Sand blasting protection tool and shaft sleeve part local automatic sand blasting device and method

Abstract

The invention discloses a sand blasting protection tool and a shaft sleeve type part local automatic sand blasting device and method, and relates to the technical field of part surface sand blasting treatment. The sand blasting protection tool comprises a supporting frame, a driving mechanism, an inner circle clamping assembly and an outer circle clamping assembly. The inner circle clamping assembly drives a small shaft clack and a large shaft clack to move in the radial direction through a core pulling shaft so as to be attached to or separated from the inner circle face of the shaft sleeve. The outer circle clamping assembly drives the outer protective cover to move in the radial direction through the transmission disc so that the outer protective cover can be attached to or disengaged from the outer circle face of the shaft sleeve. According to the device, a PLC control system is adopted, automatic sand blasting treatment can be carried out on local parts of the shaft sleeve parts after sand blasting parameters are set, and the consistency of the sand blasting effect and the product quality are ensured. The inner circle clamping structure and the outer circle clamping structure exist independently, a gap between a workpiece and the device can be eliminated, and diffusion of a sand blasting area is prevented. In addition, the multi-petal type clamping structure enables the workpiece to be disassembled more conveniently, material spraying clamping stagnation and workpiece scratching are avoided, and the production efficiency and the product quality are remarkably improved.

Description

Technical Field

[0001] The invention relates to the technical field of part surface sandblasting treatment, and in particular to a sandblasting protective tooling, a local automatic sandblasting device and a method for shaft sleeve parts. Background Art

[0002] Sandblasting is a process of cleaning and roughening the surface of a substrate by the impact of high-speed sand flow. Compressed air is used as the power to form a high-speed jet beam to spray the material (copper ore sand, quartz sand, corundum, iron sand, Hainan sand) at high speed onto the surface of the workpiece to be processed, so that the appearance or shape of the workpiece changes. Due to the impact and cutting action of the abrasive on the workpiece surface, the surface of the workpiece obtains a certain degree of cleanliness and different degrees of roughness, and the mechanical properties of the workpiece surface are improved, thereby improving the fatigue resistance of the workpiece, increasing the adhesion between it and the coating, extending the durability of the coating, and also facilitating the leveling and decoration of the coating.

[0003] Nowadays, when manual sandblasting is performed on shaft sleeve parts, it involves positioning the parts and shielding and protecting the non-sandblasting surface. The existing local sandblasting technology for shaft sleeve parts has the following shortcomings: due to the processing and manufacturing errors of the product and tooling, as well as the wear of the tooling equipment under the long-term impact of the spraying material, a certain gap appears between the workpiece and the sandblasting tooling; the appearance of this gap causes the clamping of the workpiece by the sandblasting device to loosen, and even the extreme phenomenon of the workpiece being blown away during the sandblasting process; when the spraying material falls into the above gap, the non-sandblasting area of ​​the workpiece will also be slightly sandblasted, causing the diffusion of the sandblasting area, and ultimately causing a large deviation between the actual size of the workpiece sandblasting and the designed size; when the spraying material falls into the above gap, it will also make the workpiece very difficult to disassemble and assemble, reducing the processing and production efficiency of the parts; when the spraying material falls into the above gap, it will also cause the workpiece to be stuck and unable to be removed, and forced removal will scratch the surface of the workpiece, reducing product quality. Summary of the invention

[0004] The invention provides a sandblasting protective tool, a local automatic sandblasting device and a method for shaft sleeve parts, so as to improve the local sandblasting efficiency of shaft sleeve parts and prevent the surface of the workpiece from being scratched.

[0005] In order to solve the above problems, the technical solution adopted by the present invention is as follows:

[0006] In the first aspect, the present invention provides a sandblasting protective tooling, comprising a support frame, a driving mechanism for driving the support frame to rotate, an inner circle clamping assembly installed on the support frame and used to protect the inner circle surface of the clamping sleeve, and an outer circle clamping assembly installed on the support frame and used to protect the outer circle surface of the clamping sleeve; the inner circle clamping assembly comprises a core pulling shaft, and a small shaft flap and a large shaft flap arranged around the core pulling shaft, and the small shaft flap and the large shaft flap can be driven by the core pulling shaft to move radially, so that the arc surface working parts of the small shaft flap and the large shaft flap are separated from or fitted to the inner circle surface of the sleeve; the outer circle clamping assembly comprises an outer protective cover and a transmission disk, and the outer protective cover comprises an outer circle protective flap, and the outer protective cover can be driven by the transmission disk to move radially, so that the inner arc surface of the outer circle protective flap is separated from or fitted to the outer circle surface of the sleeve.

