Double-sided hydraulic clamp for valve cover machining

Abstract

The invention 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 invention relates to the technical field of mechanical processing fixtures, and in particular to a double-sided hydraulic fixture used for valve cover processing. Background Art

[0002] Solenoid valves are basic automation components used to control fluids. With the demand for more functions in industrial control systems, solenoid valves are constantly being updated, especially the valve cover, which is more complex. The valve cover is directly connected to each actuator. In order to achieve multi-functional control, more control holes are added, which makes the internal structure of the valve cover more and more complicated, bringing difficulties to processing.

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

[0004] At present, valve cover processing generally adopts three processes. The first process processes the large bottom surface and holes on the vertical machining center, the second process also processes the top surface and holes on the vertical machining center, and the third process processes the outer peripheral surface and holes on the horizontal machining center. This processing method requires the installation of fixtures on the vertical machining center and the horizontal machining center respectively, which has high equipment costs. In addition, the valve cover needs to be turned over many times during the processing process, and the valve cover clamping and turnover process is cumbersome. The valve cover production occupies a lot of equipment, resulting in low valve cover production efficiency and high costs. Summary of the invention

[0005] The present invention mainly solves the technical problems that the prior art needs to equip the vertical machining center and the horizontal machining center with fixtures respectively, the equipment cost is high, and the valve cover clamping and turnover process are cumbersome. A double-sided hydraulic fixture for valve cover processing is proposed. Through a set of fixtures, all processes of the valve cover product are combined into one process to complete, so that all processing contents of the valve cover product can be completed on a vertical machining center, and the loading and unloading of products is convenient, fast, efficient, stable and reliable.

[0006] The present invention provides a double-sided hydraulic clamp for valve cover machining, comprising: a clamp base plate, four axes, a tailstock, a first clamping mechanism and a second clamping mechanism;

[0007] Four axes and a tailstock are respectively arranged on the bottom plate of the fixture; a bridge plate is arranged between the four axes and the tailstock; and the output end of the four axes is connected to the bridge plate;

[0008] A first clamping mechanism is installed on one side of the bridge plate, and a second clamping mechanism is installed on the other side;

[0009] The first clamping mechanism includes: 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-sized push cylinder, an extended push column, a second pressing plate, three first pressing plates, and two small-sized push 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 left inner side of the double-point positioning seat is provided with a second pressing plate, a single-point surface positioning block, a first pressing plate and a small-sized push cylinder in sequence; the second pressing plate is rotatable; an extended push column is provided on the outer side of the single-point surface positioning block; the extended push column is provided at the telescopic end of the large-sized push cylinder;

[0012] A first pressing plate, a positioning block, a first pressing plate and a small-sized push cylinder are sequentially arranged on the inner side of the right end of the double-point positioning seat; the positioning block is arranged on the inner side of the single-point positioning seat; a double-point surface positioning block is arranged on the inner side of the positioning block; the double-point surface positioning block has an upper side positioning surface and a lower side positioning surface;

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

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

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

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

[0017] A guide rod is arranged between the two third pressing plates on the left side, and another guide rod is arranged between the two third pressing plates on the right side.

[0018] Preferably, the fixture bottom plate is provided with four axes and a tailstock respectively through a pad;

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

[0020] Preferably, the three first pressing plates are rotatably arranged through the 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 mounted on the bridge plate.

[0023] Preferably, a rear flange type support cylinder and nine first external thread type support cylinders are arranged on the bridge plate.

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

[0025] Preferably, the lower parts of the front ends of the second pressing plate and the three first pressing plates are arc-shaped;

[0026] The front ends of the second pressing plate and the three first pressing plates adopt a folding structure;

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

[0028] Preferably, two second externally threaded support cylinders are distributed on both sides of each guide rod.

