Locking mechanism and powder cleaning device

Abstract

The invention provides a locking mechanism. The locking mechanism comprises a locking body, a swing rod device, a locking bolt and a locking device. The swing rod device is rotatably mounted on the locking body, and a first rotating axis is formed between the swing rod device and the locking body; the locking bolt is provided with a pressing surface and is rotatably mounted on the swing rod device, a second rotating axis is arranged between the locking bolt and the swing rod device, and the second rotating axis is parallel to the first rotating axis; the locking device is provided with a cam, the cam is rotatably arranged on the locking body, and the locking bolt is located on the rotating track of the protruding part of the cam. The invention further provides a powder cleaning device which comprises the locking mechanism. The cam is driven to rotate around the axis of the cam so that the locking bolt can be driven to act, the locking bolt is connected with the locking body through the swing rod device, the cam can drive the locking bolt to swing relative to the locking body, self-locking of the locking state can be achieved through swing, stability of the locking state is guaranteed, and due to self-locking of the cam, the stability of the locking state is guaranteed. And a relatively large redundancy design can be realized.

Description

TECHNICAL FIELD

[0001] The present application relates to additive manufacturing equipment, in particular to a locking mechanism and a powder cleaning device. BACKGROUND

[0002] Large-scale powder bed metal additive manufacturing equipment is generally provided with a separate powder cleaning station. After the forming cylinder is printed, the workpiece needs to be transferred to the powder cleaning device for powder cleaning. After the powder cleaning is completed, the forming substrate is manually released, and the substrate and the workpiece are lifted out together by a crane to complete the workpiece taking. In the powder cleaning and taking process, the existing technology generally adopts the following methods: 1. The powder cleaning is completed by a separate powder cleaning station and a powder cleaning device, and the taking is completed at a separate taking position. This method is convenient to operate and maintain, but because there is a separate powder cleaning and taking position, the size of the equipment is increased, the production cost of the equipment manufacturer is further increased, the area utilization rate of the factory building is reduced when the terminal purchase customer uses in batches, and the unit area productivity is further reduced. Therefore, this method is also not an economical and saving method; 2. The powder cleaning and taking are completed in the same station and the same device. After the powder cleaning is completed, the workpiece and the substrate are lifted out from the top of the powder cleaning cavity. This method has a compact structure, a relatively low equipment area, and a high corresponding factory building area utilization rate. However, because the workpiece is lifted from the top, the workpiece needs to be lifted to a height higher than the powder cleaning cavity before the horizontal movement is performed. Higher requirements are put forward for the layout of the factory building and the lifting height of the crane. Because the powder cleaning cavity is a closed structure, it is very inconvenient for the operator to take and place the material.

[0003] In addition, the powder cleaning cavity needs to maintain a positive pressure environment when the workpiece is cleaned. The powder cleaning cavity is filled with positive pressure gas and needs to maintain constant pressure. Generally, the following methods are used to achieve this: on the one hand, a micro-flow switch is arranged inside to compensate for the small leakage of the cavity to maintain the stability of the cavity pressure by controlling the small flow; on the other hand, the openable door structure of the cavity needs to be well sealed to ensure little leakage / no leakage.

[0004] However, because the pressure inside the positive pressure sealing door is generally higher than the pressure outside the door, when the door has a large force area, the door bolt of the door lock bears a large concentrated load. The door bolt produces a small displacement relative to the opening direction of the door, which causes the locking part of the sealing door to fail and the leakage to increase, so that the internal pressure cannot be constant. SUMMARY

[0005] The present application aims to overcome the defects of the prior art and provide a locking mechanism and a powder cleaning device to solve at least one of the above technical problems.

[0006] The present application is implemented as follows:

[0007] The present application provides a locking mechanism, comprising:

[0008] A locking body;

[0009] The swing rod device is rotatably installed on the locking body, and a first rotation axis is formed between the swing rod device and the locking body;

[0010] The locking bolt has a pressing surface and is rotatably installed on the swing rod device, a second rotation axis is formed between the locking bolt and the swing rod device, and the second rotation axis is parallel to the first rotation axis;

[0011] The locking device has a cam, the cam is rotatably installed on the locking body, and the locking bolt is located on a rotation track of a protruding part of the cam.