[0007] As a further description of the above technical solution, there are three outer protective covers, which are evenly arranged around the core-pulling shaft; the support frame is installed with a limit plate having a first linear slide groove, and the outer protective cover also includes a slider connected to the outer circular protective petal and slidably matched with the first linear slide groove, the transmission plate is provided with an arc-shaped slot hole, and the slider is provided with a cylindrical boss that is clamped in the arc-shaped slot hole, and through the rotation of the transmission plate, the slider and the outer circular protective petal can be driven to slide along the first linear slide groove under the cooperation of the arc-shaped slot hole and the cylindrical boss; when the outer circular protective petals of the three outer protective covers are combined, a full circular structure is formed in which the inner circle matches the outer circular surface of the sleeve.

[0008] As a further description of the above technical solution, the limit plate is provided with a lug for mounting the first motor, the motor shaft of the first motor is mounted with a pinion I, and the transmission plate is a gear meshing with the pinion I.

[0009] As a further description of the above technical solution, there are three small shaft petals and three large shaft petals, and they are arranged at intervals around the core-pulling shaft; the core-pulling shaft is a hexagonal prism structure with three first inclined surfaces and three second inclined surfaces, and each of its inclined surfaces is provided with a second linear slide groove; the small shaft petal has a first arc surface working portion, a first plane working portion and a first convex-shaped sliding block portion arranged on the first plane working portion; the large shaft petal has a second arc surface working portion, a second plane working portion and a second convex-shaped sliding block portion arranged on the second plane working portion; the three first inclined surfaces of the core-pulling shaft correspond to each other and fit the second plane working portions of the three large shaft petals, and the second linear slide grooves located on the three first inclined surfaces correspond to each other and slide with the three second convex-shaped sliding blocks; the three second inclined surfaces of the core-pulling shaft correspond to each other and fit the first plane working portions of the three small shaft petals, and the second linear slide grooves located on the three second inclined surfaces correspond to each other and slide with the three first convex-shaped sliding blocks; when the three small shaft petals and the three large shaft petals are combined together, a full-circle structure is formed in which the outer circle matches and fits the inner circle surface of the sleeve.

[0010] As a further description of the above technical solution, the support frame is installed with a limit block having a limit groove, the limit groove is slidably matched with the pull rod connected to the core pulling shaft, the pull rod is fixedly connected to the rack, the limit block is installed with a second motor, and the motor shaft of the second motor is installed with a pinion II that engages with the rack.

[0011] As a further description of the above technical solution, the driving mechanism includes a base, a through-hole conductive slip ring installed on the base, a bottom support rod installed on the base and built into the through-hole conductive slip ring, a third motor installed on the base through a motor fixing block, a pinion III installed on the motor shaft of the third motor, a self-rotating gear fixed to the support frame and meshing with the pinion III, and a radial thrust bearing that rotationally connects the support frame and the bottom support rod.

[0012] As a further description of the above technical solution, the support frame and the driving mechanism are both built into the casing, and the base is detachably connected to the casing by screws.

[0013] In a second aspect, the present invention provides a local automatic sandblasting device for sleeve-type parts, comprising a protective cabin with a transparent door, a PLC controller, a control panel, a rotating shaft installed on the protective cabin, a spray gun installed on the rotating shaft, and the sandblasting protective tooling described in the first aspect installed in the protective cabin.

[0014] In a third aspect, the present invention provides a method for local automatic sandblasting of sleeve-type parts, which adopts the local automatic sandblasting device for sleeve-type parts described in the second aspect, including: setting the required sandblasting parameters on the control panel, including the outer circle clamping torque, the inner circle clamping torque, the swing frequency of the spray gun, the swing amplitude of the spray gun, the self-rotation speed of the workpiece and the sandblasting time; converting the sandblasting parameters into control parameters of each motor by the PLC controller.

[0015] As a further description of the above technical solution, each of the motors is a servo motor and is equipped with a torque sensor to feed back the output torque to the PLC controller in real time.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1) Through the innovative clamping method design, the clamping degree of the workpiece is controlled by torque, which is divided into outer circle clamping torque and inner circle clamping torque. The two clamping torques exist independently and can be set separately without interfering with each other. The two clamping torques are fed back by their respective servo motor sensors, controlled by PLC, and displayed in real time by the control panel. This clamping method can also be understood as elastic clamping, which can compensate for the machining error of parts and effectively eliminate the gap between the workpiece and the device, ultimately ensuring that the workpiece will not shake or fall off during the sandblasting process.