[0029] The double-sided hydraulic clamp for valve cover processing provided by the present invention can be used for processing on a vertical machining center with four axes and hydraulic multi-input and multi-output. A bridge plate is set between the four axes and the tailstock. First, the valve cover product is clamped horizontally on one side of the bridge plate with the large bottom surface facing upward, mainly to complete the processing of the large bottom surface and the hole and the two long side surfaces and the hole; then the valve cover product is clamped vertically on the other side of the bridge plate with the top surface facing upward, mainly to complete the processing of the top surface and the hole and the two short side surfaces and the hole. Through the application of a set of double-sided hydraulic clamps of the present invention, all the processes of the valve cover product are combined into one process to complete, reducing the equipment cost; it is realized that all the processing contents of the valve cover product are completed on a vertical machining center. Compared with the previous three machining centers required to complete the processing of the valve cover product, the present invention has a breakthrough improvement, the production efficiency has been significantly improved, and the processing cost has been significantly reduced.

[0030] In summary, the fixture solution of the present invention can be applied to most four-axis vertical machining centers, can be widely used, and can fundamentally solve the above-mentioned problems. The present invention is easy to load and unload, stable and reliable, and has strong versatility and extensiveness; it is not only suitable for valve cover products, but also suitable for milling, drilling, tapping, boring and other processing of most thin cover products. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 The structure of the valve cover to be processed in the present invention is shown in FIG. Figure 1 (lateral top surface angle);

[0032] Figure 2 The structure of the valve cover to be processed in the present invention is shown in FIG. Figure 2 (lateral large bottom angle);

[0033] Figure 3 The structure of the valve cover to be processed in the present invention is shown in FIG. Figure 3 (vertical top angle);

[0034] Figure 4 The structure of the valve cover to be processed in the present invention is shown in FIG. Figure 4 (vertical large base angle);

[0035] Figure 5 It is a structural schematic diagram of a double-sided hydraulic clamp for valve cover processing provided by the present invention;

[0036] Figure 6 It is a schematic diagram of the clamping state of the double-sided hydraulic clamp for valve cover processing provided by the present invention;

[0037] Figure 7 is a structural schematic diagram of a first clamping mechanism provided by the present invention;

[0038] Figure 8 is a schematic diagram of the clamping state of the first clamping mechanism provided by the present invention;

[0039] Fig. 9 is a structural schematic diagram of a second clamping mechanism provided by the present invention;

[0040] Fig.10 It is a schematic diagram of the clamping state of the second clamping mechanism provided by the present invention.

[0041] Figure numerals: 1, first contact surface; 2, single-point surface positioning block; 3, second contact surface; 4, double-point surface positioning block; 5, upper side positioning surface; 6, third contact surface; 7, lower side 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-sized push cylinder; 21, left L-shaped pressure rod; 22, right L-shaped pressure rod; 23, seventh contact surface; 24, eighth contact surface; 25 , large-size push cylinder; 26, extended push column; 27, the ninth contact surface; 28, the first lever clamping cylinder; 29, flange support cylinder; 30, the first external thread support cylinder; 31, the second lever clamping cylinder; 32, the first hole; 33, the second hole; 34, the guide rod; 35, the first positioning hole; 36, the cylindrical pin; 37, the second positioning hole; 38, the diamond pin; 39, the surface positioning block; 40, the third lever clamping cylinder; 41, the third pressure plate; 42, the second external thread support cylinder; 43, the fixture bottom plate; 44, the pad; 45, the bridge plate; 46, the four-axis; 47, the four-axis ear plate; 48, the tailstock; 49, the tailstock ear plate. DETAILED DESCRIPTION

[0042] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for the convenience of description, only the parts related to the present invention are shown in the accompanying drawings, rather than all the contents.

[0043] like Figure 5-6 As shown, a double-sided hydraulic clamp for valve cover processing provided by an embodiment of the present invention includes: a clamp base plate 43, a four-axis 46, a tailstock 48, a first clamping mechanism and a second clamping mechanism.

[0044] Four axes 46 and a tailstock 48 are respectively arranged on the fixture bottom plate 43; the four axes 46 and the tailstock 48 are respectively arranged on the fixture bottom plate 43 through the pad 44. The pad 44 plays a role of heightening. When the valve cover products are clamped on both sides of the bridge plate 45, if the height is not enough, the valve cover products may hit the large bottom plate during the rotation of the four axes 46. The setting of the pad 44 effectively solves this problem. In addition, the pad 44 is made of thickened steel plate, which has sufficient rigidity and has been tempered, providing a guarantee for stable processing. Rotary joints are respectively arranged at the outer ends of the four axes 46 and the tailstock 48; the rotary joint is a hydraulic component, which has multiple oil circuit joints and gas circuit joints.

