An automatic assembly machine for piston rod assembly

Abstract

The application discloses an automatic assembling machine for piston rod assembly, comprising a rack and a connecting seat locking device, a piston rod clamping device, a sealing assembly detection device, a limiting gasket locking device, a nut locking detection device, a lifting device, a translation device and a central control unit arranged on the rack; the central control unit can control all actions of the connecting seat locking device, the piston rod clamping device, the sealing assembly detection device, the limiting gasket locking device, the nut locking detection device, the lifting device and the translation device. The application has the beneficial effects that: through the automatic design of the cooperation of multiple devices, the high precision, high efficiency and high reliability of the piston rod assembly are realized, and the problems of low efficiency, poor precision and easy damage in traditional manual assembly are effectively solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automation equipment, and in particular to an automatic assembly machine for piston rod assembly. BACKGROUND

[0002] As a core transmission component in hydraulic systems and pneumatic systems, the assembly precision of the piston rod and the connecting components such as the lifting ring, the limiting gasket and the nut directly affects the sealing performance, reliability and service life of the system. The traditional piston rod assembly process mainly relies on manual operation or semi-automatic equipment with single function, and the following problems exist:

[0003] Firstly, the assembly efficiency is low and the consistency is poor. When manually tightening the lifting ring, the limiting gasket and the nut, the tightening torque depends on the experience of the operator, and problems such as thread galling due to over-tightening or loose connection due to over-looseness may occur. At the same time, manual switching of workstations is required for multiple processes, which is time-consuming and labor-intensive, and it is difficult to meet the demand of large-scale production.

[0004] Secondly, the detection link is missing or the reliability is insufficient. The key quality points such as whether the sealing assembly is assembled in place and whether the nut is loose are mainly detected by manual visual inspection or simple tool detection in the traditional method, and the probability of missed detection or misjudgment is high, which cannot guarantee the stability of product quality. Moreover, the detection and assembly processes are separated, which requires additional time and equipment resources.

[0005] Thirdly, the equipment adaptability and protection are insufficient. The existing semi-automatic equipment is mainly designed for specific specifications of piston rods, and it needs to be re-adjusted or even replaced with a jig when different models of products are replaced, which has poor flexibility. At the same time, during the assembly process, the axial position error between the piston rod and the jig may easily cause a rigid collision, resulting in surface damage of the components or equipment failure, and increasing the maintenance cost.

[0006] Fourthly, the multi-process coordination capability is weak. The traditional equipment usually only has a single locking function, and the auxiliary actions such as lifting and translation need to be adjusted manually or rely on additional equipment, which leads to complex production line layout, large floor area, low efficiency of process connection, and difficulty in realizing full-process automatic control.

[0007] Therefore, it is necessary to develop a new type of tightening equipment that integrates multiple stations, automatic control, high-precision detection and self-adaptive protection, in order to improve the quality, efficiency and reliability of piston rod assembly. The present application is a solution to the above problems. SUMMARY

[0008] The technical problem solved by the present application is to provide an automatic assembly machine for piston rod assembly, which solves one or more of the above technical problems.

[0009] To solve the above technical problems, the application adopts one technical scheme: an automatic assembly machine for piston rod assembly, which is characterized in that: comprising a rack and a connecting seat locking device, a piston rod clamping device, a sealing assembly detection device, a limiting gasket locking device, a nut locking detection device, a lifting device, a translation device and a central control unit arranged on the rack; the connecting seat locking device is arranged at the bottom of the rack, the lifting device is arranged on the rear side wall of the inner chamber of the rack, the lifting plate capable of sliding up and down controlled by the lifting device is arranged on the lifting device, the translation device is arranged on the lifting plate, the translation frame capable of translating controlled by the translation device is arranged on the translation device, the mounting rack is arranged on the translation frame, and the limiting gasket locking device and the nut locking detection device are arranged on the mounting rack; the mounting table is arranged on the rear side of the connecting seat locking device on the rack, the piston rod clamping device is arranged on the mounting table, the mounting bracket is arranged on the mounting table, and the sealing assembly detection device is arranged on the mounting bracket; the central control unit can control all actions of the connecting seat locking device, the piston rod clamping device, the sealing assembly detection device, the limiting gasket locking device, the nut locking detection device, the lifting device and the translation device; the central control unit adopts a PLC controller, communicates with the servo motors, sensors and cylinder electromagnetic valves of each device through a CAN bus, and realizes automatic coordination of all actions such as torque control of the connecting seat locking device, position closed-loop control of the lifting device and signal acquisition of the sealing assembly detection device; the working process is as follows: the lifting ring is pre-assembled at the bottom of the piston rod, the sealing assembly is assembled at the middle part of the piston rod, then the lifting ring is placed at the specified position of the connecting seat locking device, the piston rod clamping device clamps the piston rod, the sealing assembly detection device detects whether the sealing assembly on the piston rod is in place, the connecting seat locking device rotates to complete the locking of the lifting ring and the piston rod after confirming that the sealing assembly is in place, the limiting gasket is manually sleeved on the piston rod, the lifting device and the translation device are moved in cooperation to make the limiting gasket locking device located directly above the piston rod, the lifting device controls the limiting gasket locking device to move downward to the work station to lock the limiting gasket and the piston rod, after completion, the lifting device moves upward, the nut is pre-assembled at the top of the piston rod by hand, the translation device moves the nut locking detection device to the piston rod directly above, the lifting device controls the nut locking detection device to move downward to the work station to complete the locking and detection of the nut (locking first and then detection), finally, the connecting seat locking device is reversely rotated to reset, the piston rod clamping device releases the piston rod, and the completed assembled piston rod is taken away by hand to enter the next cycle.