[0018] 2) The present invention eliminates the gap between the workpiece and the sandblasting device, prevents the blasting material from falling into the gap, prevents the diffusion of the sandblasting area, ensures the consistency between the actual size of the workpiece sandblasted and the designed size, greatly improves the sandblasting accuracy, and effectively improves the appearance quality of the workpiece.

[0019] 3) The outer circle of the workpiece adopts a 3-petal clamping structure, and the inner circle of the workpiece adopts a 6-petal clamping structure. When the workpiece is disassembled, the gap between the workpiece and the device can be increased with multiple degrees of freedom, avoiding the jamming of the device and the workpiece by the spray material, making it extremely easy to disassemble the workpiece after sandblasting, saving the disassembly time of the sandblasted workpiece and improving production efficiency.

[0020] 4) During the disassembly process of the workpiece after sandblasting, the gap between the workpiece and the device can be increased in multiple degrees of freedom and directions, eliminating the extrusion force between the spray material and the workpiece, thereby solving the possibility of the surface of the workpiece being scratched during disassembly and improving product quality.

[0021] 5) The existing sandblasting technology usually uses workers to manually control the sandblasting parameters (including distance, swing angle, swing speed) of shaft sleeve parts. Human factors have a great influence on the consistency of product quality, and the consistency of product quality cannot be effectively controlled. The sandblasting device in the present invention is equipped with a PLC control system, which can realize automatic control and adjustment of sandblasting parameters (including sandblasting distance, spray gun swing angle, spray gun swing speed, workpiece rotation speed), ensure the sandblasting effect, and solve the problem of poor product quality consistency.

[0022] 6) The clamping of the existing sandblasting device is all done manually, which takes a lot of time and is inefficient. It also requires a high level of worker proficiency, and defective products will appear if you are not careful. The present invention uses a PLC control system to drive a servo motor to automatically clamp the workpiece, which saves the clamping time of the workpiece during sandblasting, saves man-hours, and improves production efficiency.

[0023] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the embodiments of the present invention are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 An overall schematic diagram of a local automatic sandblasting device for sleeve-type parts according to an embodiment of the present invention;

[0026] Figure 2 is a schematic structural diagram of the sandblasting protective tooling described in the embodiment;

[0027] Figure 3 is a schematic cross-sectional view of the sandblasting protective tooling described in the embodiment;

[0028] Figure 4 is a schematic diagram of the structure from a first perspective after the sandblasting protective tooling described in the embodiment is hidden in the housing;

[0029] Figure 5 is a schematic diagram of the structure from a second viewing angle after the sandblasting protective tooling described in the embodiment is hidden in the housing;

[0030] Figure 6 is a schematic structural diagram of the outer protective cover described in the embodiment;

[0031] Figure 7 is a schematic structural diagram of the transmission disc described in the embodiment;

[0032] Figure 8 is a schematic diagram of the structure of the limiting plate described in the embodiment;

[0033] Fig. 9 is a schematic structural diagram of the limit block described in the embodiment;

[0034] Fig.10 1 is a schematic structural diagram of the first assembly perspective of the small shaft flap, the large shaft flap and the core-pulling shaft described in the embodiment;

[0035] Fig.11 is a schematic structural diagram of the second assembly perspective of the small shaft flap, the large shaft flap and the core-pulling shaft described in the embodiment;

[0036] Fig.12 is a schematic structural diagram of the small shaft flap described in the embodiment;

[0037] Fig.13 is a schematic structural diagram of the large shaft flap described in the embodiment;

[0038] Fig.14 2 is a schematic structural diagram of the core-pulling shaft described in the embodiment;

[0039] Fig.15 Schematic diagram of the workpiece before and after the outer circle of the workpiece is clamped in the embodiment, wherein the left figure shows the state where the workpiece is not clamped by the outer protective cover before clamping, and the right figure shows the state where the workpiece is clamped by the outer protective cover after clamping;

[0040] Fig.16 Schematic diagram of the inner circle of the workpiece before and after clamping in the embodiment, wherein the left figure shows the state where the inner circle of the workpiece is not clamped by protection before clamping, and the right figure shows the state where the inner circle of the workpiece is clamped by protection after clamping;

[0041] Fig.17 A schematic diagram of the PLC control flow of the local automatic sandblasting device described in the embodiment;