[0045] A bridge plate 45 is arranged between the four-axis 46 and the tailstock 48; the output end of the four-axis 46 is connected to the bridge plate 45, and the four-axis 46 can drive the bridge plate 45 to rotate; specifically, the four-axis ear plate 47 of the four-axis 46 is connected to one end of the bridge plate 45, and the tailstock ear plate 49 of the tailstock 48 is connected to the other end of the bridge plate 45. A first clamping mechanism is installed on one side of the bridge plate 45, and a second clamping mechanism is installed on the other side.

[0046] like Figure 7-8 As shown, the first clamping mechanism includes: 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-sized push cylinder 25, an extended push column 26, a second pressing plate 18, three first pressing plates 16, and two small-sized push cylinders 20;

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

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

[0049] A first pressing plate 16, a positioning block 15, a first pressing plate 16 and a small-sized push cylinder 20 are sequentially arranged on the inner side of the right end of the double-point positioning seat 9; the positioning block 15 is arranged on the inner side of the single-point positioning seat 14; a double-point surface positioning block 4 is arranged on the inner side of the positioning block 15; the double-point surface positioning block 4 has an upper side positioning surface 5 and a lower side positioning surface 7;

[0050] The three first pressing plates 16 are rotatable; the telescopic rod of one of the small-sized push cylinders 20 is hinged to the left L-shaped pressure rod 21, and the telescopic rod of the other small-sized push cylinder 20 is hinged to the right L-shaped pressure rod 22; the left L-shaped pressure rod 21 is also hinged to the articulated seat installed on the corresponding small-sized push cylinder 20, and the end of the left L-shaped pressure rod 21 faces the single-point surface positioning block 2; the right L-shaped pressure rod 22 is also hinged to the articulated seat installed on the corresponding small-sized push cylinder 20, and the end of the right L-shaped pressure rod 22 faces the double-point surface positioning block 4;

[0051] The three first pressing plates 16 are rotatably arranged through the first lever clamping cylinder 28; the second pressing plate 18 is rotatably arranged through the second lever clamping cylinder 31; the second lever clamping cylinder 31 and the three first lever clamping cylinders 28 are respectively mounted on the bridge plate 45, the first pressing plate 16 is mounted on the telescopic end of the first lever clamping cylinder 28; the second pressing plate 18 is mounted on 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 folding structure; the front end of the second pressing plate 18 and the three first pressing plates 16 is chamfered.

[0052] The bridge plate 45 is provided with a rear flange type support cylinder 29 and nine first externally threaded support cylinders 30. The first externally threaded support cylinders 30 are specifically installed on the bridge plate 45 via a double-point positioning seat 9 or a pad.

[0053] The first clamping mechanism of the present invention is mainly used to complete the processing of the large bottom surface and two long side surfaces of the valve cover. The side of the valve cover with a smaller width should be facing right. After clamping, the large bottom surface and two long side surfaces should be exposed without obstruction, which is convenient for subsequent processing. The first clamping mechanism can realize the surface positioning function, the two-point positioning function of the long side surface, the single-point positioning function of the short side surface, the clamping function, the support function, the floating support function, etc.

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

[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 long side of the lower part of the valve cover. Pillars are arranged on both sides of the double-point positioning seat 9, and the top of the pillars are 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, which has high hardness and good wear resistance after heat treatment, and improves the life of the fixture. The left positioning block 10 and the right positioning block 12 are respectively contacted with the blank surface of the lower long side for positioning. The ends of the left positioning block 10 and the right positioning block 12 are rounded and chamfered. The small area contact reduces the influence of large size variation of the blank surface, making the positioning more accurate. In addition, a left L-shaped pressure rod push cylinder seat and a right L-shaped pressure rod push cylinder seat are respectively arranged on the bridge plate 45 (corresponding to the two ends of the upper long side of the valve cover product), and a small-sized push cylinder 20 is respectively 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 ends of the left L-shaped pressure rod 2 and the right L-shaped pressure rod 22 can contact the blank surface of the upper long side, thereby pushing the valve cover product to move to the left positioning block 10 and the right positioning block 12 and clamping. The two push points are respectively facing the left positioning block 10 and the right positioning block 12, which makes the double-point positioning after clamping more accurate and reliable. The above design completes the double-point precise positioning.