[0010] In some embodiments, the connecting seat locking device comprises:

[0011] The first base is provided with a first partition a and a first partition b, which divide the first base into a first lower layer, a first middle layer and a first upper layer arranged in sequence from bottom to top; the first partition a is provided with a first bearing seat a and a first bearing seat b, and the first partition b is provided with a first bearing seat c located directly above the first bearing seat a; a first transmission assembly includes a first torsion sensor, the upper part of which is assembled with the first bearing seat c and the top end thereof penetrates upward into the first upper layer, and the lower part thereof is assembled with the first bearing seat a and the bottom end thereof penetrates downward into the first lower layer, and the bottom end is provided with a first conversion gear a; a first power assembly includes a first speed reducer assembled on the first bearing seat b and located in the first middle layer, the output shaft of which penetrates downward into the first lower layer, the input shaft of which is connected to a first servo motor, and the output shaft is provided with a first conversion gear b located in the first lower layer; the first conversion gear a and the first conversion gear b are engaged with each other; a first up-down floating assembly is arranged at the top of the first torsion sensor and located in the first upper layer, and includes a first fixed seat and a first floating seat arranged coaxially, the first fixed seat is provided with a first spring groove, and the groove is provided with a first spring fixed at one end of the groove bottom and at the other end connected with the top of the first floating seat; a lifting ring fixing jig is arranged on the first floating seat and includes a first support and a first lifting ring insertion column, and the first support is provided with at least one first installation groove for assembling the first lifting ring insertion column.

[0012] In some embodiments, the piston rod holding device comprises:

[0013] The front edge of the second bottom plate is provided with a second hinge shaft a;

[0014] The second holding clamp includes a second clamp arm a and a second clamp arm b assembled on the second hinge shaft a and capable of being opened and closed therearound; the inner side of the second clamp arm a is provided with a second insertion slot a, and the slot is provided with a second holding sleeve a; the inner side of the second clamp arm b is provided with a second insertion slot b, and the slot is provided with a second holding sleeve b; a second reset assembly is arranged on the second bottom plate and located outside the second clamp arm a, and includes a second reset block and a second reset spring, one end of the second reset spring is fixed with the second reset block, and the other end is fixed with the outer edge of the second clamp arm a; a second limiting assembly is arranged on the second bottom plate and located at the rear side of the second reset assembly, and includes a second limiting cylinder a and a second limiting block at the output end thereof, the front edge of the second limiting block abuts against the rear side of the second clamp arm a, and the contact corner thereof is in the form of a circular arc; a second holding power assembly is arranged on the second bottom plate and located at the rear side of the second limiting assembly, and includes a second oil cylinder fixed seat and a second holding oil cylinder assembled thereon, the output end of the second holding oil cylinder is hingedly connected with the end of the second clamp arm b, and the arm body of the second clamp arm b and the output end of the second holding oil cylinder form a connecting rod structure.

[0015] In some embodiments, the sealing assembly detection device comprises at least two detection assemblies, each detection assembly comprising a third assembly column a and a third detector a assembled on the third assembly column a; the third detector a comprises a third detection head a and a third detection seat a for supporting the third detection head a, the third detection seat a is sleeved on the third assembly column a and can be adjusted in height and angle; the third detection seat a is provided with a third assembly hole a for sleeving the third assembly column a, and the front edge is provided with a third supporting plate a for supporting the third detection head a.

[0016] In some embodiments, the lifting device comprises:

[0017] A fourth supporting frame is provided on the fourth mounting plate;

[0018] A fourth motor seat is arranged on the top of the fourth mounting plate and is provided with a fourth lifting motor;

[0019] A fourth bearing seat a is arranged on the fourth mounting plate and located directly below the fourth motor seat and is provided with a fourth bearing a; a fourth bearing seat b is arranged on the fourth mounting plate and located directly below the fourth bearing seat a and is provided with a fourth bearing b; a fourth lead screw is assembled at one end with the fourth bearing a and at the other end with the fourth bearing b, and the top is connected with the output end of the fourth lifting motor; a fourth lead screw sleeve is assembled on the fourth lead screw; a fourth guide rail is arranged on the side of the fourth lead screw and is arranged in parallel, and is provided with a fourth guide block which can slide along the rail; the back surface of the lifting plate is fixedly connected with the fourth lead screw sleeve and the fourth guide block.

