock clamp can be effectively fixed in the press head and cannot shake;

[0034] The vacuum generator is started, and the negative pressure generated by the vacuum generator is used to adsorb the spring seat at the end of the lower end of the press head;

[0035] The press fitting press head is moved to the position of the lock clamp clamping groove on the valve rod, then the press head yoke is lifted by the cylinder control, the lock clamp clamping block tightly holds the lock clamp on the groove of the valve rod under the action of the spring, precise control of press fitting is realized, and the lock clamp is prevented from being pressed, at this time, the vacuum generator is turned off, and the press fitting press head is moved upward to complete the press fitting.

[0036] Compared with the prior art, the present application has the following advantages:

[0037] 1) The press head of the present application realizes automatic material taking of the lock clamp and the spring seat, improves the automation of the equipment, and saves labor cost;

[0038] 2) The present application can accurately control the falling time of the lock clamp, improve the press fitting qualification rate, and improve the first time qualification rate FTQ from 92% to 98.5%, and reduce the repair cost;

[0039] 3) The present application prolongs the service life of the spring by designing a suitable guide rod in the spring;

[0040] 4) In the press fitting process of the present application, the lock clamp is installed on the valve rod after being press fitted in place, so that the quality risk of the lock clamp being pressed is avoided;

[0041] 5) This invention reduces equipment failure rate, increasing the equipment failure interval from 42 hours to 200 hours, thereby increasing production capacity and reducing equipment maintenance costs. Attached Figure Description

[0042] Figure 1 This is a schematic diagram of the structure of a three-groove locking clamp press head provided by the present invention;

[0043] Figure 2 This is a schematic diagram of the press head pull fork structure.

[0044] In the diagram, 1 is the pressure head, 2 is the locking clamping block, 3 is the pressure head fork, 301 is the limiting part, 302 is the center hole, 303 is the connecting rod, 304 is the limiting rod, 4 is the center guide block, 5 is the connecting block, 6 is the pressure head air hole, 7 is the spring guide rod, and 8 is the return spring. Detailed Implementation

[0045] The present invention will now be described in further detail with reference to the accompanying drawings:

[0046] like Figure 1 As shown, the present invention provides a three-groove lock head press head, including a press head 1. The press head 1 is provided with a lock clamping block 2, a press head fork 3, a center guide block 4 and a connecting block 5 arranged sequentially from bottom to top. The lower part of the center guide block 4 passes through the press head fork 3 and extends into the position of the lock clamping block 2. The lock clamping block 2 cooperates with the center guide block 4 to clamp the lock inside the press head 1.

[0047] The upper part of the pressure head 1 has pressure head air holes 7 on the opposite side walls. The pressure head air holes 7 are equipped with air pipe connectors. The air pipe connectors are connected to the vacuum generator through air pipes. The vacuum generator creates a negative pressure in the cavity of the pressure head 1, which attracts the pressure head spring seat to the lower end of the pressure head 1.

[0048] During press fitting,

[0049] First, the locking clamp is fed into the pressure head 1 using a tooling. The locking clamping block 2, together with the center guide block 4, clamps the locking clamp inside the pressure head 1. The locking clamping block 2 is precisely machined according to the size of the locking clamp, which can effectively keep the locking clamp in a fixed position inside the pressure head 1 and prevent it from shaking.

[0050] Then, turn on the vacuum generator and use the negative pressure generated by the vacuum generator to attract the spring seat to the lower end of the pressure head;

[0051] Finally, the press head is moved to the position of the locking slot on the valve stem, and then the press head fork 3 is raised by the cylinder. The locking block 2 is clamped on the valve stem groove by the spring, so as to achieve precise control of press-fitting and avoid damage to the locking clip. At this time, the vacuum generator is turned off, and the press head is moved upward to complete the press-fitting.