[0012] Further, the swing rod device comprises at least two groups of connecting rods, one end of each of the connecting rods is rotatably connected to the locking body through a swing connecting rod shaft, and the other end of each of the connecting rods is rotatably connected to the locking bolt through a locking bolt shaft.

[0013] Further, a torsional spring is sleeved on the swing connecting rod shaft, and one pin of the torsional spring is connected to the locking body.

[0014] Further, the connecting rods are four groups, two groups of the connecting rods are located on one side of the locking bolt, the other two groups of the connecting rods are located on the other opposite side of the locking bolt, and the two groups of the connecting rods located on the same side and the locking bolt and the locking body form a four-bar mechanism.

[0015] Further, the connecting rods are in V-shaped, and the V-shaped openings of the two groups of the connecting rods located on the same side are oppositely arranged.

[0016] Further, a lock cover plate is arranged on the locking body, the lock cover plate is oppositely arranged with the locking bolt and located on two sides of the cam respectively, a limiting screw is arranged on the lock cover plate, and the limiting screw is located on the rotation path of the protruding part of the cam.

[0017] The embodiment of the present application also provides a powder cleaning device, which comprises a powder cleaning cavity, a discharge port and a main door plate movably blocking the discharge port are arranged on the powder cleaning cavity, and the above-mentioned locking mechanism is arranged on the powder cleaning cavity.

[0018] After the main door plate blocks the discharge port, the cam is rotated, and the pressing surface of the locking bolt extrudes the main door plate.

[0019] Further, the locking mechanism has two groups, the cams of the two groups of the locking mechanism are located on the same cam shaft, and the cam shaft is located on the rotation axis of the cam.

[0020] Further, a particulate matter monitor is arranged on the powder cleaning cavity, and after the powder cleaning is completed, the particulate matter monitor monitors the dust in the powder cleaning cavity to reach a preset value, and the extrusion of the locking bolt on the main door plate is released.

[0021] Further, a top opening integral with the discharge port is formed at the top of the powder cleaning cavity, and a top door translation assembly and a top door upward pulling assembly are arranged at the top of the powder cleaning cavity.

[0022] The top door upward pulling assembly drives the top door plate to move in the vertical direction to open or close the top opening.

[0023] The top door translation assembly drives the top door plate to move horizontally.

[0024] The present application has the following advantages:

[0025] In the locking mechanism, the locking bolt is driven to move by rotating the cam about its own axis, and the locking bolt is connected to the locking body through the swing rod device, so that the cam can drive the locking bolt to swing relative to the locking body. When the locking mechanism is applied to the powder cleaning cavity, the swing of the locking bolt can provide stable pressing force to the main door plate, ensuring the locking effect of the main door plate. In addition, in the locking mechanism, the cam is self-locked during the swing movement of the locking bolt. When there is a large manufacturing and operation error, the locking mechanism can still be reliably locked through the redundant operation angle design.

[0026] The powder cleaning device provided by the present application can still achieve reliable locking when the locking bolt is subjected to a large concentrated load under the condition that the internal pressure of the powder cleaning cavity is high, preventing the leakage of internal inert gas and maintaining the stability of the internal gas pressure. At the same time, the powder cleaning device can also reduce the leakage of dust, improve the safety and reliability of powder cleaning, and reduce the cost. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0028] Figure 1 The structure schematic diagram of the locking mechanism from the first perspective according to the embodiment of the present application;

[0029] Figure 2 The structure schematic diagram of the locking mechanism from the second perspective according to the embodiment of the present application;

[0030] Figure 3 The structure schematic diagram of the locking device cooperating with the swing rod device according to the embodiment of the present application;

[0031] Figure 4 The structure schematic diagram of the powder cleaning cavity cooperating with the lifting device from the first perspective according to the embodiment of the present application;

[0032] Figure 5 A second perspective view of the structure of the powder cleaning cavity cooperating with the lifting device is provided for the embodiment of the present application.

[0033] Figure 6 A structure view of the sealing state of the powder cleaning cavity is provided for the embodiment of the present application.