[0056] The single-point positioning function of the short side is mainly realized by the single-point positioning seat 14. The single-point positioning seat 14 is arranged on the right fixed seat. A positioning block 15 is arranged on the upper left part of the single-point positioning seat 14, which contacts and positions the blank surface of the right short side. The single-point positioning seat 14 is made of alloy steel and has a very long service life. The end of the positioning block 15 is also rounded and chamfered, which can be positioned 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. A large-sized push cylinder 25 is arranged on the push cylinder seat, and an extended push column 26 is arranged on the large-sized push cylinder 25. The extended push column 26 can contact the blank surface of the left short side, thereby pushing the valve cover to move toward the positioning block 15 and clamp it. The push point is opposite to the positioning point, which makes the single-point positioning after clamping more accurate and reliable. The above design completes the single-point precise positioning.

[0057] The clamping design is difficult. The large bottom surface of the valve cover product needs to be processed to ensure that all the parts of the first clamping mechanism are lower than the large bottom surface of the valve cover. Otherwise, interference will occur when the face milling cutter processes the large bottom surface. The outer periphery of the large bottom surface is a whole surface without a concave platform, which makes it impossible to set the pressure plate in the concave platform according to the conventional design. In order to avoid interference, the clamping point can only be set in the casting hole of the short side surface on both sides. The difficulty is that the bottom of the casting hole is an arc surface, and the conventional pressure plate will press the air. For this reason, the lower part of the front end of the second pressure plate 18 and the three first pressure plates 16 is designed to be an arc surface, which solves the problem of pressing the air, and the clamping point is facing the positioning point of the single-point surface positioning block 2 and the double-point surface positioning block 4 of the valve body product, which can be firmly compacted. In addition, due to the small casting hole, the front end of the second pressure plate 18 and the three first pressure plates 16 is easy to scrape the casting hole during the flipping process. For this reason, the front end of the second pressure plate 18 and the three first pressure plates 16 is chamfered to achieve effective avoidance. Small push cylinders 20 are respectively arranged on the left and right fixed seats. The small push cylinders 20 use lever clamping cylinders. Since the mounting seat size of the large clamping force lever clamping cylinder is relatively large, their center distance is greater than the center distance of the short side casting holes on both sides. For this reason, the front ends of the second pressing plate 18 and the three first pressing plates 16 are designed to be folded structures, which enables the front end of the pressing plate to penetrate into the casting hole and clamp. The above design achieves a secure clamping of the valve cover product.

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

[0059] Since the valve cover is a thin cover product, there is no clamping and support in the middle part, which will inevitably vibrate during the processing and cause the processing size to be unqualified. For this reason, nine first external thread type support cylinders 30 are set to provide floating support for it. They are set on the left fixed seat, the right fixed seat, the double point positioning seat 9, the upper floating support cylinder seat, and the middle floating support cylinder seat. When the valve cover product is clamped, the tops of the nine first external thread type support cylinders 30 will rise and contact the blank surface of the valve cover, playing a comprehensive and effective supporting role, ensuring that subsequent processing can be smooth.

[0060] like Figure 9-10 As shown, the second clamping mechanism comprises: a second clamping mechanism bottom plate and a cylindrical pin 36, a diamond pin 38, two guide rods 34, four surface positioning blocks 39, and four third lever clamping cylinders 40 arranged on the second clamping mechanism bottom plate;

[0061] The second clamping mechanism bottom 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 bottom plate; a third pressing plate 41 is arranged on each third lever clamping cylinder 40; a surface positioning block 39 is arranged below each third pressing plate 41; an air hole is left on the surface positioning block 39; the air hole is connected to an external compressed air pipe through a tailstock 48 for performing air inspection.

[0062] The cylindrical pin 36 is arranged on the outer side of the surface positioning block 39 at the upper left, and the diamond pin 38 is arranged on the outer side of the surface positioning block 39 at the lower right;

[0063] A guide rod 34 is arranged between the two third pressing plates 41 on the left side, and another guide rod 34 is arranged between the two third pressing plates 41 on the right side. Two second externally threaded support cylinders 42 are respectively arranged on both sides of each guide rod 34, and the number of second externally threaded support cylinders 42 is eight in total.