[0020] In some embodiments, the translation device comprises:

[0021] A fifth translation rail is provided with a fifth sliding block, and the translation frame is mounted on the fifth sliding block;

[0022] A fifth auxiliary rail is arranged on the upper side of the lifting plate and located above the fifth translation rail, and is provided with a fifth push block which can slide along the rail, and the front edge of the fifth push block is fixedly connected with the upper side of the translation frame; the fifth translation push cylinder a and the fifth translation push cylinder b are arranged on the two sides of the fifth auxiliary rail, and the output ends of the fifth translation push cylinder a and the fifth translation push cylinder b can abut against the fifth push block to move it; limit switches are arranged on the two sides of the lifting plate to limit the left and right translation of the translation frame.

[0023] In some embodiments, the limiting gasket locking device comprises:

[0024] The sixth power assembly comprises a sixth servo motor and a sixth speed reducer connected with the output end of the sixth servo motor;

[0025] The sixth transmission assembly is in butt joint with the output end of the sixth speed reducer, and comprises a sixth torsion sensor and a sixth assembly seat thereon; the sixth tightening jig head is assembled on the sixth assembly seat; the sixth up-down floating assembly is arranged between the sixth assembly seat and the sixth tightening jig head, and comprises a sixth fixed seat and a sixth floating seat arranged coaxially, the sixth fixed seat is provided with a sixth spring groove, and a sixth spring is arranged in the groove and fixed at one end to the groove bottom and at the other end to the top of the sixth floating seat.

[0026] In some embodiments, the nut locking detection device comprises a nut locking assembly and a nut detection assembly; the nut locking assembly comprises a seventh servo motor, a seventh speed reducer at the output end of the seventh servo motor, a seventh torsion sensor at the output end of the seventh speed reducer, a seventh nut tightening head at the output end of the seventh torsion sensor, and a seventh up-down floating assembly arranged between the seventh torsion sensor and the seventh nut tightening head; the seventh up-down floating assembly comprises a seventh fixed seat and a seventh floating seat arranged coaxially, the seventh fixed seat is provided with a seventh spring groove, and a seventh spring is arranged in the groove and fixed at one end to the groove bottom and at the other end to the top of the seventh floating seat; the nut detection assembly comprises an eighth loosening detection servo motor, an eighth speed reducer at the output end of the eighth loosening detection servo motor, and an eighth tightness detection head at the output end of the eighth speed reducer; the eighth tightness detection head comprises an eighth base and an eighth detection clamp hand assembled thereon.

[0027] The beneficial effects of the present application are: through the automatic design of multiple devices in cooperation, high precision, high efficiency and high reliability of the piston rod assembly are realized, and the problems of low efficiency, poor precision and easy damage in traditional manual assembly are effectively solved. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of these drawings.

[0029] Figure 1 is a structural schematic view of an automatic assembly machine for piston rod assembly.

[0030] Figure 2 is an axial view of the connecting seat locking device.

[0031] Figure 3 is a front view of the connecting seat locking device.

[0032] Figure 4 is a back view of the connecting seat locking device.

[0033] Figure 5 is a sectional view of the locking device of the connecting seat of the present application.

[0034] Figure 6 is an axial view of the piston rod holding device of the present application.

[0035] Figure 7 is a top view of the piston rod holding device of the present application.

[0036] Figure 8 is a structural schematic view of the sealing assembly detection device of the present application.

[0037] Figure 9 is a front view of the sealing assembly detection device of the present application.

[0038] Figure 10 is a structural schematic view of the limiting gasket locking device of the present application.

[0039] Figure 11 is a front view of the limiting gasket locking device of the present application.

[0040] Figure 12 is a structural schematic view of the nut locking detection device of the present application.

[0041] Figure 13 is a front view of the nut locking detection device of the present application.

[0042] Figure 14 is a structural schematic view of the lifting device of the present application.

[0043] Figure 15 is a front view of the lifting device of the present application.

[0044] Figure 16 is a structural schematic view of the translation device of the present application.

[0045] Figure 17 is a front view of the translation device of the present application. DETAILED DESCRIPTION

[0046] The technical solutions in the embodiments of the present application will be described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work, fall within the protection scope of the present application.

[0047] As Figure 1As shown, the embodiment of the present application comprises an automatic assembly machine for piston rod assembly, which is characterized in that high-precision assembly of the piston rod, the lifting ring, the limiting gasket and the nut is realized through multi-station coordinated automatic devices, and the detection function is integrated to ensure that each component is assembled in place. The technical solutions of the present application will be described in detail below in combination with the drawings and specific structures.

[0048] The rack 001 is the basic support structure of the device, and the bottom is equipped with a connecting seat locking device 100 for fixing and locking the lifting ring at the bottom of the piston rod; the rear side wall of the inner chamber of the rack 001 is provided with a lifting device 600, which drives the lifting plate 003 to slide up and down through a lead screw transmission; the lifting plate 003 is provided with a translation device 700, which drives the translation frame 004 to translate left and right through a double push cylinder; the mounting bracket 005 on the translation frame 004 integrates the limiting gasket locking device 400 and the nut locking detection device 500, and can adjust the position with the lifting plate 003 and the translation frame 004 to adapt to different station requirements. The mounting table is arranged on the rear side of the connecting seat locking device 100 on the rack 001, and the piston rod clamping device 200 (for clamping the main body of the piston rod) and the mounting bracket (the bracket is fixed with the sealing assembly detection device 300 for detecting the assembly state of the middle sealing assembly of the piston rod) are fixed on the table top.

