Double-sided hydraulic clamp for valve cover machining

Abstract

The utility model relates to the technical field of machining clamps, and provides a double-sided hydraulic clamp for valve cover machining, which comprises a clamp bottom plate, four shafts, a tailstock, a first clamping mechanism and a second clamping mechanism, four shafts and a tailstock are respectively arranged on the clamp bottom plate; a bridge plate is arranged between the fourth shaft and the tailstock; the output end of the fourth shaft is connected with the bridge plate; the first clamping mechanism is installed on one face of the bridge plate, and the second clamping mechanism is installed on the other face of the bridge plate. The first clamping mechanism comprises a single-point-face positioning block, a double-point-face positioning block, a double-point positioning seat, a single-point positioning seat, a positioning block, a large-size push cylinder, a lengthened push column, a second pressing plate, three first pressing plates and two small-size push cylinders, all of which are arranged on the bridge plate. According to the vertical machining center, all working procedures of a valve cover product are combined into one working procedure to be completed through one set of clamp, and all machining contents of the valve cover product are completed on one vertical machining center.

Description

TECHNICAL FIELD

[0001] The utility model relates to mechanical processing fixture technical field especially relates to a double -sided hydraulic fixture for bonnet processing. BACKGROUND

[0002] The solenoid valve is used to control the automation basic element of fluid, with more function demand in the industrial control system, the solenoid valve is also in continuous updating, especially the bonnet has more complexity. The bonnet is directly connected with each execution element, in order to realize multifunctional control, increase control hole, this makes the internal structure of bonnet more and more complex, brings the difficulty to processing.

[0003] As shown in Figures 1-4 The bonnet has the top surface, the big bottom surface, two long side surfaces, two short side surfaces, the top surface has the first contact surface 1, the second contact surface 3, the third contact surface 6, the fourth contact surface 8, the fifth contact surface 11, the seventh contact surface 23, the eighth contact surface 24, the big bottom surface has the first hole 32, the second hole 33, the first positioning hole 35, the second positioning hole 37, one short side surface of the bonnet has the first blank hole 17, the second blank hole 19, the ninth contact surface 27, and the other short side surface has two first blank holes 17, the sixth contact surface 13.

[0004] At present, the bonnet processing generally adopts three processes, the first process processes the big bottom surface and hole on the vertical machining center, the second process processes the top surface and hole also on the vertical machining center, and the third process processes the outer peripheral surface and hole on the horizontal machining center. Such processing method needs to be equipped with fixtures on vertical machining center and horizontal machining center respectively, the equipment cost is high, and the bonnet needs to be turned over for many times in the processing process, and the bonnet clamping and turnover process is complicated. UTILITY MODEL CONTENTS

[0005] The utility model mainly solves the technical problem in prior art that needs to be equipped with fixtures on vertical machining center and horizontal machining center respectively, the equipment cost is high, and the bonnet clamping and turnover process is complicated, and provides a double-sided hydraulic fixture for bonnet processing, all processes of the bonnet product are combined into one process to be completed by one set of fixture, all processing contents of the bonnet product are completed on one vertical machining center, the product loading and unloading are convenient, fast, efficient, stable and reliable.

[0006] The utility model provides a double -sided hydraulic fixture for bonnet processing, it includes: fixture bottom plate, four -axis, tail seat, first clamping mechanism and second clamping mechanism,

[0007] Four -axis and tail seat are set up respectively on the fixture bottom plate, bridge plate is set up between four -axis and tail seat, and the output end of four -axis is connected with bridge plate.

[0008] One side of the bridge plate is provided with a first clamping mechanism, and the other side is provided with a second clamping mechanism;

[0009] The first clamping mechanism comprises a single-point surface positioning block, a double-point surface positioning block, a double-point positioning seat, a single-point positioning seat, a positioning block, a large-size pushing cylinder, an elongated pushing column, a second pressing plate, three first pressing plates and two small-size pushing cylinders arranged on the bridge plate;

[0010] The double-point positioning seat is provided with a left positioning block and a right positioning block;

[0011] The inner side of the left end of the double-point positioning seat is sequentially provided with a second pressing plate, a single-point surface positioning block, a first pressing plate and a small-size pushing cylinder; the second pressing plate is rotatable; the outer side of the single-point surface positioning block is provided with an elongated pushing column; and the elongated pushing column is arranged at the telescopic end of the large-size pushing cylinder;

[0012] The inner side of the right end of the double-point positioning seat is sequentially provided with a first pressing plate, a positioning block, a first pressing plate and a small-size pushing cylinder; the positioning block is arranged at the inner side of the single-point positioning seat; the inner side of the positioning block is provided with a double-point surface positioning block; and the double-point surface positioning block is provided with an upper positioning surface and a lower positioning surface;

[0013] The three first pressing plates are rotatable; the telescopic rod of one of the small-size pushing cylinders is hinged to a left L-shaped pressing rod, and the telescopic rod of the other small-size pushing cylinder is hinged to a right L-shaped pressing rod;

[0014] The second clamping mechanism comprises a second clamping mechanism bottom plate and a cylindrical pin, a rhombic pin, two guide rods, four surface positioning blocks and four third lever clamping cylinders arranged on the second clamping mechanism bottom plate;

[0015] The second clamping mechanism bottom plate is fixed on the bridge plate; the four third lever clamping cylinders are distributed in a rectangular shape on the second clamping mechanism bottom plate; one third pressing plate is arranged on each third lever clamping cylinder; one surface positioning block is arranged below each third pressing plate; and air holes are left on the surface positioning blocks;

[0016] The cylindrical pin is arranged on the outer side of the upper left surface positioning block, and the rhombic pin is arranged on the outer side of the lower right surface positioning block;

[0017] One guide rod is arranged between the two left third pressing plates, and the other guide rod is arranged between the two right third pressing plates.