[0034] Figure 7 A structure view of the opening state of the powder cleaning cavity is provided for the embodiment of the present application.

[0035] Figure 8 A structure view of the powder cleaning cavity after the top opening is opened is provided for the embodiment of the present application.

[0036] Figure 9 A structure view of the top door upper pulling assembly is provided for the embodiment of the present application.

[0037] Figure 10 A structure view of the main door plate of the powder cleaning cavity controlled to be opened by the air cylinder is provided for the embodiment of the present application. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. 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 other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0039] Referring to Figures 1-10 The locking mechanism provided by the embodiments of the present application can lock the door plate and the like by extrusion, which can be applied to the powder cleaning cavity, for example. The powder cleaning cavity has a discharge port, and the main door plate can block the discharge port. The locking mechanism can lock the main door plate on the powder cleaning cavity.

[0040] Specifically, the locking mechanism includes a locking body, a swing rod device, a locking pin, and a locking device.

[0041] The locking body is the main body of the locking mechanism, which can be installed on the component to be locked. For example, when the locking mechanism is used to lock the main door plate on the powder cleaning cavity, the locking body is installed on the powder cleaning cavity.

[0042] The swing rod device is rotatably installed on the locking body, and the two have a first rotation axis. Generally, the locking body is a frame structure, and the swing rod device is arranged on the inner side of the locking body and can be rotatably connected to the locking body at multiple points. Therefore, the first rotation axis has multiple first rotation axes, and each first rotation axis is arranged in parallel.

[0043] The locking bolt is a working part, and has a pressing surface to press the main door panel on the powder cleaning cavity. The locking bolt is connected with the locking body through the swing rod device, and is rotatably connected with the swing rod device. The two have a second rotation axis, which is parallel to the first rotation axis. Of course, the locking bolt and the swing rod device also have multiple connection points, and each second rotation axis is also parallel to each other to ensure the stability of the movement of the locking bolt.

[0044] The locking device has a cam, which is rotatably arranged on the locking body, and the locking bolt is located on the rotation track of the protruding part of the cam. The locking device is a driving part of the locking mechanism. The cam can rotate around its own axis, and during rotation, the protruding part of the cam drives the locking bolt to move. Since the locking bolt is connected with the locking body through the swing rod device, the movement of the locking bolt is swinging, thereby realizing the locking function.

[0045] In this embodiment, the locking mechanism drives the locking bolt to swing through the rotation of the cam, which indicates that the locking process has a dead point, and the self-locking is realized through the dead point. In the dead point state, the locking mechanism can provide stable locking force, which is very suitable for the positive pressure locking of the powder cleaning cavity. In addition, since the process uses cam rotation to realize self-locking, even in the case of large manufacturing and operation errors, through the design of redundant operation angle, reliable locking can still be achieved.

[0046] Specifically, the locking device 6 further includes a cam shaft 62, a bearing 63, a spacer sleeve 64, a color disc 65, and a locking handle 66. The locking device 6 is rotatably constrained on the locking body 8 through the bearing 63. The locking body 8 is a mounting frame mounted on the powder cleaning cavity 1. The bearing 63 rotatably sets the cam shaft 62. The cam shaft 62 is uniformly provided with the spacer sleeve 64 to limit the cam shaft 62. The cam 61 is fixedly constrained at the middle position of the cam shaft 62. The color disc 65 is installed on the cam shaft 62 in a fixed connection relationship. The color disc 65 has two color patterns. The locking body 8 is provided with a scale disc 83. The color disc 65 is located inside the scale disc 83. The scale disc 83 is provided with a window corresponding to the color disc 65. The corresponding color pattern of the color disc 65 can be observed through the window. Therefore, the operator can clearly observe the corresponding pattern of the color disc 65 through the window of the scale disc 83 to determine whether the locking device 6 is in the locking / release state. The locking bolt 110 is located on the rotation track of the protruding part of the cam 61. Therefore, when the rotation of the cam shaft 62 is controlled, the protruding part of the cam 61 gradually contacts the locking bolt 110, thereby pushing the locking bolt 110 to move. Of course, when the rotation of the cam shaft 62 is manually controlled, the locking handle 66 provided at one end of the cam shaft 62 is located outside the scale disc 83. The synchronous rotation of the cam shaft 62 is realized by controlling the rotation of the locking handle 66.