[0049] As shown in Figures 2-5 The connecting seat locking device 100 is divided into three layers from bottom to top by the first base 110, the first partition a 111 and the first partition b 112, the bottom layer is arranged with a transmission assembly, the middle layer is arranged with a power assembly, and the top layer is arranged with a floating assembly and a lifting ring fixing jig.

[0050] The first bearing seat a 122 and the first bearing seat b 123 are arranged in parallel along the transverse direction on the first partition a 111, and the axes of the two are parallel with a spacing of 80mm; wherein the first bearing seat a 122 is located on the left side of the first partition a 111, and the first bearing seat b 123 is located on the right side, which are respectively used for assembling the lower bearing of the first torsion sensor 121 and the output shaft bearing of the first speed reducer 152; the first conversion gear a 125 and the first conversion gear b 126 are both spur gears with a module of 2.5 and a gear ratio of 1:1.2, and the meshing center distance is 60mm, which ensures that the power of the first servo motor 151 is transmitted to the first torsion sensor 121 without jamming through gear transmission.

[0051] Specifically: the first transmission assembly includes a first torsion sensor 121, the upper end of which is fixed to the top layer through a first bearing seat c124, and the lower end is fixed to the bottom layer through a first bearing seat a122, and the bottom extends out a first conversion gear a125; the first power assembly includes a first servo motor 151 and a first speed reducer 152, the output shaft of the first speed reducer 152 extends to the bottom layer and is connected with the first conversion gear b126, which is engaged with the first conversion gear a125, to transmit motor power to the first torsion sensor 121; the first bearing seat b123 is a deep groove ball bearing seat fixed on the first partition a111, the axis of which is parallel to the first bearing seat a122, used for assembling the output shaft bearing of the first speed reducer 152; the first up-down floating assembly is composed of a first fixed seat 131, a first floating seat 132 and a first spring 134, the first spring 134 can buffer the axial impact force when the lifting ring is locked with the piston rod, avoiding rigid collision; the first spring groove 133 is an annular groove opened on the top of the first fixed seat 131, with a groove depth of 15mm and an inner diameter matched with the first spring 134, used for limiting the axial displacement of the first spring 134; the first up-down floating assembly is located in the first upper layer, the bottom of which is connected with the top end of the first torsion sensor 121 through a key, and the top is bolted with the first support 141 of the lifting ring fixing jig; the lifting ring fixing jig fixes the lifting ring through the first support 141 and the first lifting ring insertion column 143, the first lifting ring insertion column 143 can be replaced according to the specifications of the lifting ring, with strong adaptability; the first installation groove 142 is three M12 threaded holes evenly distributed on the circumference of the first support 141, with a hole depth of 20mm, used for detachable installation of different specifications of the first lifting ring insertion column 143; the lifting ring fixing jig is located in the top center of the connecting seat locking device 100, and the axis thereof coincides with the axis of the first torsion sensor 121.

[0052] The first servo motor 151 drives the first torsion sensor 121 to rotate through gear transmission, driving the lifting ring to be connected with the piston rod in screw thread; the first torsion sensor 121 monitors the locking torque in real time, ensuring that it stops after reaching the set value, avoiding over-tightening or loosening; the first spring 134 of the floating assembly can compensate the axial position error of the lifting ring and the piston rod, improving the assembly accuracy.

[0053] As Figure 6 and Figure 7As shown, the piston rod clamping device 200 is based on the second bottom plate 210, and the second clamping arm a 221 and the second clamping arm b 222 are installed through the second hinge shaft a 211. The inner side of the clamping arm is respectively installed with the second clamping sleeve a 232 and the second clamping sleeve b 242 through the second slot a 231 and the second slot b 241 (the clamping sleeve is made of flexible material, which can avoid clamping the surface of the piston rod). The second reset assembly is composed of the second reset block 251 and the second reset spring 252, which ensures automatic reset when the clamping arm is released. The second limiting assembly includes the second limiting cylinder a 261 and the second limiting block 262. The arc design of the second limiting block 262 can avoid being stuck when the clamping arm is closed. The second clamping power assembly drives the second clamping arm b 222 to rotate around the hinge shaft through the second clamping cylinder 272, and closes the second clamping arm a 221 to clamp the piston rod. The second limiting cylinder a 261 is fixed on the right rear side of the second bottom plate 210 through bolts, and its output shaft extends horizontally forward, and the end is connected with the second limiting block 262. When the second clamping arm a 221 is closed, the arc corner of the second limiting block 262 contacts the protruding part on the rear side of the second clamping arm a 221, which limits the excessive rotation of the clamping arm. The arc radius is 15 mm, which ensures the accuracy of the closed position ±0.5 mm. The second clamping sleeve a 232 is made of polyurethane material and is embedded in the second slot a 231 through interference fit. The slot depth of the second slot a 231 is 20 mm. The inner side of the clamping sleeve is processed with an arc-shaped groove (radius R30 mm) matched with the outer circle of the piston rod, and is fixed with the side of the second clamping arm a 221 through a countersunk screw (M6x12) to prevent falling off. The second cylinder fixing seat 271 is an L-shaped steel plate support welded on the second bottom plate 210, with a thickness of 10 mm. A waist-shaped hole is provided on it to adjust the installation position of the second clamping cylinder 272.