[0064] The second clamping mechanism is mainly used to complete the processing of the top surface, two short side surfaces and holes. The side with a smaller width of the valve cover product should be facing downward, and the rear end surface and two short side surfaces should be exposed without obstruction after clamping, so as to facilitate subsequent processing. The second clamping mechanism has functions such as surface positioning, centering, rough guiding, clamping, and floating support.

[0065] The surface positioning function is mainly completed by the four surface positioning blocks 39 contacting the large bottom surface of the valve cover after processing. The large bottom surface of the valve cover after processing has a very good flatness and can effectively contact and position with the four surface positioning blocks 39 at the same time, without gaps and clamping deformation. In addition, the surface positioning block 39 is also designed with an air detection function. An air hole is provided on the top surface of the surface positioning block 39. When the large bottom surface is effectively contacted with the top surface of the surface positioning block 39 and clamped, all the air holes will be sealed. At this time, compressed air is opened to enter the surface positioning block 39, and no air leakage will occur. If the large bottom surface and the top surface of the surface positioning block 39 have poor contact due to poor processing of the large bottom surface or padding with waste chips, 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 and the top surface of the surface positioning block 39 are effectively contacted and positioned by checking whether there is air leakage. This air detection function can accurately and quickly determine, which is very practical and worth promoting.

[0066] The centering function is mainly completed by the cylindrical pin 36 and the diamond pin 38. They are centered with the holes with strict tolerances processed in the first clamping mechanism of the valve cover. The centering gap is very small. When the valve cover product is inserted into the cylindrical pin 36 and the diamond pin 38, its position is accurately fixed and there is no need to find the center 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. For this purpose, two guide rods 34 are set. They are roughly guided with the middle hole processed in the first clamping mechanism of the valve cover product. The guide gap is relatively large and easy to put in. Through the above design, the valve cover product can be easily placed in the second clamping mechanism, accurately and conveniently.

[0067] The clamping function is mainly completed by four third lever clamping cylinders 40, and the third pressure plate 41 on it is directly pressed into the concave platform of the valve cover product. After clamping, the highest points of the third pressure plates 41 of the four third lever clamping cylinders 40 are lower than the upper end surface of the valve cover product, which is convenient for subsequent milling surface processing. In order to avoid vibration during processing, eight second external thread type support cylinders 42 are set on the fixed plate. When the valve cover product is clamped, the tops of the eight second external thread type support cylinders 42 will rise and contact with the large bottom surface of the valve cover product after processing, playing a comprehensive and effective supporting role, ensuring that subsequent processing can be smooth.

[0068] The above components are connected and fixed by positioning pins, hexagon socket screws, etc., and oil circuits are designed inside the bridge plate 45 and the bottom plate of the second clamping mechanism. The hydraulic oil supplied by the vertical machining center circulates inside the fixture, which is safer and more reliable.

[0069] The working process of a double-sided hydraulic clamp for valve cover processing provided by an embodiment of the present invention is as follows:

[0070] First, install the fixture on the workbench of the vertical machining center and tighten the hexagon socket screws. Connect and debug the four-axis 46 to ensure normal use. Then manually control the rotation of the four-axis 46 to rotate the first clamping mechanism upward. This completes the preparation work for clamping the valve cover product.

[0071] Place the valve cover blank horizontally into the first clamping mechanism, with the large bottom surface facing upward and the side with smaller width 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 insert the valve cover blank until the valve cover blank contacts and is positioned with 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 each positioning surface. 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, two small-sized push cylinders 20 push the left L-shaped pressure rod 21 and the right L-shaped pressure rod 22 to rotate around their respective fulcrums. The left L-shaped pressure rod 21 contacts the seventh contact surface 23 of the valve cover blank and pushes toward the left positioning block 10. The right L-shaped pressure rod 22 contacts the eighth contact surface 24 of the valve cover blank and pushes toward the right positioning block 12 until the valve cover blank contacts the left positioning block 10 and the right positioning block 12 and completes positioning. Then the large-sized push cylinder 25 pushes the extended push column 26 to contact the ninth contact surface 27 of the valve cover blank and pushes toward the positioning block 15 until the valve cover blank contacts the positioning block 15 and completes positioning.