[0042] In the figure: 1-sandblasting protective tooling, 101-outer protective cover, 1011-outer circular protective flap, 1012-slider, 1013-cylindrical boss, 102-transmission plate, 1021-arc slot, 103-pinion I, 104-limiting plate, 1041-first linear slide, 1042-lug, 105-support frame, 106-first motor, 107-limiting block, 1071-limiting groove, 108-second motor, 109-third motor, 110-through-hole conductive slip ring, 111-rack, 112-pull rod, 113-pinion II, 114-pinion III, 115-motor fixing block, 116- Base, 117-small shaft flap, 1171-first arc surface working part, 1172-first plane working part, 1173-first convex sliding block part, 118-large shaft flap, 1181-second arc surface working part, 1182-second plane working part, 1183-second convex sliding block part, 119-pulling shaft, 1191-second linear slide groove, 1192-first inclined plane, 1193-second inclined plane, 120-casing, 121-self-rotating gear, 122-radial thrust bearing, 123-bottom support rod, 2-spray gun, 3-rotating axis, 4-sandblasting device protection cabin, 5-spraying material, 6-workpiece, 7-control panel. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0044] like Figure 1 As shown, an embodiment of the present invention provides a local automatic sandblasting device for sleeve-type parts, including a sandblasting protective tooling 1, a spray gun 2, a rotating shaft 3 and a protective cabin 4, and a PLC controller is arranged inside the device. The PLC controller is matched with a control panel 7, and the sandblasting parameters can be set, controlled and displayed in real time through the control panel 7.

[0045] The sandblasting protective tooling 1 is installed in the protective cabin 4, and its main function is to automatically clamp the workpiece 6 to be sandblasted and to protect the parts of the workpiece 6 that do not need sandblasting. The spray gun 2 is fixed to the rotating shaft 3 by threading or welding, and it uses compressed air to spray the spray material 5. The distance between the spray gun 2 and the workpiece 6 can be adjusted. At the same time, the spray gun 2 can swing under the rotation of the rotating shaft 3, in order to make the sandblasting area uniform. The rotating shaft 3 is installed on the protective cabin 4 through bearings and bearing seats. It can rotate forward and reverse under the drive of the motor belt drive mechanism (chain, gear and other transmission methods can also be used). The rotation speed and angle are adjustable. The rotation speed is ultimately reflected as the swing frequency of the spray gun 2, and the rotation angle is ultimately reflected as the swing amplitude of the spray gun 2. The protective cabin 4 is the support part of the device, which is made of sheet metal welding and is provided with load-bearing reinforcing ribs and brackets. It is also provided with a transparent cabin door, which can be opened and closed. The cabin door is made of transparent materials such as acrylic or plexiglass, which is convenient for operators to pick up, install, sandblast and observe the workpiece.

[0046] The spray material 5 is sprayed out by the spray gun 2 through compressed air in a fan shape. Its main function is to hit the surface of the workpiece 6 at a certain flow rate to form tiny pits on the surface of the workpiece 6, change the surface morphology of the workpiece 6 or achieve a certain decorative effect; the spray material 5 swings with the swing of the spray gun 2, so that each blasting area of ​​the workpiece achieves a uniform blasting effect.

[0047] Workpiece 6 is a product, which is a shaft sleeve structure, generally a cylinder with a through hole inside, that is, a cylinder, which is the object of sandblasting by the device of the present invention; the workpiece 6 needs to be partially sandblasted, and the unblasted area needs to be shielded and protected based on the sandblasting protective tooling 1, see Figure 1 , Figure 2 and Figure 3 shown.

[0048] The control panel 7 is a touch screen panel, which is fixed on the protective cabin 4 by screws and is connected to the PLC control system. It can display the data of the PLC system (including parameters such as rotation speed, outer circle clamping torque, inner circle clamping torque, sandblasting time, etc.) in real time; the control parameters of the PLC system (including outer circle clamping torque, inner circle clamping torque, swing frequency of the spray gun 2, swing amplitude of the spray gun 2, self-rotation speed of the workpiece 6, sandblasting time, etc.) can also be set and adjusted separately through the control panel 7; at the same time, single-line operation can be performed through the control panel 7, such as controlling the forward or backward movement of the outer protective cover 101 to achieve the clamping and loosening of the outer circle of the workpiece 6; the inner circle of the workpiece 6 can also be clamped and loosened by controlling the rise or fall of the core pulling shaft 119; the rotation or stop of the workpiece 6 can also be controlled; the swing or stop of the spray gun 2 can also be controlled.