[0054] The second clamping cylinder 272 pushes the second clamping arm b 222 to close, and applies uniform pressure to the piston rod through the second clamping sleeve a 232 and the second clamping sleeve b 242, which ensures that it is stable and does not deviate during locking. The design of the second reset spring 252 and the second limiting block 262 improves the reliability and repeat positioning accuracy of the device.

[0055] As Figure 8 and Figure 9As shown, the sealing assembly detection device 300 includes at least two detection assemblies (two in this embodiment), each composed of a third assembly column a310, a third detection seat a320, and a third detection head a330. The third detection seat a320 is sleeved on the third assembly column a310 through the third assembly hole a321, and can slide up and down and rotate to adjust the angle, adapt to sealing assemblies of different heights and positions; the third detection head a330 (optional photoelectric sensor or contact sensor) is fixed to the front edge of the third detection seat a320 through the third support plate a, used for detecting whether the sealing assembly is installed in place; the two detection assemblies of the sealing assembly detection device 300 are distributed symmetrically along the piston rod axis, located above and below the sealing assembly (distance 120mm) respectively; the third assembly column a310 of each detection assembly is fixed vertically on the horizontal beam of the mounting bracket, and the detection direction of the third detection head a330 (using a diffuse reflection photoelectric sensor) is towards the central axis of the piston rod, with an adjustable detection distance range of 50-150mm, ensuring coverage of sealing assemblies of different diameters.

[0056] Multiple detection heads are used for synchronous detection to avoid misjudgment of a single detection point; the adjustable design of the third detection seat a320 makes it adapt to piston rods of different specifications, with strong universality; the detection signal is fed back to the central control unit in real time, and the equipment automatically alarms and stops when not in place, avoiding defective products from flowing into the next process.

[0057] As shown in Figure 14 and Figure 15 The lifting device 600 is fixed to the rear side wall of the rack 001 through the fourth support frame 610, and the fourth mounting plate 611 is provided with a fourth motor seat 620 (installing a fourth lifting motor 621), a fourth bearing seat a630 (assembling a fourth bearing a631), and a fourth bearing seat b640 (assembling a fourth bearing b641); the fourth lead screw 650 is assembled with the fourth bearing a631 and the fourth bearing b641 at both ends respectively, and the top is connected with the output end of the fourth lifting motor 621; the fourth lead screw 650 is sleeved with a fourth lead screw sleeve 651; the fourth guide rail 660 is arranged in parallel with the fourth lead screw 650, and the fourth guide block 661 is slidably connected to the fourth guide rail 660; the fourth guide rail 660 is provided with two, located on the left and right sides of the fourth lead screw 650, and the three are parallel to each other and have equal spacing (the center of the fourth lead screw 650 is 100mm away from the center of the two side guide rails); two fourth guide blocks 661 are assembled on each guide rail, and are rigidly connected to the back of the lifting plate 003 through bolts, ensuring that the perpendicularity error of the lifting plate 003 is ≤0.1mm / m when moving up and down; the fourth lead screw sleeve 651 and the fourth guide block 661 are fixed to the back of the lifting plate 003, and move up and down with the fourth lead screw 650.

[0058] The screw-sleeve transmission structure has high precision and strong load capacity. The fourth guide rail 660 and the fourth guide block 661 are designed to avoid rotation of the lifting plate 003 and ensure vertical movement. The fourth lifting motor 621 can accurately control the lifting speed and displacement, meeting the height requirements of different stations.

[0059] As shown in Figure 16 and Figure 17 , the fifth translation rail 710 of the translation device 700 is fixed to the lifting plate 003, and the translation frame 004 is connected to the fifth translation rail 710 through the fifth sliding block 711. The fifth auxiliary rail 721 is arranged parallel above the fifth translation rail 710, and the fifth pushed block 722 is connected to the fifth auxiliary rail 721. The fifth pushed block 722 is fixed to the upper edge of the translation frame 004. The fifth translation push cylinder a 731 and the fifth translation push cylinder b 732 are arranged opposite to each other on both sides of the fifth auxiliary rail 721, and drive the fifth pushed block 722 to move left and right through the piston rod. The limit switch 740 is arranged on both sides of the lifting plate 003 to limit the movement range of the translation frame 004. The fifth translation push cylinder a 731 and the fifth translation push cylinder b 732 are double-acting cylinders with a cylinder diameter of 50 mm and a stroke of 200 mm. When the translation frame 004 needs to move left, the left cylinder retracts and the right cylinder extends to jointly push the fifth pushed block 722. When moving right, the opposite is true. The two cylinders work together to achieve stepless speed regulation of the translation frame 004 with a positioning accuracy of ±0.2 mm.

[0060] The fifth translation push cylinder a 731 and the fifth translation push cylinder b 732 work together to quickly push the translation frame 004 to move and accurately position. The limit switch 740 prevents overtravel and protects the equipment. The sliding block-guide rail structure has small friction and long service life, ensuring the stability of the translation movement.