[0018] Preferably, the clamp bottom plate is provided with four spindles and tail seats through the gaskets;

[0019] The four-spindle ear plate of the four spindle is connected to one end of the bridge plate, and the tail seat ear plate of the tail seat is connected to the other end of the bridge plate.

[0020] Preferably, the three first pressing plates are rotatably arranged by first lever clamping cylinders respectively;

[0021] The second pressing plate is rotatably arranged by a second lever clamping cylinder;

[0022] The second lever clamping cylinder and the three first lever clamping cylinders are respectively arranged on a bridge plate.

[0023] Preferably, the bridge plate is provided with a rear flange type support cylinder and nine first external thread type support cylinders.

[0024] Preferably, the top end of the single-point surface positioning block is provided with a crescent groove.

[0025] Preferably, the lower part of the front end of the second pressing plate and the three first pressing plates adopts an arc surface;

[0026] The front end of the second pressing plate and the three first pressing plates adopts a folded structure;

[0027] The front end of the second pressing plate and the three first pressing plates are chamfered.

[0028] Preferably, two second external thread type support cylinders are arranged on both sides of each guide rod.

[0029] The double-sided hydraulic clamp for valve cover machining can be applied to machining on a vertical machining center with four shafts and hydraulic multi-input and multi-output, a bridge plate is arranged between the four shafts and a tailstock, first, the valve cover product is horizontally clamped on one side of the bridge plate, the large bottom surface faces upward, and the machining of the large bottom surface and holes and the two long side surfaces and holes is mainly completed; then, the valve cover product is vertically clamped on the other side of the bridge plate, the top surface faces upward, and the machining of the top surface and holes and the two short side surfaces and holes is mainly completed. Through the application of the double-sided hydraulic clamp, all processes of the valve cover product are combined into one process to be completed, and the equipment cost is reduced; all machining contents of the valve cover product are completed on one vertical machining center, compared with the machining of the valve cover product by three machining centers in the past, the utility model has a breakthrough improvement, the production efficiency is obviously improved, and the machining cost is obviously reduced.

[0030] In conclusion, the clamp scheme can be applied to most vertical machining center four shafts, can be widely applied, and can fundamentally solve the above-mentioned problems. The utility model is simple in loading and unloading, stable and reliable, has strong universality and wide applicability, is not only suitable for valve cover products, but also suitable for milling, drilling, tapping and boring of most thin cover products. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 is a structure diagram of a valve cover to be machined Figure One (horizontal top surface angle).

[0032] Figure 2 is the structure diagram of the valve cover to be processed by the utility model Figure Two (horizontal large bottom surface angle);

[0033] Figure 3 is the structure diagram of the valve cover to be processed by the utility model Figure Three (vertical top surface angle);

[0034] Figure 4 is the structure diagram of the valve cover to be processed by the utility model Figure Four (vertical large bottom surface angle);

[0035] Figure 5 is the structure diagram of the double-face hydraulic clamp for valve cover processing provided by the utility model;

[0036] Figure 6 is the clamping state diagram of the double-face hydraulic clamp for valve cover processing provided by the utility model;

[0037] Figure 7 is the structure diagram of the first clamping mechanism provided by the utility model;

[0038] Figure 8 is the clamping state diagram of the first clamping mechanism provided by the utility model;

[0039] Figure 9 is the structure diagram of the second clamping mechanism provided by the utility model;

[0040] Figure 10 is the clamping state diagram of the second clamping mechanism provided by the utility model.

[0041] 1, first contact surface; 2, single-point surface positioning block; 3, second contact surface; 4, double-point surface positioning block; 5, upper positioning surface; 6, third contact surface; 7, lower positioning surface; 8, fourth contact surface; 9, double-point positioning seat; 10, left positioning block; 11, fifth contact surface; 12, right positioning block; 13, sixth contact surface; 14, single-point positioning seat; 15, positioning block; 16, first pressing plate; 17, first blank hole; 18, second pressing plate; 19, second blank hole; 20, small-size pushing cylinder; 21, left L-shaped pressing rod; 22, right L-shaped pressing rod; 23, seventh contact surface; 24, eighth contact surface; 25, large-size pushing cylinder; 26, lengthened pushing column; 27, ninth contact surface; 28, first lever clamping cylinder; 29, flange type supporting cylinder; 30, first external thread type supporting cylinder; 31, second lever clamping cylinder; 32, first hole; 33, second hole; 34, guide rod; 35, first positioning hole; 36, cylindrical pin; 37, second positioning hole; 38, rhombic pin; 39, surface positioning block; 40, third lever clamping cylinder; 41, third pressing plate; 42, second external thread type supporting cylinder; 43, clamp bottom plate; 44, pad plate; 45, bridge plate; 46, four-axis; 47, four-axis ear plate; 48, tailstock; 49, tailstock ear plate. DETAILED DESCRIPTION

[0042] In order to make the technical problems solved by the utility model, the technical scheme adopted and the technical effects reached more clear, the utility model will be further described in detail below in combination with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the utility model, not to limit the utility model. In addition, it needs to be explained that only the parts related to the utility model are shown in the drawings for the convenience of description, not all the contents.