[0049] Combine the following Figures 2 to 14The sandblasting protective tooling 1 of this device is introduced in detail:

[0050] The main function of the outer protective cover 101 is to protect and clamp the outer non-sandblasting surface of the workpiece 6. It is a 1 / 3 structure. Figure 6 The outer protective cover 101 includes an outer circular protective flap 1011 and a slider 1012. The outer circular protective flap 1011 is a 1 / 3 shaft sleeve structure. The slider 1012 is slidably matched in the first linear slide groove 1041 of the limit plate 104. A small cylindrical boss 1013 is arranged on the slider 1012, which is embedded in the arc-shaped slot 1021 on the transmission plate 102 and can slide along the arc-shaped slot 1021 as the transmission plate 102 rotates, that is, the arc-shaped slot 1021 The cylindrical boss 1013 can be moved to make the slider 1012 slide back and forth along the first linear groove 1041. The outer circle protection flap 1011 is welded to the slider 1012. Then the outer circle protection flap 1011 can move back and forth along the direction of the first linear groove 1041, so that the three-petal outer circle protection flap 1011 can open to release the outer circle surface of the workpiece 6, or close to clamp the outer circle surface of the workpiece 6. That is, the workpiece 6 can be clamped and released as a whole.

[0051] The transmission disk 102 is a gear-shaped part, meshing with the pinion I 103, and the pinion I 103 cooperates with the first motor 106 through a key and a retaining spring to drive the transmission disk 102 to rotate; secondly, the transmission disk 102 has three kidney-shaped slots, namely arc slots 1021, which are evenly distributed along the circumference and can drive the outer protective cover 101 to slide;

[0052] The limiting plate 104 is fixed to the top of the support frame 105 by screws. The lug 1042 on the limiting plate 104 is installed with the first motor 106. The first linear slide groove 1041 on the limiting plate 104 is used to limit the radial displacement of the outer protective cover 101. Figure 8 shown.

[0053] The limit block 107 is fixed to the support frame 105 by screws, and the second motor 108 is installed on the limit block 107 by screws. Secondly, the limit block 107 has a limit groove 1071, which is used to guide the rack 111 to move up and down, limit the circumferential position of the rack 111, and prevent it from falling out during the up and down movement. Fig. 9 shown.

[0054] like Figure 3 , Figure 4 and Figure 5 As shown, the support frame 105 is a cage-like structure, which mainly plays a role of structural support and provides sufficient space for the installation of components therein.

[0055] The bottom end of the support frame 105 is connected to the rotating gear 121 by screws; a through hole is provided at the bottom end of the support frame 105, which is clearance-matched with the bottom support rod 123, that is, the support frame 105 rotates to match and is supported on the bottom support rod 123; the bottom support rod 123 is provided with a shoulder, and a radial thrust bearing 122 is installed on the shoulder. The bottom end of the support frame 105 is supported on the shoulder of the bottom support rod 123 through the radial thrust bearing 122, so that the support frame 105 rotates to match the bottom support rod 123.

[0056] The bottom support rod 123 is inserted into the 360-degree rotating through-hole conductive slip ring 110. The through-hole conductive slip ring 110 is provided with a conductive ring and a brush to realize the power supply requirement of the rotating structure body; two sets of stator and rotor connection ports are provided thereon, the stator connection port is fixed to the non-rotating base 116, and the rotor connection port is fixed to the bottom end of the support frame 105, so as to realize the power supply of the first motor 106 and the second motor 108.

[0057] The top of the pull rod 112 is provided with a cylindrical thread, through which it is connected to the core-pulling shaft 119, and its main function is to drive the core-pulling shaft 119 to rise or fall; in addition, the pull rod 112 has a flat surface, which is fixed to the rack 111 by screws; the rack 111 is meshed with the pinion II 113; the pinion II 113 is assembled to the second motor 108 through a flat key and a retaining spring, and rotates when driven by the second motor 108, thereby driving the rack 111 to move up and down.

[0058] The pinion III 114 is assembled on the third motor 109 through a flat key and a retaining spring, and rotates when driven by the third motor 109, thereby driving the rotation gear 121 to rotate. The third motor 109 is connected to the motor fixing block 115 through screws. The motor fixing block 115 adopts a sheet metal structure and is fixed to the base 116 by screws. Its main function is to fix and support the third motor 109 by screws.

[0059] The first motor 106 , the second motor 108 and the third motor 109 are all servo motors with torque sensors, which can provide real-time feedback and control on the output torque.