[0061] As shown in Figure 10 and Figure 11 , the limit gasket locking device 400 is integrated on the mounting frame 005. The sixth power assembly is composed of a sixth servo motor 410 and a sixth speed reducer 411, which provides rotary power. The sixth transmission assembly includes a sixth torsion sensor 420 and a sixth assembly seat 421. The sixth torsion sensor 420 monitors the locking torque. The sixth tightening jig head 430 is connected to the sixth assembly seat 421 through the sixth up-down floating assembly (sixth fixed seat 441, sixth floating seat 442, and sixth spring 443). The sixth spring 443 can buffer the impact force when the jig head is pressed down. The sixth spring 443 is a cylindrical helical compression spring with a free length of 50 mm, a compression stroke of 15 mm, and an elastic coefficient of 3 N / mm. When the sixth tightening jig head 430 contacts the limit gasket, the sixth floating seat 442 compresses the spring to go up, buffers the impact force (maximum buffer force 500 N), and avoids damaging the surface of the gasket.

[0062] The sixth servo motor 410 drives the sixth tightening jig head 430 to rotate, and the limiting washer is screwed with the piston rod; the sixth torque sensor 420 stops after ensuring that the torque meets the standard, to avoid overtightening; the sixth spring 443 of the floating assembly can compensate for the axial position error of the limiting washer and the piston rod, to prevent the washer from being crushed.

[0063] As shown in Figure 12 and Figure 13 , the nut locking detection device 500 comprises a nut locking assembly and a nut detection assembly:

[0064] The nut locking assembly: the seventh servo motor 510 drives the seventh torque sensor 512 through the seventh speed reducer 511, and the output end of the seventh torque sensor 512 is connected with the seventh nut tightening head; the seventh up-and-down floating assembly (the seventh fixed seat 531, the seventh floating seat 532, and the seventh spring 533) is arranged between the seventh torque sensor 512 and the seventh nut tightening head, to buffer the downward impact;

[0065] The nut detection assembly: the eighth loosening detection servo motor 520 drives the eighth tightness detection head through the eighth speed reducer 521, and the eighth tightness detection head is composed of the eighth base 541 and the eighth detection clamp hand 542 (the eighth detection clamp hand 542 can clamp the nut and slightly rotate, and the loosening is judged by the change of the torque); the eighth detection clamp hand 542 is a pneumatic three-jaw chuck structure, and a groove matched with the hexagonal surface of the nut is processed on the inner side of the jaw part, and the opening and closing direction is along the radial direction; during detection, the eighth detection clamp hand 542 first clamps the nut (the clamping force is 300±50 N), and then the eighth loosening detection servo motor 520 drives the eighth detection clamp hand 542 to rotate clockwise by 3° (the torque threshold is 0.5-1 N·m), and if the rotation angle exceeds 1°, it is judged that the nut is loose, and an alarm is triggered.

[0066] After the locking assembly completes the nut fastening according to the set torque, the detection assembly dynamically detects the nut state through the eighth detection clamp hand 542, to ensure that there is no loosening; the seventh spring 533 of the floating assembly protects the surface of the nut, to avoid crushing; the double-component integrated design saves space and improves efficiency.

[0067] The overall working process of the technical solution is as follows:

[0068] Feeding: the worker places the piston rod of the pre-assembled lifting ring (bottom) and sealing assembly (middle) on the lifting ring fixing jig of the connecting seat locking device 100;

[0069] Holding: the second holding oil cylinder 272 of the piston rod holding device 200 drives the clamping arm to close, and the piston rod is held through the second holding sleeve a 232 and the second holding sleeve b 242;

[0070] Sealing assembly detection: The third detection head a330 of the sealing assembly detection device 300 synchronously detects whether the sealing assembly is in place, and the signal is fed back to the central control unit. After confirming that it is in place, the next step is entered;

[0071] Locking lifting ring: The first servo motor 151 of the connecting seat locking device 100 is started, and the first torsion sensor 121 is driven to rotate through gear transmission, thereby locking the lifting ring and the piston rod (the torque is monitored by the first torsion sensor 121);

[0072] Locking and limiting gasket: The lifting device 600 drives the lifting plate 003 to move downward, and the translation device 700 drives the translation frame 004 to move, so that the limiting gasket locking device 400 is aligned with the top of the piston rod. The lifting plate 003 moves downward again, the sixth tightening jig head 430 contacts the limiting gasket, and the sixth servo motor 410 is started to complete locking (the floating assembly buffers the impact) according to the set torque;

[0073] Locking and detecting nut: After the nut is preassembled to the top of the piston rod by manual operation, the translation device 700 drives the nut locking and detecting device 500 to be aligned with the work station. The lifting device 600 drives the locking assembly to move downward, and the seventh servo motor 510 is started to complete the locking of the nut (the torque is monitored by the seventh torsion sensor 512). Then, the eighth detection clamp hand 542 of the detecting assembly clamps and slightly rotates the nut to determine whether it is loose;

[0074] Blanking: After detection, the connecting seat locking device 100 is reversely rotated to reset, the piston rod clamping device 200 releases the clamping arm, the assembled piston rod is taken out by manual operation, and the equipment enters the next cycle.