[0073] Then the three first lever clamping cylinders 28 start to move, driving the three first pressing plates 16 to rotate, and their front ends extend into the first blank hole 17 and clamp the valve cover blank. After clamping, the flange type support cylinder 29 and the nine first external thread type support cylinders 30 start to move, raising their top heads to support the valve cover blank. Then the second lever clamping cylinder 31 starts to move, driving the second pressing plate 18 to rotate, and its front end extends into the second blank hole 19 and clamps 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 debugging and processing the large bottom surface and two long sides of the valve cover blank. After processing, use external blowing equipment to remove waste chips, cutting fluid and other residues on the fixture and valve cover products. Start the hydraulic release control button of the machining center, and all the L-shaped pressure rods of the small-sized push cylinders 20, the extended push columns 26 of the large-sized push cylinders 25, the flange-type support cylinders 29 and the tops of the first external threaded support cylinders 30 are retracted to the initial position, and all the first lever clamping cylinders 28 rotate the first pressure plate 16, and the second lever clamping cylinders 31 rotate the second pressure plate 18 to retract to the initial position. Take out the valve cover product, clean it, place it on the turntable, and wait to be loaded into the second clamping mechanism.

[0075] Then manually control the four-axis to rotate 180° so that the second clamping mechanism faces upward, which is convenient for clamping the valve cover product processed by the first clamping mechanism.

[0076] Place the valve cover product vertically into the second clamping mechanism, with the processed large bottom surface facing downward and the side with smaller width facing downward, so that 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, and the second positioning hole 37 corresponds to the diamond pin 38. Slowly insert the valve cover product. First, the valve cover product will be inserted into the guide rod 34 for rough positioning, and then the valve cover product will be easily inserted into the cylindrical pin 36 and the diamond pin 38. Finally, the large bottom surface will contact and be positioned with the four surface positioning blocks 39.

[0077] Manually start the hydraulic clamping of the machining center, and the four third lever clamping cylinders 40 start to move, driving the four pressure plates 41 to rotate and directly press into the concave platform of the valve cover product to complete the clamping of the valve cover product. Then the eight external thread type support cylinders 42 start to move, raising their heads to support the valve cover product.

[0078] Then manually start the compressed air for air inspection to observe whether there is any leakage on the top surface of the four surface positioning blocks 39. If there is no leakage, it means that there is no gap between the large bottom surface of the valve cover product and the top surface of the surface 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 begins to process the top surface and holes, two short sides and holes of the valve cover product. If leakage is found during the air inspection, it means that there is a gap between the large bottom surface of the valve cover product and the top surface of the surface positioning block 39, and it is not positioned correctly, and the valve cover product needs to be removed.

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

[0080] When the valve cover product is qualified after inspection, it enters 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. The specific clamping operation can repeat the above steps; then run the processing program to process two valve cover products at the same time. Each time the processing program is run, a valve cover product will be produced. The processing integration is very high, which is the preferred solution for processing valve cover products. The control process of each hydraulic actuator of the clamp of the present invention:

[0081] 1. Connect three hydraulic oil inlet pipes and one hydraulic oil outlet pipe of the vertical machining center to the rotary joint of the fourth axis 46. The hydraulic oil will pass through the rotary joint and finally enter and exit from the oil circuit of the first clamping mechanism, thereby controlling the hydraulic actuator of the first clamping mechanism.

[0082] First, a hydraulic oil inlet pipe inputs hydraulic oil, and the hydraulic oil enters two small-sized push cylinders 20 from one branch, and enters the first sequence valve (installed on the connecting oil line between the bridge plate oil inlet and the large-sized push cylinder 25) from another branch. When the two small-sized push cylinders 20 complete the action, the first sequence valve opens and the hydraulic oil enters the large-sized push cylinder 25.

[0083] Secondly, when the large-size 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, and the hydraulic oil enters the three first lever clamping cylinders 28 on the upper left, upper right and lower right.