[0052] As a preferred embodiment of the present application, the locking clip clamping block 2 is provided with two, respectively fixed on the opposite sides of the lower part of the pressure head 1 by the snap spring, the locking clip clamping block 2 includes a clamping block, the inner surface of the clamping block is a curved surface matched with the outer surface of the locking clip, which is precisely processed according to the size of the locking clip, matched with the center guide block 4, can effectively keep the locking clip fixed in the internal position of the pressure head and cannot shake, the upper part of the clamping block is provided with a step extending to the inner side of the clamping block along the inner surface, used for locking the column locking clip and preventing it from moving upward, ensuring the accurate control of the clamping position.

[0053] The outer surface of the clamping block is processed with a guide hole, a spring is arranged in the guide hole through a guide rod, the spring is sleeved on the guide rod, and the outer surface of the clamping block is provided with a limiting block; in order to ensure that the spring does not bend when compressed, according to the space of the spring moving in the internal position of the pressure head, the length of the guide rod is 5 / 4 of the free length of the spring.

[0054] The lower part of the pressure head 1 is provided with two through holes near the end, and two limiting blocks are arranged in the two through holes and fixed by the snap spring. Since the limiting block is fixed on the pressure head by the snap spring, only the clamping block moves inward or outward under the action of the spring, and the limiting block is always stationary.

[0055] When the locking clip is not installed, the inner surfaces of the two clamping blocks are in contact with the center guide block. Due to the action of the pressure head yoke 3 and the center guide block 4, the spring on the locking clip clamping block 2 has a certain compression amount. When the locking clip is installed on the pressure head 1 through the tooling, the inner surfaces of the two clamping blocks are in contact with the outer surface of the locking clip. At this time, the two clamping blocks are pushed backward by the locking clip, and the spring is in a compressed state. The locking clip is fixed and cannot shake by the clamping block and the center guide block 4.

[0056] As a preferred embodiment of the present application, as shown in Figure 2 The pressure head yoke 3 includes a limiting part 301, a center hole 302 is arranged in the middle position of the limiting part 301 along the axis direction, a connecting rod 303 is arranged on the upper end face of the limiting part 301 and located on the opposite sides of the center hole 302, and the upper part of the connecting rod 303 is connected with the connecting block 5 through the mounting pin and the snap spring;

[0057] The lower end surface of the limiting part 301 is provided with limiting rods 304 on the opposite sides of the central hole 302, which are formed by extending downward from the lower end surface of the limiting part 301, and the two limiting rods are respectively located between the clamping blocks of the two locking clamps and are in contact with the outer surface edges of the two clamping blocks, specifically, one of the limiting rods is located between the one ends of the clamping blocks of the two locking clamps and is in contact with the outer surface edges of the one ends of the two clamping blocks, and the other limiting rod is located between the other ends of the clamping blocks of the two locking clamps and is in contact with the outer surface edges of the other ends of the two clamping blocks, and the two limiting rods 304 have a certain width and can push the two locking clamp clamping blocks 2 outward, and when the central guide block 4 is pushed up by the engine valve rod and has not reached the set press-fitting position during the press-fitting process, the pressure head puller 3 remains stationary, at this time the limiting rods 304 can continue to support or push the two locking clamp clamping blocks 2 outward, so as to ensure that the locking clamp clamping blocks 2 are stationary; at the same time, it also ensures that when the locking clamp is installed in the pressure head through the tool, the locking clamp clamping blocks 2 can stably clamp the locking clamp with the central guide block 4.

[0058] The length of the limiting rod 304 cannot extend beyond the front end surface of the pressure head 1, otherwise it will push against the spring seat and cause insufficient suction negative pressure, resulting in feeding failure.

[0059] As a preferred embodiment of the present application, the central guide block 4 is provided with return springs 8 through spring guide rods 7, and the spring guide rods 7 and the return springs are both provided with two; when there is no locking clamp or only the locking clamp is installed without press-fitting, the return springs 8 are in a free expansion state, when the press-fitting process is in progress, the central guide block 4 is pushed on the engine valve rod, at this time the return spring is in a compressed state, after the press-fitting is completed, the return spring resets, and the central guide block 4 returns to the original position under the action of the return spring 8, and at the same time the pressure head puller moves downward to the original position through the cylinder control.