[0075] The technical solution has the following advantages:

[0076] High precision: Each locking device is integrated with a torsion sensor, which can monitor and control the locking torque in real time, thereby avoiding over-tightening or loosening;

[0077] High reliability: Multi-link detection such as sealing assembly detection and nut loosening detection ensures assembly quality;

[0078] High adaptability: The clamping sleeve, lifting ring insertion column, detection seat and other components can be quickly replaced to adapt to different specifications of the piston rod;

[0079] High efficiency: The lifting and translation devices act cooperatively to shorten the work station switching time and reduce manual intervention in the automatic process;

[0080] Low damage: Each floating assembly is buffered by a spring to avoid damage caused by rigid collision.

[0081] In summary, the present application realizes high precision, high efficiency and high reliability of the piston rod assembly through the automatic design of multi-device cooperation, and effectively solves the problems of low efficiency, poor precision and easy damage in traditional manual assembly.

[0082] The above is only the embodiment of the present application, and does not limit the patent scope of the present application, and any equivalent structure or equivalent process transformation using the content of the present application specification, or direct or indirect application in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. An automatic assembly machine for piston rod assembly, characterized by: The machine frame (001) is provided with the connecting seat locking device (100), the piston rod holding device (200), the sealing assembly detection device (300), the limiting gasket locking device (400), the nut locking detection device (500), the lifting device (600), the translation device (700) and the central control unit; The connecting seat locking device (100) is arranged on the bottom of the machine frame (001), the lifting device (600) is arranged on the rear side wall of the inner cavity of the machine frame (001) and is connected with the lifting plate (003), the translation device (700) is arranged on the lifting plate (003) and is connected with the translation frame (004), the mounting frame (005) on the translation frame (004) is provided with the limiting gasket locking device (400) and the nut locking detection device (500), the mounting table is arranged on the rear side of the connecting seat locking device (100) on the machine frame (001), the piston rod holding device (200) and the mounting support are arranged on the mounting table, and the sealing assembly detection device (300) is arranged on the mounting support; the central control unit controls all actions of the devices.

2. An automatic assembly machine for piston rod assembly according to claim 1, characterized in that: The connecting seat locking device (100) comprises: a first base (110), the first base (110) is provided with a first partition a (111) and a first partition b (112), and the first base (110) is divided into a first lower layer, a first middle layer and a first upper layer arranged in sequence from bottom to top; the first partition a (111) is provided with a first bearing seat a (122) and a first bearing seat b (123), and the first partition b (112) is provided with a first bearing seat c (124) located directly above the first bearing seat a (122); a first transmission assembly, comprising a first torsion sensor (121), the upper part of the first torsion sensor (121) is assembled with the first bearing seat c (124) and the top end penetrates upward into the first upper layer, the lower part is assembled with the first bearing seat a (122) and the bottom end penetrates downward into the first lower layer, and the bottom end is provided with a first conversion gear a (125); a first power assembly, comprising a first speed reducer (152) assembled on the first bearing seat b (123) and located in the first middle layer, the output shaft of the first speed reducer (152) penetrates downward into the first lower layer, the input shaft is connected with a first servo motor (151), and the output shaft is provided with a first conversion gear b (126) located in the first lower layer; the first conversion gear a (125) and the first conversion gear b (126) are engaged with each other; a first up-down floating assembly, arranged at the top of the first torsion sensor (121) and located in the first upper layer, comprising a first fixed seat (131) and a first floating seat (132) arranged coaxially, the first fixed seat (131) is provided with a first spring groove (133), and a first spring (134) having one end fixed to the groove bottom and the other end fixedly connected to the top of the first floating seat (132) is arranged in the groove; a lifting ring fixing jig, arranged on the first floating seat (132), comprising a first support (141) and a first lifting ring insertion column (143), and the first support (141) is provided with at least one first mounting groove (142) for assembling the first lifting ring insertion column (143).

3. An automatic assembly machine for piston rod assembly as claimed in claim 1, wherein: The piston rod clamping device (200) comprises a second bottom plate (210) provided with a second hinge shaft a (211) on the front edge; a second clamping clamp comprising a second clamping arm a (221) and a second clamping arm b (222) assembled on the second hinge shaft a (211) and capable of opening and closing therearound; the inner side of the second clamping arm a (221) is provided with a second slot a (231) provided with a second clamping sleeve a (232); the inner side of the second clamping arm b (222) is provided with a second slot b (241) provided with a second clamping sleeve b (242); a second reset assembly is arranged on the second bottom plate (210) and located outside the second clamping arm a (221) and comprises a second reset block (251) and a second reset spring (252), one end of the second reset spring (252) is fixed with the second reset block (251) and the other end is fixed with the outer edge of the second clamping arm a (221); a second limiting assembly is arranged on the second bottom plate (210) and located at the rear side of the second reset assembly and comprises a second limiting cylinder a (261) and a second limiting block (262) at the output end thereof, the front edge of the second limiting block (262) abuts against the rear side of the second clamping arm a (221), and the contact corner thereof is in the form of a circular arc; a second clamping power assembly is arranged on the second bottom plate (210) and located at the rear side of the second limiting assembly and comprises a second oil cylinder fixing seat (271) and a second clamping oil cylinder (272) assembled thereon, the output end of the second clamping oil cylinder (272) is hingedly connected with the end of the second clamping arm b (222), and the arm body of the second clamping arm b (222) and the output end of the second clamping oil cylinder (272) form a connecting rod structure.