[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, and the hydraulic oil enters a flange-type support cylinder 29 and nine first externally threaded support cylinders 30 from one branch, and enters the second sequence valve (installed on the connecting oil line between the bridge plate oil inlet and the second lever clamping cylinder 31) from another branch. When all the flange-type support cylinders 29 and the first externally threaded support cylinders 30 complete their actions, the second sequence valve opens, and the hydraulic oil enters the lower left second lever clamping cylinder 31. When the second lever clamping cylinder 31 completes the clamping action, all clamping of the valve cover product is completed, and the clamping of the valve cover product in the first clamping mechanism is also completed.

[0086] After the valve cover product is processed, first remove the pressure of the hydraulic oil in the hydraulic oil inlet pipe mentioned above. 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 their clamping force, and all the L-shaped pressure rods of the small-sized push cylinders 20, the extended push column 26 of the large-sized push cylinder 25, the flange-type support cylinder 29 and the top of the first external thread support cylinder 30 are all retracted to the initial position. After that, a hydraulic oil outlet pipe starts to input hydraulic oil, enters 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 are retracted to the initial position. At this time, the valve cover product can be removed.

[0087] Second, connect the other hydraulic oil inlet pipe and hydraulic oil outlet pipe of the vertical machining center to the joint of the large base plate. The hydraulic oil will pass through the oil circuit inside the large base plate and the tailstock rotary joint, and finally enter and exit from the oil circuit of the second clamping mechanism, thereby controlling the hydraulic actuator of the second clamping mechanism. In addition, connect a compressed air pipe to the rotary joint of the tailstock to perform air inspection.

[0088] First, a hydraulic oil inlet pipe inputs hydraulic oil, and the hydraulic oil enters four third lever clamping cylinders 40 from one branch, and enters the third sequence valve (installed on the connecting oil line between the oil inlet of the bottom plate of the second clamping mechanism and the eight second externally threaded support cylinders 42) from another branch. When the four third lever clamping cylinders 40 complete the clamping action, the third sequence valve opens, and the hydraulic oil enters the eight second externally threaded support cylinders 42. When the eight second externally threaded support cylinders 42 complete the action, the valve cover product is clamped in the second clamping mechanism.

[0089] Secondly, a compressed air pipe inputs compressed air, which passes through the rotary joint of the tailstock and the internal air path of the fixture, and finally reaches the small air hole on the top surface of the surface positioning block 39. If there is no leakage at this time, it proves that the large bottom surface of the valve cover product and the top surface of each surface positioning block 39 are completely fitted and correctly positioned, and subsequent processing can be carried out. If 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 surface positioning block 39, and the surface positioning is wrong. It is necessary to find the cause and re-clamp the valve cover product.

[0090] After the valve cover product is processed, the pressure of the hydraulic oil in the hydraulic oil inlet pipe mentioned above is first removed. At this time, the third pressure plate 41 on the four third lever clamping cylinders 40 loses the clamping force, and the tops of all the second external threaded support cylinders 42 return to the initial position. After that, a hydraulic oil outlet pipe starts to input hydraulic oil, enters the four third lever clamping cylinders 40, drives the four third lever clamping cylinders 40 to complete the loosening action, and the third pressure plate 41 returns 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 invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that modifying the technical solutions described in the aforementioned embodiments, or replacing some or all of the technical features therein by equivalents, does not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

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

2. The double-sided hydraulic clamp for valve cover processing according to claim 1, characterized in that: The fixture bottom plate (43) is provided with four axes (46) and a tailstock (48) respectively through a backing plate (44); The four-axis ear plate (47) of the four-axis (46) is connected to one end of the bridge plate (45), and the tailstock ear plate (49) of the tailstock (48) is connected to the other end of the bridge plate (45).

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

4. The double-sided hydraulic clamp for valve cover machining according to claim 3, characterized in that: A rear flange type support cylinder (29) and nine first external thread type support cylinders (30) are arranged on the bridge plate (45).

5. The double-sided hydraulic clamp for valve cover machining according to claim 1, characterized in that: A crescent groove is arranged at the top end of the single-point surface positioning block (2).

6. The double-sided hydraulic clamp for valve cover machining according to claim 1, characterized in that: The lower parts of the front ends of the second pressing plate (18) and the three first pressing plates (16) are arc surfaces; The front ends of the second pressing plate (18) and the three first pressing plates (16) adopt a folding structure; The front ends of the second pressing plate (18) and the three first pressing plates (16) are chamfered.

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

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