[0047] In the preferred embodiment, a lock cover plate 81 is arranged on the locking body 8, and a limiting screw 82 is arranged on the inner side of the lock cover plate 81, the limiting screw 82 is located in the rotating path of the protruding part of the cam 61, and the limiting screw 82 can limit the continuous rotation of the cam 61. In addition, by adjusting the length of the limiting screw 82 invading the rotating path of the protruding part of the cam 61, the rotation angle of the cam 61 can be adjusted, and the movement track of the locking bolt 110 can be adjusted.

[0048] The refined swing lever device 7 includes a locking bolt shaft 71, a swing link set, a swing link shaft 72, a swing arm torsional spring 73, and a link bearing 74. The locking bolt 110 and the swing lever device 7 are located on the inner side of the locking body 8. The swing link set includes four groups of links 75, two groups of links 75 are located on one side of the locking bolt 110, and the other two groups of links 75 are located on the other side of the locking bolt 110. One end of each group of links 75 is rotatably connected to the locking body 8 through the swing link shaft 72, and the other end is rotatably connected to the locking bolt 110 through the locking bolt shaft 71. Thus, the two groups of links 75 on the same side, the locking bolt 110, and the locking body 8 form a parallelogram structure. In order to realize smooth rotation and ensure service life, the swing link shaft 72 and the swing link 75 are connected through the link bearing 74. In the preferred embodiment, the swing arm torsional spring 73 is arranged on the two links 75 of the swing link set. Specifically, the swing arm torsional spring 73 is sleeved on the swing link shaft 72. One pin of the swing arm torsional spring 73 is connected to the locking body 8, which can generate counterclockwise torque on the swing link set. When the cam shaft 62 of the locking device 6 rotates, the locking bolt 110, the link 75, and the locking body 8 form a four-bar mechanism, so that the protruding part of the cam 61 pushes the locking bolt 110 to swing around the locking body 8. Of course, the so-called four-bar mechanism here is not a standard parallelogram. For example, the link 75 can be V-shaped, and the V-shaped openings of the two links 75 in the same four-bar mechanism are arranged opposite to each other to ensure the stability of the structure.

[0049] When the locking mechanism is applied to the powder cleaning chamber 1, the locking operation is as follows: referring to the rotation direction on the dial 83, control the locking handle 66 to rotate 90° clockwise until the color dial 65 reveals green, which means the locking handle 66 is in place. At this time, the end of the locking handle 66 is within the effective detection distance of the induction switch, and feedback information is sent to the control system, indicating that the locking handle 66 is locked in place. At this time, the locking bolt 110 is in contact with the main door panel 15, forming a switching circuit, and feedback information is sent to the control system, indicating that the locking is in place. During the locking operation, the locking device 6 and the rocker arm device 7 move as follows: the locking handle 66 drives the cam 61 to rotate clockwise, and the larger radius section begins to press down on the locking bolt 110. At this time, under the pre-tensioning action of the reverse torque of the rocker arm torsion spring 73, the locking bolt 110 and the cam 61 are always in close contact, driving the locking bolt 110 and the connecting rod 75 to swing clockwise forward around the lock body 8 until the cam 61 hits the limit screw 82 of the lock cover plate 81, at which point the operation of the locking handle 66 stops, and the locking is in place. Furthermore, the cam 61 has a constant radius within a certain angle range, ensuring that the locking device 6 can still reliably lock within the allowable rotational operation error range.