4. An automatic assembly machine for piston rod assembly as claimed in claim 1, wherein: The sealing assembly detection device (300) comprises at least two detection assemblies, and the detection assembly comprises a third assembly column a (310) and a third detector a assembled on the third assembly column a (310); the third detector a comprises a third detection head a (330) and a third detection seat a (320) for supporting the third detection head a (330), the third detection seat a (320) is sleeved on the third assembly column a (310) and can be adjusted in height and angle at will; the third detection seat a (320) is provided with a third assembly hole a (321) for sleeving the third assembly column a (310) and a third supporting plate a for supporting the third detection head a (330) on the front edge.

5. An automatic assembly machine for piston rod assembly as claimed in claim 1, wherein: The lifting device (600) comprises: a fourth support frame (610) provided with a fourth mounting plate (611) thereon; a fourth motor base (620) arranged on the top of the fourth mounting plate (611) and provided with a fourth lifting motor (621); a fourth bearing base a (630) arranged on the fourth mounting plate (611) and located directly below the fourth motor base (620) and provided with a fourth bearing a (631); a fourth bearing base b (640) arranged on the fourth mounting plate (611) and located directly below the fourth bearing base a (630) and provided with a fourth bearing b (641); a fourth lead screw (650) one end of which is assembled with the fourth bearing a (631) and the other end of which is assembled with the fourth bearing b (641), and the top of which is connected with the output end of the fourth lifting motor (621); a fourth lead screw sleeve (651) assembled on the fourth lead screw (650); and a fourth guide rail (660) arranged on the side of the fourth lead screw (650) and arranged in parallel, and provided with a fourth guide block (661) capable of sliding along the rail, wherein the back of the lifting plate (003) is fixedly connected with the fourth lead screw sleeve (651) and the fourth guide block (661).

6. An automatic assembly machine for piston rod assembly as claimed in claim 1, wherein: The translation device (700) comprises: a fifth translation rail (710) provided with a fifth sliding block (711) on the top of the fifth translation rail (710), and the translation frame (004) is mounted on the fifth sliding block (711); a fifth auxiliary rail (721) arranged on the lifting plate (003) and located above the fifth translation rail (710) and provided with a fifth push block (722) capable of sliding along the rail, and the front edge of the fifth push block (722) is fixedly connected with the upper edge of the translation frame (004); and the fifth translation push cylinder a (731) and the fifth translation push cylinder b (732) are arranged on the two sides of the fifth auxiliary rail (721) in opposition, and the output ends of the fifth translation push cylinder a (731) and the fifth translation push cylinder b (732) are all abutted against the fifth push block (722) to move the fifth push block (722). The limit switches (740) arranged on the two sides of the lifting plate (003) are used to limit the left-right translation of the translation frame (004).

7. An automatic assembly machine for piston rod assembly as claimed in claim 1, wherein: The limiting gasket locking device (400) comprises: a sixth power assembly comprising a sixth servo motor (410) and a sixth speed reducer (411) at the output end of the sixth servo motor (410); a sixth transmission assembly butted against the output end of the sixth speed reducer (411) and comprising a sixth torsion sensor (420) and a sixth assembly seat (421) on the sixth torsion sensor (420); a sixth tightening jig head (430) assembled on the sixth assembly seat (421); a sixth up-down floating assembly arranged between the sixth assembly seat (421) and the sixth tightening jig head (430) and comprising a sixth fixed seat (441) and a sixth floating seat (442) arranged coaxially, wherein the sixth fixed seat (441) is provided with a sixth spring groove, and the sixth spring groove is provided with a sixth spring (443) having one end fixed to the groove bottom and the other end fixedly connected with the top of the sixth floating seat (442).

8. An automatic assembly machine for piston rod assembly as claimed in claim 1, wherein: The nut locking detection device (500) comprises a nut locking assembly and a nut detection assembly; the nut locking assembly comprises a seventh servo motor (510), a seventh speed reducer (511) at the output end of the seventh servo motor (510), a seventh torsion sensor (512) at the output end of the seventh speed reducer (511), a seventh nut tightening head at the output end of the seventh torsion sensor (512), and a seventh up-and-down floating assembly arranged between the seventh torsion sensor (512) and the seventh nut tightening head; the seventh up-and-down floating assembly comprises a seventh fixed seat (531) and a seventh floating seat (532) arranged coaxially, the seventh fixed seat (531) is provided with a seventh spring groove, and a seventh spring (533) having one end fixed to the groove bottom and the other end fixedly connected to the top of the seventh floating seat (532) is arranged in the groove; The nut detection assembly comprises an eighth relaxation detection servo motor (520), an eighth speed reducer (521) at the output end of the eighth relaxation detection servo motor (520), and an eighth tightness detection head at the output end of the eighth speed reducer (521); the eighth tightness detection head comprises an eighth base (541) and an eighth detection clamp hand (542) assembled thereon.

Images