[0060] The central guide block 4 includes a guide part and a guide rod fixed to the lower end of the guide part, the guide rod penetrates through the central hole 302 in the limiting part 301 of the pressure head puller 3 and extends into the position between the two locking clamp clamping blocks 2, and the locking clamp is clamped in the pressure head through cooperation with the locking clamp clamping blocks 2; the opposite side walls of the guide part are respectively provided with guide grooves parallel to the central axis of the guide part and adapted to the positions of the two connecting rods 303 in the pressure head puller 3, the two connecting rods 303 penetrate through the guide grooves and are connected with the connecting block 5; the guide part is also provided with two long holes parallel to the axis, one end of the spring guide rod 7 is inserted into the long hole, and the other end is arranged in the connecting block 5, and the return spring 8 is sleeved on the spring guide rod 7.

[0061] The guide rod is an elliptical column structure, and the end part can be designed as a conical structure.

[0062] The spring guide rod is designed at the position of the spring in the press head 1, and the length of the spring guide rod 7 is 5 / 4 of the free length of the return spring 8.

[0063] As a preferred embodiment of the present application, the connecting block 5 is arranged at the uppermost part of the press head 1 and extends out of the press head, and the lower end of the connecting block 5 is provided with two holes extending upward from the end face, the positions of the holes are adapted to the positions of the two long holes in the center guide block 4, and the other end of the spring guide rod 7 extends into the hole; the lower part of the connecting block 5 is fixedly connected with the upper part of the connecting rod 303 through the mounting pin and the snap spring.

[0064] The top of the connecting block 5 is also connected with the air cylinder, and the connecting block 5 is driven to move upward by the air cylinder, thereby driving the press head yoke 3 to rise.

[0065] The present application also provides a three-groove lock head press mounting method, which uses the above-mentioned three-groove lock head press mounting press head to realize the three-groove lock head press mounting.

[0066] (1) The lock clip is sent into the press head 1 by using the tool, and the lock clip is clamped in the press head by using the lock clip clamping block 2 in cooperation with the center guide block 4, the lock clip clamping block 2 is precisely machined according to the size of the lock clip, and the lock clip can be effectively fixed in the press head 1 and cannot shake;

[0067] (2) The vacuum generator is started, and the negative pressure generated by the vacuum generator is used to adsorb the spring seat at the end of the lower end of the press head;

[0068] (3) The press mounting press head is moved to the position of the lock clip slot on the valve rod (at this time, the center guide block 4 is pushed upward by the valve rod until the lock clip is aligned with the slot on the valve rod), then the press head yoke 3 is lifted by the air cylinder, the lock clip is clamped on the slot of the valve rod by the lock clip clamping block 2 under the action of the spring, the precise control of the press mounting is realized, and the lock clip is prevented from being pressed, at this time, the vacuum generator is turned off, and the press mounting press head is moved upward to complete the press mounting.

[0069] In the present application, the press head press mounting position control can also use the FANUC servo control system, and the press head is controlled to press mount to the set position by the servo control system after the spring seat and the lock clip are arranged on the press head, after the servo is in place, the press head yoke 3 is lifted by the air cylinder, and the lock clip is clamped on the valve rod by the lock clip clamping block 2 under the action of the spring.

[0070] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0071] In the description of the present application, unless otherwise specified, the terms "upper", "lower", "left", "right", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0072] The above technical solution is only one embodiment of the present application. For those skilled in the art, on the basis of the principles disclosed in the present application, various types of improvements or modifications can be easily made, and are not limited to the technical solution described in the above specific embodiments of the present application, therefore the above description is only preferred, and does not have a limiting meaning.