[0043] As shown in Figures 5-6 the utility model embodiment provides a double-face hydraulic clamp for valve cover processing, which comprises a clamp bottom plate 43, four-axis 46, tailstock 48, first clamping mechanism and second clamping mechanism.

[0044] The four-axis 46 and tailstock 48 are respectively arranged on the clamp bottom plate 43; the four-axis 46 and tailstock 48 are respectively arranged on the clamp bottom plate 43 through the pad plate 44. The pad plate 44 plays the role of heightening. When the bridge plate 45 both sides are clamped valve cover products, if the height is not enough, it may cause the valve cover product to touch the big bottom plate in the process of four-axis 46 rotation, and the setting of the pad plate 44 effectively solves this problem. In addition, the pad plate 44 adopts thickened steel plate, which has enough rigidity and is subjected to quenching and tempering treatment, which provides guarantee for stable processing. The outer ends of the four-axis 46 and tailstock 48 are respectively provided with rotary joints; the rotary joint is a kind of hydraulic element, which has multiple oil way joints and airway joints.

[0045] The bridge plate 45 is arranged between the four shaft 46 and the tail seat 48; the output end of the four shaft 46 is connected with the bridge plate 45, and the four shaft 46 can drive the bridge plate 45 to rotate; specifically, the four shaft lug plate 47 of the four shaft 46 is connected with one end of the bridge plate 45, and the tail lug plate 49 of the tail seat 48 is connected with the other end of the bridge plate 45. One side of the bridge plate 45 is provided with the first clamping mechanism, and the other side is provided with the second clamping mechanism.

[0046] As shown in the Figures 7-8 The first clamping mechanism comprises a single-point surface positioning block 2, a double-point surface positioning block 4, a double-point positioning seat 9, a single-point positioning seat 14, a positioning block 15, a large-size push cylinder 25, an extended push column 26, a second pressing plate 18, three first pressing plates 16 and two small-size push cylinders 20 arranged on the bridge plate 45.

[0047] The double-point positioning seat 9 is provided with a left positioning block 10 and a right positioning block 12.

[0048] The inner side of the left end of the double-point positioning seat 9 is sequentially provided with the second pressing plate 18, the single-point surface positioning block 2, one first pressing plate 16 and one small-size push cylinder 20; the second pressing plate 18 is rotatable; the outer side of the single-point surface positioning block 2 is provided with the extended push column 26; and the extended push column 26 is arranged at the telescopic end of the large-size push cylinder 25.

[0049] The inner side of the right end of the double-point positioning seat 9 is sequentially provided with one first pressing plate 16, the positioning block 15, one first pressing plate 16 and one small-size push cylinder 20; the positioning block 15 is arranged at the inner side of the single-point positioning seat 14; the inner side of the positioning block 15 is provided with the double-point surface positioning block 4; and the double-point surface positioning block 4 is provided with an upper positioning surface 5 and a lower positioning surface 7.

[0050] The three first pressing plates 16 are rotatable; the telescopic rod of one small-size push cylinder 20 is hinged with a left L-shaped pressing rod 21, and the telescopic rod of the other small-size push cylinder 20 is hinged with a right L-shaped pressing rod 22; the left L-shaped pressing rod 21 is further hinged with the hinge seat arranged on the corresponding small-size push cylinder 20, and the end of the left L-shaped pressing rod 21 is directed to the single-point surface positioning block 2; the right L-shaped pressing rod 22 is further hinged with the hinge seat arranged on the corresponding small-size push cylinder 20, and the end of the right L-shaped pressing rod 22 is directed to the double-point surface positioning block 4.

[0051] Three first pressing plates 16 are rotatably arranged through first lever clamping cylinders 28 respectively; the second pressing plate 18 is rotatably arranged through a second lever clamping cylinder 31; the second lever clamping cylinder 31 and the three first lever clamping cylinders 28 are respectively installed on a bridge plate 45, the first pressing plate 16 is installed at the telescopic end of the first lever clamping cylinder 28; the second pressing plate 18 is installed at the telescopic end of the second lever clamping cylinder 31. The lower part of the front end of the second pressing plate 18 and the three first pressing plates 16 adopts an arc surface; the front end of the second pressing plate 18 and the three first pressing plates 16 adopts a folded structure; the front end of the second pressing plate 18 and the three first pressing plates 16 are chamfered.

[0052] The bridge plate 45 is provided with a rear flange type supporting cylinder 29 and nine first external thread type supporting cylinders 30. The first external thread type supporting cylinder 30 is installed on the bridge plate 45 through a double-point positioning seat 9 or a cushion block.

[0053] The first clamping mechanism of the utility model mainly is in order to complete the processing of the big bottom surface and two long side surfaces of valve cover, and the width of the valve cover is smaller to the right side, and the big bottom surface and two long side surfaces are exposed after clamping without shielding, so that subsequent processing is facilitated. The first clamping mechanism can realize face positioning function, long side surface two-point positioning function, short side surface single-point positioning function, clamping function, supporting function, floating supporting function and the like.