[0050] Release Operation: Referring to the rotation direction of the indicator 83, rotate the locking handle 66 counterclockwise by 90° until the color dial 65 reveals red. This indicates that the locking handle 66 is in the correct position. At this point, the end of the locking handle 66 is no longer within the effective detection range of the induction switch, and feedback information is sent to the control system, indicating that the locking handle 66 is locked in place. At this time, the locking bolt 110 is not in contact with the sealed door, and feedback information is sent to the control system, indicating that the lock is released. During the release operation, the locking device 6 and the swing arm device 7 move as follows: The locking handle 66 drives the cam 61 to rotate counterclockwise. The cam 61 touches the release limit screw 82 of the lock cover plate 81, stopping the operation of the locking handle 66. The swing arm 75 is lifted upward under the action of the swing arm torsion spring 73, separating the locking bolt 110 from the main door panel 15 until the upper surface of the locking bolt 110 contacts the lower surface of the cam 61. At this point, the release action of the main door panel 15 is completed.

[0051] This invention also provides a powder cleaning device, including a powder cleaning chamber 1 and the aforementioned locking mechanism. The powder cleaning chamber 1 is provided with a discharge port 12 and a main door plate 15 that movably blocks the discharge port. The locking mechanism is installed on the powder cleaning chamber 1. When the main door plate 15 blocks the discharge port 12, the rotating camshaft 62 causes the pressing surface of the locking bolt 110 to press against the main door plate 15, thereby locking the main door plate 15.

[0052] In the preferred embodiment, the main door plate 15 is rotatably opened, that is, one side is rotatably connected to the powder cleaning cavity 1 through a hinge shaft, and a locking mechanism is arranged on the opposite side (movable side). For the main door plate 15 provided with multiple sets of locking devices 6 and swing rod devices 7, generally two sets, each set of locking devices 6 is sequentially and spacedly arranged, and the cam shafts 62 of each set of locking devices 6 are located on the same axis and form an integral structure, that is, each set of locking devices 6 uses the same cam shaft 62, and a locking handle 66 is arranged in the middle of the cam shaft 62. By rotating the locking handle 66, the synchronous action of the locking bolt 110 corresponding to each set of locking devices 6 can be controlled, which is not only convenient to operate, but also has high consistency.

[0053] In the preferred embodiment, the main door plate 15 is rotatably opened, that is, one side is rotatably connected to the powder cleaning cavity 1 through a hinge shaft, and a locking mechanism is arranged on the opposite side (movable side). For the main door plate 15 provided with multiple sets of locking devices 6 and swing rod devices 7, generally two sets, each set of locking devices 6 is sequentially and spacedly arranged, and the cam shafts 62 of each set of locking devices 6 are located on the same axis and form an integral structure, that is, each set of locking devices 6 uses the same cam shaft 62, and a locking handle 66 is arranged in the middle of the cam shaft 62. By rotating the locking handle 66, the synchronous action of the locking bolt 110 corresponding to each set of locking devices 6 can be controlled, which is not only convenient to operate, but also has high consistency.

[0054] In the preferred embodiment, the main door plate 15 is rotatably opened, that is, one side is rotatably connected to the powder cleaning cavity 1 through a hinge shaft, and a locking mechanism is arranged on the opposite side (movable side). For the main door plate 15 provided with multiple sets of locking devices 6 and swing rod devices 7, generally two sets, each set of locking devices 6 is sequentially and spacedly arranged, and the cam shafts 62 of each set of locking devices 6 are located on the same axis and form an integral structure, that is, each set of locking devices 6 uses the same cam shaft 62, and a locking handle 66 is arranged in the middle of the cam shaft 62. By rotating the locking handle 66, the synchronous action of the locking bolt 110 corresponding to each set of locking devices 6 can be controlled, which is not only convenient to operate, but also has high consistency.

[0055] Based on the above optimization scheme, when it is necessary to seal the powder cleaning cavity 1, the two sets of air cylinders 112 are contracted to drive the main door plate 15 to rotate from the horizontal state to the vertical state, at which time the main door plate 15 is sent to the locking device corresponding to the motor, and the motor drives the cam shaft 62 to rotate, so that the locking bolt 110 presses the main door plate 15; on the contrary, when it is necessary to open the powder cleaning cavity 1, for example, when the dust in the powder cleaning cavity 1 reaches a preset value, the motor drives the cam shaft 62 to rotate in the opposite direction, the locking bolt 110 releases the pressing of the main door plate 15, and when the motor stops working, the air cylinder 112 receives the extension signal, and the air cylinder 112 is extended to drive the main door plate 15 to rotate from the vertical state to the horizontal state.