[0060] The base 116 is a disc structure with a groove in the middle, and the groove accommodates and welds the bottom support rod 123. Figure 3 As shown; the base 116 is provided with an internal threaded hole near the outer circle, which is fixed with the housing 120 by screws. The main function of the housing 120 is to protect the device inside it.

[0061] The small shaft flap 117 is provided with a first arc surface working portion 1171, a first plane working portion 1172 and a first convex-shaped slider portion 1173 arranged on the first plane working portion 1172. The first arc surface working portion 1171 is used to fit the inner circular surface of the protective workpiece 6, the first plane working portion 1172 is used to fit the outer surface of the core-pulling shaft 119, and the first convex-shaped slider portion 1173 is slidably matched with the second linear slide groove on the core-pulling shaft 119; in this embodiment, the angle between the first plane working portion 1172 and the top plane of the small shaft flap 117 is 81.5°, see Fig.10 , Fig.11 and Fig.12 shown.

[0062] The large shaft flap 118 is provided with a second arc surface working portion 1181, a second plane working portion 1182 and a second convex-shaped slider portion 1183 arranged on the second plane working portion 1182. The second arc surface working portion 1181 can be used to fit the inner circular surface of the protective workpiece 6, the second plane working portion 1182 is used to fit the outer surface of the core-pulling shaft 119, and the second convex-shaped slider portion 1183 is slidably matched with the second linear slide groove on the core-pulling shaft 119; in this embodiment, the angle between the second plane working portion 1182 and the bottom end plane of the large shaft flap 118 is 94°, see Fig.10 , Fig.11 and Fig.13 shown.

[0063] The bottom of the core-pulling shaft 119 is provided with a threaded hole, which is connected to the pull rod 112 and moves up and down driven by the pull rod 112. Secondly, the surface of the core-pulling shaft 119 is provided with 6 second linear slide grooves 1191, which are respectively slidably matched with the first convex-shaped slider portion 1173 on the small shaft petal 117 and the second convex-shaped slider portion 1183 on the large shaft petal 118. Finally, the core-pulling shaft 119 has three first inclined surfaces 1192 and three second inclined surfaces 1193, and the first inclined surfaces 1192 and the second inclined surfaces 1193 are arranged circumferentially and at intervals around the core-pulling shaft 119; the first inclined surface 1192 has an inclination angle of 4° (i.e., an angle of 86° with the bottom plane of the core-pulling shaft 119), which fits with the second planar working portion 1182 of the large shaft petal 118; the second inclined surface 1193 has an inclination angle of 8.5° (i.e., an angle of 81.5° with the bottom plane of the core-pulling shaft 119), which fits with the first planar working portion 1172 of the small shaft petal 117, see Fig.10 , Fig.11 and Fig.14 shown.

[0064] like Fig.17 As shown, the specific working process of the local automatic sandblasting device in this embodiment includes:

[0065] (1) Start the equipment and input the required sandblasting parameters on the control panel 7, including the outer circle clamping torque, the inner circle clamping torque, the swing frequency of the spray gun 2, the swing amplitude of the spray gun 2, the self-rotation speed of the workpiece 6 and the sandblasting time; the value of the clamping torque here needs to be determined through the early debugging of the product. During the product debugging, a variety of clamping torques can be tried, and the optimal clamping torque is finally determined according to the clamping effect; the optimal clamping torque selection principle is: 1. The workpiece 6 cannot be clamped and visible scratches cannot be left on the surface of the workpiece 6; 2. During the entire process of the self-rotation of the sandblasting device, the workpiece 6 will not shake or fall off;

[0066] (2) Click the "Start" button on the control panel 7, and the sandblasting device moves according to the set program:

[0067] The first motor 106 rotates according to the set clamping torque, driving the pinion I 103 to rotate forward, and then driving the transmission disk 102 to rotate. The arc-shaped slot on the transmission disk 102 drives the outer protective cover 101 to approach the outer cylindrical surface of the workpiece 6, thereby clamping and protecting the outer cylindrical surface of the workpiece 6; during the entire clamping process, the first motor 106 always provides the device with the set clamping torque to maintain continuous clamping of the outer circle of the workpiece 6; at the same time, during the clamping process of the workpiece 6, the PLC system will monitor the torque fed back by the motor sensor of the first motor 106 in real time. Once the real-time torque does not match the set torque, the PLC system will issue an emergency shutdown command to prevent the workpiece 6 from being clamped or thrown away due to insufficient clamping torque. The state before / after the outer circle of the workpiece 6 is clamped can be seen. Fig.15 As shown;