[0054] The face positioning function is mainly realized by a single-point face positioning block 2 and a double-point face positioning block 4, and the single-point face positioning block 2 and the double-point face positioning block 4 have three positioning points in total, which are respectively corresponded to the three semicircular arc vertices on the end face of the valve cover. The top end of the single-point face positioning block 2 is provided with a crescent groove, which can effectively avoid a small boss on the semicircular arc surface of the valve cover. The single-point face positioning block 2 is arranged on the left fixed seat, and the double-point face positioning block is arranged on the right fixed seat. Three points determine a plane, so that the valve cover product can be accurately positioned.

[0055] The two-point positioning function of the long side is mainly realized by the double-point positioning seat 9, which is used to support the lower part of the long side of the valve cover. The double-point positioning seat 9 is provided with a support on both sides, and the top end of the support is respectively provided with a left positioning block 10 and a right positioning block 12. The double-point positioning seat 9 is made of alloy steel material, has high hardness and good wear resistance after heat treatment, and improves the service life of the clamp. The left positioning block 10 and the right positioning block 12 are respectively in contact with the blank surface of the lower long side for positioning, and the end of the left positioning block 10 and the right positioning block 12 is rounded and chamfered, small-area contact reduces the influence of the large size difference of the blank surface, and makes the positioning more accurate. In addition, the left L-shaped pressure rod push cylinder seat and the right L-shaped pressure rod push cylinder seat are respectively arranged on the bridge plate 45 (corresponding to the positions of the two ends of the long side of the valve cover product), and the small-sized push cylinder 20 is arranged on the left L-shaped pressure rod push cylinder seat and the right L-shaped pressure rod push cylinder seat. One small-sized push cylinder 20 is connected to one end of the left L-shaped pressure rod 21, and the other small-sized push cylinder 20 is connected to one end of the right L-shaped pressure rod 22. The other end of the left L-shaped pressure rod 2 and the right L-shaped pressure rod 22 can be in contact with the blank surface of the upper long side, so as to push the valve cover product to move to the left positioning block 10 and the right positioning block 12 and clamp, and the two push points are respectively opposite to the left positioning block 10 and the right positioning block 12, which makes the double-point positioning after clamping more accurate and reliable. Through the above design, the double-point accurate positioning is completed.

[0056] The single-point positioning function of the short side is mainly realized by the single-point positioning seat 14, which is arranged on the right fixed seat. The positioning block 15 is arranged on the left upper part of the single-point positioning seat 14, and is in contact with the blank surface of the right short side for positioning. The single-point positioning seat 14 is made of alloy steel material and has high service life. The end of the positioning block 15 is also rounded and chamfered, which can position more accurately. In addition, a push cylinder seat is arranged on the left side of the bridge plate 45, which is arranged on the left fixed seat. The push cylinder seat is provided with a large-sized push cylinder 25, and the large-sized push cylinder 25 is provided with an elongated push column 26. The elongated push column 26 can be in contact with the blank surface of the left short side, so as to push the valve cover to move to the positioning block 15 and clamp. The push point is opposite to the positioning point, which makes the single-point positioning after clamping more accurate and reliable. Through the above design, the single-point accurate positioning is completed.

[0057] The clamping design is challenging. The large bottom surface of the valve cover needs machining to ensure all components of the first clamping mechanism are below this surface. Otherwise, interference will occur when the face milling cutter is used to machine the large bottom surface. The outer perimeter of the large bottom surface is a single, flat surface without recesses, making it impossible to place the pressure plate within a recess using conventional designs. To avoid interference, the clamping points must be placed within the casting holes on the short sides. The difficulty lies in the curved bottom of the casting holes, which would cause the conventional pressure plate to leave gaps. Therefore, the lower front ends of the second pressure plate 18 and the three first pressure plates 16 are designed as curved surfaces, solving the gap-filling problem. Furthermore, the clamping points are directly aligned with the positioning points of the single-point positioning block 2 and the double-point positioning block 4 of the valve body, ensuring a secure clamping. Additionally, due to the relatively small size of the casting holes, the front ends of the second pressure plate 18 and the three first pressure plates 16 are prone to scraping against them during rotation. Therefore, the front ends of the second pressure plate 18 and the three first pressure plates 16 are chamfered to effectively avoid this. Small push cylinders 20 are installed on the left and right fixed seats respectively. The small push cylinders 20 are lever clamping cylinders. Since the mounting base of the large clamping force lever clamping cylinder is relatively large, their center distance is greater than the center distance of the casting holes on the short sides. Therefore, the front ends of the second pressure plate 18 and the three first pressure plates 16 are designed with a folded structure, which allows the front ends of the pressure plates to penetrate into the casting holes and clamp. The above design achieves reliable clamping of the valve cover product.

[0058] The four clamping points (second pressure plate 18 and three first pressure plates 16) are directly opposite three surface positioning points (single-point surface positioning block 2 and double-point surface positioning block 4). However, a fixed surface positioning point cannot be set below the clamping point on the lower left, because only three points can define a plane. For this purpose, a flange-type support cylinder 29 is provided. The top of the flange-type support cylinder 29 can move upward and contact and support a small boss on the side arc surface of the valve cover end face. This support point is directly opposite the clamping point on the lower left, and it has sufficient supporting force to make the clamping very secure.