[0056] In an embodiment, the powder cleaning cavity 1 is provided with particle monitors 13, and the particle monitors 13 are arranged at positions close to the upper end and the lower end of the powder cleaning cavity 1, and each particle monitor 13 is set with a preset value, and only when the actual value monitored by each particle monitor 13 is less than the preset value, the discharge port 12 of the powder cleaning cavity 1 is automatically opened. Generally, the top of the powder cleaning cavity 1 has a top opening 11, and only when the actual value monitored by each particle monitor 13 is less than the preset value, the top opening 11 of the powder cleaning cavity 1 is automatically opened.

[0057] In the embodiment of the present application, when the powder is cleaned and taken out:

[0058] The printed forming cylinder is placed in the powder cleaning station, and at this time the forming cylinder has a printed workpiece 2, the forming cylinder is located directly below the powder cleaning cavity 1, and the upper port of the forming cylinder is docked with the lower port of the powder cleaning cavity 1; the powder cleaning cavity 1 is sealed, and a protective gas is introduced into the powder cleaning cavity 1. Generally, before the forming cylinder is docked with the powder cleaning cavity 1, the end cap seals the upper port, and after the forming cylinder is docked with the powder cleaning cavity 1, the forming cylinder is uncovered, and the internal space of the forming cylinder and the powder cleaning cavity 1 is an integral whole; in addition, the aforementioned sealing is not complete sealing, but dynamic sealing, and inert gas is introduced into the powder cleaning cavity 1 as a protective gas, which can be argon, the air in the powder cleaning cavity 1 is replaced by the protective gas, and when the oxygen content in the powder cleaning cavity 1 is lower than a set value, the introduction of the protective gas can be stopped.

[0059] After the protective gas reaches the required concentration, the powder cleaning operation on the workpiece 2 can be performed.

[0060] After the powder cleaning is completed, when the actual value monitored by each particle monitor 13 is less than the preset value, the top opening 11 and the discharge port 12 of the powder cleaning cavity 1 are automatically opened.

[0061] The lifting appliance 5 is inserted into the powder cleaning cavity 1 through the top opening 11 of the powder cleaning cavity 1 to lift the workpiece 2, and the workpiece 2 is controlled to be horizontally lifted out of the powder cleaning cavity 1 through the discharge port 12. Specifically, the top opening 11 and the discharge port 12 are an integral whole, the top opening 11 is located at the top of the powder cleaning cavity 1, and the discharge port 12 is located on one of the side walls of the powder cleaning cavity 1, when the top opening 11 and the discharge port 12 are opened, the worker needs to enter the powder cleaning cavity 1 to unlock the substrate from the forming cylinder, after the lifting appliance 5 is inserted into the powder cleaning cavity 1 through the top opening 11, the lifting appliance 5 is tied with the workpiece 2, the lifting appliance 5 first lifts the workpiece 2 to a certain height, and then controls the workpiece 2 to be horizontally moved out of the powder cleaning cavity 1 through the discharge port 12.

[0062] In a preferred scheme, the top opening 11 of the powder cleaning cavity 1 is plugged by a top door plate 14, and when the top opening 11 is opened, the top door plate 14 is first controlled to move vertically upward, and then moves horizontally away from the discharge port 12.

[0063] Specifically, the top door translation driving assembly 3 and the top door upper pulling assembly 4 are arranged at the top of the powder cleaning cavity 1. The top door upper pulling assembly 4 controls the upward and downward pressing actions of the top door plate 14. After the top door plate 14 is translated to the position, the top door upper pulling assembly 4 extends downward to press the top door plate 14 at the top opening 11 of the powder cleaning cavity 1, thereby realizing the sealing of the top opening 11. Conversely, the upward movement completes the opening of the top opening 11.

[0064] The top door upper pulling assembly 4 includes an upper pulling cylinder 41, an upper pulling base plate 42, universal ball bolts 43, pulling plates 44, screw bearing 45, linear bearing sets 46, and guide strips 47.