[0068] The second motor 108 drives the pinion II 113 to rotate forward, thereby driving the rack 111 to move upward, and the core-pulling shaft 119 moves upward accordingly, so that the small shaft flap 117 and the large shaft flap 118 expand outward, completing the clamping and protection of the inner circle of the workpiece 6; the cooperation between the core-pulling shaft 119 and the shaft flap uses 8.5° and 4° cooperation here, which can achieve the effect of synchronous outward expansion or inward contraction of the small shaft flap 117 and the large shaft flap 118, and there will be no interference or jamming between them; during the entire clamping process, the second motor 108 always provides the device with the set clamping torque to maintain continuous clamping of the inner circle of the workpiece 6; the state before / after the inner circle of the workpiece 6 is clamped can be seen Fig.16 As shown;

[0069] The third motor 109 drives the pinion III 114 to rotate, and then drives the self-rotating gear 121 to rotate, and finally realizes the workpiece 6 to rotate at the speed set by the control panel 7. The purpose of rotating the workpiece 6 here is to ensure that the workpiece 6 is evenly sandblasted to prevent leakage;

[0070] The spray gun 2 starts to move according to the swing frequency and swing amplitude set by the control panel 7, and sprays the spray material 5 according to the sandblasting time set by the control panel 7 driven by the compressed air;

[0071] The spray material 5 hits the unprotected sandblasting part of the workpiece 6, achieving the sandblasting effect on the surface of the specific area of ​​the outer circle and inner circle of the workpiece 6;

[0072] When the sandblasting time is reached, the spray gun 3 stops swinging and sandblasting, and the workpiece 6 stops rotating;

[0073] The second motor 108 drives the pinion II 113 to reverse, and then drives the rack 111 to move downward, and the core-pulling shaft 119 moves downward accordingly, so that the small shaft petal 117 and the large shaft petal 118 shrink inward, releasing the clamping and protection of the inner circle of the workpiece 6. The state of the inner circle of the workpiece 6 before and after being clamped is shown in FIG. Fig.13 As shown;

[0074] The first motor 106 drives the pinion 1103 to rotate in the reverse direction, thereby driving the rotating disk 102 to rotate. The groove on the rotating disk 102 drives the outer protective cover 101 to move away from the outer circle of the workpiece 6, thereby releasing the clamping and protection of the outer circle of the workpiece 6. The state of the outer circle of the workpiece 6 before and after being clamped is shown in FIG. Fig.12 As shown;

[0075] (3) Open the door of the protective cabin 4 and take out the workpiece 6. At this point, the sandblasting process is completed.

[0076] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A sandblasting protective tooling, characterized in that: The invention comprises a support frame (105), a driving mechanism for driving the support frame (105) to rotate, an inner circle clamping assembly installed on the support frame (105) and used for protecting and clamping the inner circle surface of the shaft sleeve, and an outer circle clamping assembly installed on the support frame (105) and used for protecting and clamping the outer circle surface of the shaft sleeve; the inner circle clamping assembly comprises a core-pulling shaft (119), and a small shaft petal (117) and a large shaft petal (118) arranged around the core-pulling shaft (119), and the small shaft petal (117) and the large shaft petal (118) can be driven by the core-pulling shaft (119). The shaft flap (117) and the large shaft flap (118) move radially, so that the arc surface working parts of the small shaft flap (117) and the large shaft flap (118) are separated from or fit into the inner circular surface of the shaft sleeve; the outer circular clamping assembly comprises an outer protective cover (101) and a transmission disk (102), and the outer protective cover (101) comprises an outer circular protective flap (1011). The transmission disk (102) can drive the outer protective cover (101) to move radially, so that the inner arc surface of the outer circular protective flap (1011) is separated from or fit into the outer circular surface of the shaft sleeve.

2. The sandblasting protective tooling according to claim 1, characterized in that: The outer protective cover (101) has three parts and is evenly arranged in the circumferential direction around the core-pulling shaft (119); the support frame (105) is installed with a limit plate (104) having a first linear slide groove (1041); the outer protective cover (101) also includes a slider (1012) connected to the outer circular protective flap (1011) and slidably matched with the first linear slide groove (1041); the transmission plate (102) is provided with an arc-shaped slot hole (1021); the slider (1012) is provided with a The cylindrical boss (1013) disposed in the arc-shaped slot (1021) can, through the rotation of the transmission plate (102), drive the slider (1012) and the outer circular protective flap (1011) to slide along the first linear slide groove (1041) in cooperation with the arc-shaped slot (1021) and the cylindrical boss (1013); when the outer circular protective flaps (1011) of the three outer protective covers (101) are put together, a full circular structure is formed in which the inner circle matches and fits the outer circular surface of the sleeve.