[0059] Because the valve cover is a thin-cap product with no clamping or support in the middle, vibration is inevitable during processing, leading to dimensional inaccuracies. Therefore, nine first external thread type support cylinders 30 are installed for floating support. These are located on the left fixed seat, right fixed seat, double-point positioning seat 9, upper floating support cylinder seat, and middle floating support cylinder seat. When the valve cover is clamped, the tops of the nine first external thread type support cylinders 30 rise and contact the blank surface of the valve cover, providing comprehensive and effective support and ensuring smooth subsequent processing.

[0060] like Figures 9-10 As shown, the second clamping mechanism includes: a second clamping mechanism base plate and cylindrical pins 36, rhomboid pins 38, two guide rods 34, four face positioning blocks 39, and four third lever clamping cylinders 40 disposed on the second clamping mechanism base plate.

[0061] The second clamping mechanism base plate is fixed on the bridge plate 45. Four third lever clamping cylinders 40 are distributed in a rectangular shape on the second clamping mechanism base plate; one third pressing plate 41 is arranged on each third lever clamping cylinder 40; one face positioning block 39 is arranged below each third pressing plate 41; the face positioning block 39 is provided with air holes; the air holes are connected to an external compressed air pipe through a tail seat 48, and are used to perform air detection.

[0062] The cylindrical pin 36 is arranged outside the upper left face positioning block 39, and the rhombic pin 38 is arranged outside the lower right face positioning block 39.

[0063] One guide rod 34 is arranged between the left two third pressing plates 41, and another guide rod 34 is arranged between the right two third pressing plates 41. Two second external thread type support cylinders 42 are distributed on both sides of each guide rod 34, and there are a total of eight second external thread type support cylinders 42.

[0064] The second clamping mechanism is mainly used to complete the machining of the top surface and the two short side surfaces and the hole. After clamping, the end surface and the two short side surfaces of the valve cover product with a small width are exposed and not shielded, so as to facilitate subsequent machining. The second clamping mechanism has the functions of face positioning, centering, rough guiding, clamping, floating support, etc.

[0065] The face positioning function is mainly completed by the contact between the four face positioning blocks 39 and the large bottom surface of the machined valve cover. The large bottom surface of the machined valve cover has very good flatness, can be effectively contacted and positioned by the four face positioning blocks 39 at the same time, and will not have a gap to cause clamping deformation. In addition, the face positioning block 39 is also designed with an air detection function. When the large bottom surface is effectively contacted with the top surface of the face positioning block 39 and is clamped, all the air holes will be sealed. At this time, the compressed air is opened to enter the face positioning block 39, and air leakage will not occur. If the large bottom surface is not in good contact with the top surface of the face positioning block 39 due to poor machining of the large bottom surface or the presence of debris, dirt, etc., some air holes will not be sealed after clamping, and air leakage will occur. The operator can easily determine whether the large bottom surface is effectively contacted and positioned with the top surface of the face positioning block 39 by whether there is air leakage. This air detection function can accurately and quickly determine whether the large bottom surface is effectively contacted and positioned with the top surface of the face positioning block 39, and is very practical and worth promoting.

[0066] The centering function is mainly completed by the cylindrical pin 36 and the diamond pin 38, which are centered with the tolerance holes machined in the first clamping mechanism, and the centering gap is small, so that the position of the valve cover product is accurately fixed after the valve cover product is sleeved on the cylindrical pin 36 and the diamond pin 38, and centering is not needed again. When the valve cover product is placed in the second clamping mechanism, the operator cannot see the cylindrical pin 36 and the diamond pin 38, and therefore two guide rods 34 are arranged, which are coarsely guided with the intermediate holes machined in the first clamping mechanism of the valve cover product, and the guide gap is large and easy to put in. Through the above design, the valve cover product can be easily placed in the second clamping mechanism, and the valve cover product is accurately and conveniently placed.

[0067] The clamping function is mainly completed by the four third lever clamping cylinders 40, and the third pressing plate 41 on the third lever clamping cylinder 40 is directly pressed in the recess of the valve cover product. After clamping, the highest point of the third pressing plate 41 of the four third lever clamping cylinders 40 is lower than the upper end surface of the valve cover product, so that the subsequent face milling is facilitated. In order to avoid vibration during machining, eight second external thread type supporting cylinders 42 are arranged on the fixed plate, and the top of the eight second external thread type supporting cylinders 42 is raised to contact the large bottom surface of the valve cover product machined, so as to effectively support the valve cover product and ensure smooth machining.

[0068] The above components are connected and fixed through positioning pins and internal hexagonal screws, and the oil circuit is designed in the inside of the bridge plate 45 and the second clamping mechanism bottom plate. The hydraulic oil supplied by the vertical machining center flows in the inside of the clamp, so that the clamp is more safe and reliable.