Claims

1. A three-slot lock clip press mounting press head, characterized by, The pressure head is internally provided with, from bottom to top, a locking clamp clamping block, a pressure head yoke, a center guide block and a connecting block, the center guide block extends into the locking clamp clamping block through the pressure head yoke, and the locking clamp clamping block clamps the locking clamp in the pressure head by cooperating with the center guide block; The locking clamp clamping block is provided with two locking clamp clamping blocks which are respectively fixed on the opposite sides of the lower part of the pressure head by clamping springs, the locking clamp clamping block comprises a clamping block, the inner surface of the clamping block is a curved surface matched with the outer surface of the locking clamp, the upper end surface of the clamping block is provided with a step extending to the inner side of the clamping block along the inner surface, the outer surface of the clamping block is provided with a guide hole, the guide hole is provided with a spring through a guide rod, and the outer surface of the clamping block is provided with a limiting block.

2. The three-slot lock clamp press head of claim 1, wherein, A gas pipe joint is arranged on the pressure head gas hole, the gas pipe joint is connected with a vacuum generator through a gas pipe, a negative pressure is formed in the pressure head gas path through the vacuum generator, and the pressure head spring seat is adsorbed at the end of the lower end of the pressure head.

3. The three-slot lock clamp press head of claim 1, wherein, Two opposite through holes are arranged at the position close to the end of the lower part of the pressure head, and two limiting blocks are arranged in the two through holes and are fixed by clamping springs.

4. The three-slot lock clamp press head of claim 3, wherein, The pressure head yoke comprises a limiting part, a center hole is arranged in the middle position of the limiting part along the axis direction, connecting rods are arranged on the upper end surface of the limiting part on the opposite sides of the center hole and at the edge position of the limiting part, and the upper part of the connecting rod is connected with the connecting block through a mounting pin and a clamping spring; Limiting rods are arranged on the lower end surface of the limiting part on the opposite sides of the center hole and are formed by extending downward from the lower end surface of the limiting part, and the two limiting rods are respectively arranged between the clamping blocks of the two locking clamp clamping blocks and are in contact with the edge of the outer surface of the two clamping blocks.

5. The three-slot lock clamp press head of claim 4, wherein, A return spring is arranged on the center guide block through a spring guide rod; Both the spring guide rod and the return spring are provided with two.

6. The three-slot lock clamp press head of claim 5, wherein, The center guide block comprises a guide part and a guide rod fixed to the lower end of the guide part, the guide rod extends into the position of the locking clamp clamping block through the center hole of the limiting part in the pressure head yoke, and the locking clamp is clamped in the pressure head by cooperating with the locking clamp clamping block.

7. The three-slot lock clamp press head of claim 6, wherein, Opposite side walls of the guide part are respectively provided with guide grooves which are parallel to the center axis of the guide part and are adapted to the positions of the two connecting rods in the pressure head yoke, and the two connecting rods respectively pass through the guide grooves and are connected with the connecting block; The guide part is further provided with two long holes parallel to the axis, one end of the spring guide rod is inserted into the long hole, and the other end is arranged in the connecting block; The return spring is sleeved on the spring guide rod.

8. The three-slot lock clamp press head of claim 7, wherein, The connecting block is arranged at the uppermost part of the pressure head and extends out of the pressure head, the lower end of the connecting block is provided with two holes extending upward from the end surface, the positions of the holes are adapted to the positions of the long holes in the center guide block, and the other end of the spring guide rod extends into the hole; The lower part of the connecting block is fixedly connected with the upper part of the connecting rod through a mounting pin and a clamping spring.

9. A method of press fitting a three-slot lock clip, characterized by, The three-groove lock head is pressed by using the three-groove lock clamp pressing head according to any one of claims 1-8, and specifically: The lock clamp is sent into the pressing head by using a tool, and the lock clamp is clamped in the pressing head by using the lock clamp clamping block cooperating with the center guide block; The vacuum generator is started, and the spring seat is adsorbed at the lower end of the pressing head by using the negative pressure generated by the vacuum generator; The pressing head is moved to the position of the lock clamp clamping groove on the valve rod, then the pressing head yoke is lifted by the cylinder control, the lock clamp clamping block tightly holds the lock clamp on the groove of the valve rod under the action of the spring, the precise control of pressing is realized, and the lock clamp is prevented from being pressed, at this time, the vacuum generator is closed, and the whole pressing head is moved upward to complete the pressing.

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