3. The sandblasting protective tooling according to claim 2, characterized in that: The limit plate (104) is provided with a lug (1042) for mounting the first motor (106); the motor shaft of the first motor (106) is mounted with a pinion gear I (103); and the transmission plate (102) is a gear meshing with the pinion gear I (103).

4. The sandblasting protective tooling according to claim 1, characterized in that: The small shaft flap (117) and the large shaft flap (118) are both three in number and are arranged at intervals around the core-pulling shaft (119); the core-pulling shaft (119) is a hexagonal prism structure having three first inclined surfaces (1192) and three second inclined surfaces (1193), and each inclined surface is provided with a second linear slide groove (1191); the small shaft flap (117) has a first arc surface working portion (1171), a first plane working portion (1172) and a first convex-shaped sliding block portion (1173) provided on the first plane working portion (1172); the large shaft flap (118) has a second arc surface working portion (1181), a second plane working portion (1182) and a second convex-shaped sliding block portion (1183) provided on the second plane working portion (1182); the core-pulling shaft (119) is a hexagonal prism structure having three first inclined surfaces (1192) and three second inclined surfaces (1193), and each inclined surface is provided with a second linear slide groove (1191); The three first inclined surfaces (1192) of the shaft (19) correspond to each other with the second planar working parts (1182) of the three large shaft flaps (118), and the second linear slide grooves (1191) located on the three first inclined surfaces (1192) correspond to each other in sliding cooperation with the three second convex-shaped sliding blocks (1183); the three second inclined surfaces (1193) of the core-pulling shaft (119) correspond to each other with the first planar working parts (1172) of the three small shaft flaps (117), and the second linear slide grooves (1191) located on the three second inclined surfaces (1193) correspond to each other in sliding cooperation with the three first convex-shaped sliding blocks (1173); when the three small shaft flaps (117) and the three large shaft flaps (118) are combined together, a full-circle structure is formed in which the outer circle matches and fits the inner circle of the sleeve.

5. The sandblasting protective tooling according to claim 4, characterized in that: The support frame (105) is installed with a limit block (107) having a limit groove (1071), the limit groove (1071) is slidably matched with the pull rod (112) connected to the core-pulling shaft (119), the pull rod (112) is fixedly connected to the rack (111), the limit block (107) is installed with a second motor (108), and the motor shaft of the second motor (108) is installed with a pinion II (113) meshing with the rack (111).

6. The sandblasting protective tooling according to claim 1, characterized in that: The driving mechanism comprises a base (116), a through-hole conductive slip ring (110) mounted on the base (116), a bottom support rod (123) mounted on the base (116) and built into the through-hole conductive slip ring (110), a third motor (109) mounted on the base (116) via a motor fixing block (115), a pinion III (114) mounted on the motor shaft of the third motor (109), a self-rotating gear (121) fixed to the support frame (105) and meshing with the pinion III (114), and a radial thrust bearing (122) rotatably connected to the support frame (105) and the bottom support rod (123).

7. The sandblasting protective tooling according to claim 1, characterized in that: The support frame (105) and the driving mechanism are both built into the casing (120), and the base (116) is detachably connected to the casing (120) via screws.

8. A local automatic sandblasting device for sleeve parts, characterized in that: It comprises a protective cabin with a transparent cabin door, a PLC controller, a control panel (7), a rotating shaft (3) installed on the protective cabin, a spray gun (2) installed on the rotating shaft (3), and a sandblasting protective tooling according to any one of claims 1 to 7 installed in the protective cabin.

9. A method for local automatic sandblasting of sleeve parts, characterized in that: The local automatic sandblasting device for sleeve parts as claimed in claim 8 comprises: setting the required sandblasting parameters on the control panel (7), including the outer circle clamping torque, the inner circle clamping torque, the swing frequency of the spray gun (2), the swing amplitude of the spray gun (2), the self-rotation speed of the workpiece (6) and the sandblasting time; and converting the sandblasting parameters into control parameters of each motor by the PLC controller.

10. The method according to claim 9, characterized in that Each of the motors is a servo motor and is equipped with a torque sensor to feed back the output torque to the PLC controller in real time.

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