[0069] The working process of the double-face hydraulic clamp for valve cover machining provided by the embodiment of the utility model is as follows:

[0070] Firstly, the clamp is installed on the workbench of the vertical machining center, and the internal hexagonal screw is tightened for fastening. The four-axis 46 is connected and debugged to ensure normal use. Then the first clamping mechanism is rotated to be upward by manually controlling the rotating four-axis 46. Thus, the preparation work of clamping the valve cover product is completed.

[0071] The valve cover blank is placed horizontally into the first clamping mechanism, with the large bottom surface facing up, the smaller width side facing right, so that the first contact surface 1 of the valve cover blank corresponds to the positioning surface of the single-point surface positioning block 2, the second contact surface 3 corresponds to the upper positioning surface 5 of the double-point surface positioning block 4, the third contact surface 6 corresponds to the lower positioning surface 7 of the double-point surface positioning block 4, the fourth contact surface 8 corresponds to the positioning surface of the left positioning block 10 on the double-point positioning seat 9, the fifth contact surface 11 corresponds to the positioning surface of the right positioning block 12 on the double-point positioning seat 9, and the sixth contact surface 13 corresponds to the positioning surface of the positioning block 15 on the single-point positioning seat 14. Slowly place the valve cover blank until the valve cover blank contacts and is positioned by the positioning surfaces of the single-point surface positioning block 2 and the double-point surface positioning block 4, and the other contact surfaces of the valve cover blank contact or are close to the positioning surfaces. Visually confirm that the front ends of the three first pressing plates 16 can be screwed into the three first blank holes 17 on the side of the valve cover blank, and the front end of the second pressing plate 18 can be screwed into the second blank hole 19 on the side of the valve cover blank.

[0072] Start the hydraulic clamping control button of the vertical machining center, first the two small size push cylinders 20 push the left L-shaped pressing rod 21 and the right L-shaped pressing rod 22 to rotate around their respective fulcrums, the left L-shaped pressing rod 21 contacts the seventh contact surface 23 of the valve cover blank and pushes towards the left positioning block 10, and the right L-shaped pressing rod 22 contacts the eighth contact surface 24 of the valve cover blank and pushes towards the right positioning block 12, until the valve cover blank contacts and is positioned by the left positioning block 10 and the right positioning block 12. Then the large size push cylinder 25 pushes the elongated push column 26 to contact the ninth contact surface 27 of the valve cover blank and pushes towards the positioning block 15, until the valve cover blank contacts and is positioned by the positioning block 15.

[0073] Subsequently, the three first lever clamping cylinders 28 start to act, driving the three first pressing plates 16 to rotate, their front ends extending into the first blank holes 17 and clamping the valve cover blank. After clamping, the flange type support cylinder 29 and the nine first external thread type support cylinders 30 start to act, lifting their top heads to press against the valve cover blank. Then the second lever clamping cylinder 31 starts to act, driving the second pressing plate 18 to rotate, its front end extending into the second blank hole 19 and clamping the valve cover blank.

[0074] At this point, the positioning and clamping of the valve cover blank in the first clamping mechanism are completed. Start to debug the machining of the large bottom surface and the two long side surfaces of the valve cover blank. After machining, use external blowing equipment to remove the debris, cutting fluid and other residues on the fixture and valve cover product. Start the hydraulic release control button of the machining center, all L-shaped pressing rods of the small size push cylinders 20, the elongated push column 26 of the large size push cylinder 25, the top heads of the flange type support cylinder 29 and the first external thread type support cylinder 30 all retreat to the initial position, and all first lever clamping cylinders 28 rotate the first pressing plates 16 and the second lever clamping cylinder 31 rotates the second pressing plate 18 to retreat to the initial position. Take out the valve cover product, clean it up and place it on the turnover table, waiting to be loaded into the second clamping mechanism.

[0075] Then manually control four-axis rotation 180°, let the second clamping mechanism upward, facilitate clamping in the first clamping mechanism processing finished valve cover product.

[0076] The valve cover product is placed vertically into the second clamping mechanism, the finished large bottom surface is placed downward, the width of the small side is placed downward, the first hole 32 and the second hole 33 of the valve cover product correspond to the two guide rods 34, the first positioning hole 35 corresponds to the cylindrical pin 36, the second positioning hole 37 corresponds to the diamond pin 38, the valve cover product is slowly put in, first the valve cover product will be sleeved into the guide rod 34, which plays a rough positioning role, then the valve cover product will be easily sleeved into the cylindrical pin 36 and the diamond pin 38, and finally the large bottom surface will be in contact with and positioned by the four face positioning blocks 39.

[0077] Manually start the hydraulic clamping of the machining center, the four third lever clamping cylinders 40 start to act, drive the four pressure plates 41 to rotate, directly press in the recess table of the valve cover product, and complete the clamping of the valve cover product. Then the eight external thread type support cylinders 42 start to act, lift their top heads and press against the valve cover product.

[0078] Then manually start the compressed air to carry out air detection, observe whether the top surface of the four face positioning blocks 39 leaks, if there is no leakage, it means that the large bottom surface of the valve cover product has no gap with the top surface of the face positioning block 39, and the positioning is correct. At this point, the positioning and clamping of the valve cover product in the second clamping mechanism are completed. The vertical machining center starts to process the top surface and holes, two short sides and holes of the valve cover product. If leakage is found during air detection, it means that the large bottom surface of the valve cover product has a gap with the top surface of the face positioning block 39, and the positioning is not correct, and the valve cover product needs to be removed.

[0079] After processing is completed, use external blowing equipment to remove waste chips, cutting fluid and other residues on the clamp and valve cover product. Manually start the hydraulic release of the machining center, the top heads of all second external thread type support cylinders 42 are retracted to the initial position, and all third lever clamping cylinders 40 rotate the third pressure plate 41 to retract to the initial position. Take out the valve cover product, clean it, and thus the valve cover product is processed into a finished product.

[0080] When the valve cover finished product is detected to be qualified, enter the formal processing stage, after the valve cover product processed by the first clamping mechanism is loaded into the second clamping mechanism, the first clamping mechanism will also load the next valve cover blank, and the specific clamping operation repeats the above steps; then run the machining program, and process two valve cover products at the same time. Every time the machining program is run, a valve cover finished product is produced, and the processing integration is very high, which is an optimal solution for processing valve cover products. The control process of each hydraulic actuator of the clamp of the utility model:

[0081] One, the three hydraulic oil inlet pipes and one hydraulic oil outlet pipe of the vertical machining center are connected to the rotary joint of the four-axis 46, the hydraulic oil passes through the rotary joint, and finally enters and exits from the oil passage of the first clamping mechanism, thereby controlling the hydraulic actuator of the first clamping mechanism.

[0082] Firstly, one hydraulic oil inlet pipe inputs hydraulic oil, which enters two small-sized push cylinders 20 from one branch and enters the first sequence valve (installed on the connecting oil passage of the bridge plate oil inlet and the large-sized push cylinder 25) from the other branch. When the two small-sized push cylinders 20 complete the action, the first sequence valve is opened, and the hydraulic oil enters the large-sized push cylinder 25.

[0083] Secondly, when the large-sized push cylinder 25 completes the action, the double-point positioning and single-point positioning of the valve cover product are completed. The second hydraulic oil inlet pipe inputs hydraulic oil, which enters the left upper, right upper, and right lower three first lever clamping cylinders 28.

[0084] Finally, when the three first lever clamping cylinders 28 complete the clamping action, the main clamping of the valve cover product is completed.

[0085] The third hydraulic oil inlet pipe inputs hydraulic oil, which enters one flange support cylinder 29 and nine first external thread type support cylinders 30 from one branch and enters the second sequence valve (installed on the connecting oil passage of the bridge plate oil inlet and the second lever clamping cylinder 31) from the other branch. When all the flange support cylinders 29 and the first external thread type support cylinders 30 complete the action, the second sequence valve is opened, and the hydraulic oil enters the left lower second lever clamping cylinder 31. When the second lever clamping cylinder 31 completes the clamping action, all the clamping of the valve cover product is completed, and at this time, the clamping of the valve cover product in the first clamping mechanism is also completed.

[0086] After the valve cover product completes the machining, firstly, the pressure of the hydraulic oil in the aforementioned hydraulic oil inlet pipe is removed. At this time, the first pressure plate 16 of the three first lever clamping cylinders 28 and the second pressure plate 18 of the second lever clamping cylinder 31 lose the clamping force, and the L-shaped pressure rod of all the small-sized push cylinders 20, the extended push column 26 of the large-sized push cylinder 25, and the top head of the flange support cylinder 29 and the first external thread type support cylinder 30 all retreat to the initial position. Then one hydraulic oil outlet pipe starts to input hydraulic oil into the three first lever clamping cylinders 28 and the second lever clamping cylinder 31, drives the three first lever clamping cylinders 28 and the second lever clamping cylinder 31 to complete the loosening action, and the first pressure plate 16 and the second pressure plate 18 retreat to the initial position. At this time, the valve cover product can be removed.

[0087] Second, the other hydraulic oil inlet pipe and a hydraulic oil outlet pipe of the vertical machining center are connected to the joint of the large base plate, and the hydraulic oil will pass through the oil path inside the large base plate and the rotary joint inside the tail seat, and finally enter and exit the oil path of the second clamping mechanism, so as to control the hydraulic actuator of the second clamping mechanism. In addition, a compressed air pipe is connected to the rotary joint of the tail seat for air detection.

[0088] First, a hydraulic oil inlet pipe inputs hydraulic oil, which enters four third lever clamping cylinders 40 from one branch, and enters a third sequence valve (installed on the oil inlet of the second clamping mechanism base plate and the connecting oil path of eight second external thread type support cylinders 42) from another branch. When the four third lever clamping cylinders 40 complete the clamping action, the third sequence valve opens, and hydraulic oil enters the eight second external thread type support cylinders 42. When the eight second external thread type support cylinders 42 complete the action, the clamping of the valve cover product in the second clamping mechanism is completed.

[0089] Second, a compressed air pipe inputs compressed air, which passes through the rotary joint of the tail seat, the internal air path of the clamp, and finally reaches the small air hole on the top surface of the face positioning block 39. If there is no air leakage at this time, it means that the large bottom surface of the valve cover product and the top surface of each face positioning block 39 are completely matched and positioned correctly, and subsequent machining can be performed. If air leakage occurs, it means that there is a gap between the large bottom surface of the valve cover product and the top surface of each face positioning block 39, and the face positioning is incorrect, and the valve cover product needs to be re-clamped after the cause is found.

[0090] After the valve cover product is machined, first, the pressure of the hydraulic oil in the hydraulic oil inlet pipe mentioned earlier is removed, at which time the third pressure plate 41 on the four third lever clamping cylinders 40 loses the clamping force, and the top head of all second external thread type support cylinders 42 retreats to the initial position. Then a hydraulic oil outlet pipe begins to input hydraulic oil into the four third lever clamping cylinders 40, driving the four third lever clamping cylinders 40 to complete the loosening action, and the third pressure plate 41 retreats to the initial position. At this time, the valve cover product can be removed.

[0091] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not limited thereto. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can be made to the technical solutions described in the foregoing embodiments, or some or all of the technical features can be replaced equivalently, without changing the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A double-sided hydraulic clamp for valve cover machining, characterized by, The utility model relates to a four-axis clamp, including: Clamp base plate (43), four shafts (46), tailstock (48), first clamping mechanism and second clamping mechanism; Four shafts (46) and tailstock (48) are arranged respectively on the clamp base plate (43), and a bridge plate (45) is arranged between the four shafts (46) and the tailstock (48);The output end of the four shafts (46) is connected with the bridge plate (45); One side of the bridge plate (45) is provided with the first clamping mechanism, and the other side is provided with the second clamping mechanism; The first clamping mechanism comprises a single-point surface positioning block (2), a double-point surface positioning block (4), a double-point positioning seat (9), a single-point positioning seat (14), a positioning block (15), a large-size push cylinder (25), an extended push column (26), a second pressing plate (18), three first pressing plates (16) and two small-size push cylinders (20) arranged on the bridge plate (45); The double-point positioning seat (9) is provided with a left positioning block (10) and a right positioning block (12); The left end inner side of the double-point positioning seat (9) is sequentially provided with the second pressing plate (18), the single-point surface positioning block (2), a first pressing plate (16) and a small-size push cylinder (20);The second pressing plate (18) can rotate;The outer side of the single-point surface positioning block (2) is provided with the extended push column (26);The extended push column (26) is arranged at the telescopic end of the large-size push cylinder (25); The right end inner side of the double-point positioning seat (9) is sequentially provided with a first pressing plate (16), a positioning block (15), a first pressing plate (16) and a small-size push cylinder (20);The positioning block (15) is arranged at the inner side of the single-point positioning seat (14);The inner side of the positioning block (15) is provided with the double-point surface positioning block (4);The double-point surface positioning block (4) is provided with an upper positioning surface (5) and a lower positioning surface (7); Three first pressing plates (16) can rotate;The telescopic rod of one of the small-size push cylinders (20) is hinged with a left L-shaped pressing rod (21), and the telescopic rod of the other small-size push cylinder (20) is hinged with a right L-shaped pressing rod (22); The second clamping mechanism comprises a second clamping mechanism base plate and a cylindrical pin (36), a rhombic pin (38), two guide rods (34), four surface positioning blocks (39) and four third lever clamping cylinders (40) arranged on the second clamping mechanism base plate; The second clamping mechanism base plate is fixed on the bridge plate (45), and the four third lever clamping cylinders (40) are distributed in a rectangular shape on the second clamping mechanism base plate;One third pressing plate (41) is arranged on each third lever clamping cylinder (40);One surface positioning block (39) is arranged below each third pressing plate (41);Air holes are left on the surface positioning block (39); The cylindrical pin (36) is arranged at the outer side of the upper left surface positioning block (39), and the rhombic pin (38) is arranged at the outer side of the lower right surface positioning block (39); One guide rod (34) is arranged between the left two third pressing plates (41), and the other guide rod (34) is arranged between the right two third pressing plates (41).

2. The double-sided hydraulic fixture for valve cover machining according to claim 1, characterized in that, The clamp base plate (43) is provided with four shafts (46) and tailstock (48) through the gasket (44) respectively. The four-axis lug (47) of the four-axis (46) is connected with one end of the bridge plate (45), and the tail seat lug (49) of the tail seat (48) is connected with the other end of the bridge plate (45).

3. The double-sided hydraulic fixture for valve cover machining according to claim 2, characterized in that, Three first pressing plates (16) are rotatably arranged through first lever clamping cylinders (28) respectively; The second pressing plate (18) is rotatably arranged through a second lever clamping cylinder (31); The second lever clamping cylinder (31) and the three first lever clamping cylinders (28) are respectively installed on the bridge plate (45).

4. The double-sided hydraulic fixture for valve cover machining according to claim 3, characterized in that, The bridge plate (45) is provided with a rear flange type support cylinder (29) and nine first external thread type support cylinders (30).

5. The double-sided hydraulic fixture for valve cover machining according to claim 1, characterized in that, The top end of the single-point surface positioning block (2) is provided with a crescent groove.

6. The double-sided hydraulic fixture for valve cover machining according to claim 1, characterized in that, The lower part of the front end of the second pressing plate (18) and the three first pressing plates (16) adopts an arc surface; The front end of the second pressing plate (18) and the three first pressing plates (16) adopts a folded structure; The front end of the second pressing plate (18) and the three first pressing plates (16) are chamfered.

7. The double-sided hydraulic fixture for valve cover machining according to claim 1, characterized in that, Two second external thread type support cylinders (42) are distributed on both sides of each guide rod (34).

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