[0065] The upper pulling cylinder 41 is fixed to the upper pulling base plate 42. The linear bearing sets 46 are arranged on the upper pulling base plate 42 and can play a guiding role in the vertical direction. The top door plate 14 is connected to the upper pulling base plate 42 through the linear bearing sets 46 and the upper pulling cylinder 41. Specifically, when the upper pulling cylinder 41 generates a vertical force on the top door plate 14, the top door plate 14 can move vertically along the linear bearing sets 46. For example, when the upper pulling cylinder 41 controls the top door plate 14 to move upward vertically, the top door plate 14 unblocks the top opening 11 of the powder cleaning cavity 1. Conversely, when the upper pulling cylinder 41 controls the top door plate 14 to move downward vertically, the top door plate 14 can be pressed on the powder cleaning cavity 1, thereby realizing the sealing of the top opening 11 of the powder cleaning cavity 1. Generally, four sets of linear bearing sets 46 are arranged corresponding to the four corners of the top door plate 14. Two sets of upper pulling cylinders 41 are arranged at the middle positions of the two opposite edges of the top door plate 14.

[0066] The guide strips 47 are arranged on the powder cleaning cavity 1. The two sets of guide strips 47 are arranged in parallel and are perpendicular to the discharge port 12. The two sets of guide strips 47 are located on the opposite sides of the top opening 11. The pulling plates 44 are arranged on the opposite sides of the upper pulling base plate 42. The screw bearings 45 are arranged on the two pulling plates 44. The screw bearings 45 can be an even number, such as two, four, or six. The corresponding screw bearings 45 on the two pulling plates 44 are the same and correspond to the two sets of guide strips 47. The guide strips 47 have sliding grooves extending along the length direction. Each screw bearing 45 is slidingly arranged in the sliding groove of the corresponding guide strip 47. Thus, the upper pulling base plate 42 can be driven to slide along the two sets of guide strips 47 under the action of the translation driving assembly. In addition, the universal ball bolts 43 are arranged on the pulling plates 44 and are located outside the guide strips 47. The universal ball bolts 43 can be arranged perpendicular to the length direction of the guide strips 47. The guide strips 47 are at least partially arranged between the universal ball bolts 43 and the screw bearings 45, thereby preventing the top door plate 14, the pulling plates 44, and the upper pulling base plate 42 from deviating during translation.

[0067] The top door translation driving assembly 3 comprises a synchronous belt pull plate 31, a synchronous belt 32, a driving motor 33, a universal joint 34, a bearing set 35, a driving pulley 36, a driven pulley 37 and a driving shaft 38; the driving motor 33 and the bearing set 35 are fixed on the powder cleaning cavity 1, the bearing set 35 is sleeved on the driving shaft 38, and the two are in a rotatable connection relationship, the driving shaft 38 is fixed with the driving pulley 36, the driving motor 33 is connected with the driving shaft 38 through the universal joint 34, so as to control the rotation of the driving pulley 36, and the driving transmission is formed through the synchronous belt 32, the synchronous belt pull plate 31 and the driven pulley 37. The synchronous belt pull plate 31 is installed on the upper pull base plate 42 and located between the driven pulley 37 and the driving pulley 36. When the driving pulley 36, the synchronous belt 32 and the driven pulley 37 cooperate to form a belt drive, the synchronous belt 32 can drive the synchronous belt pull plate 31 to move linearly between the driving pulley 36 and the driven pulley 37. Of course, the linear movement direction is the same as the extension direction of the guide strip 47, and the synchronous belt pull plate 31 can drive the upper pull base plate 42 to move linearly along the guide strip 47. Generally, the driving pulley 36, the synchronous belt 32 and the driven pulley 37 are provided with two sets of transmission structures, which are respectively located on the opposite sides of the upper pull base plate 42. Thus, one driving motor 33 can control two sets of transmission structures to work synchronously, and then two sets of synchronous belt pull plates 31 can drive the upper pull base plate 42 to move horizontally. In the preferred embodiment, the driving motor 33, the universal joint 34, the bearing set 35, the driving pulley 36 and the driving shaft 38 are arranged on the side of the powder cleaning cavity 1 away from the discharge port 12, and the driven pulley 37 is arranged on the side of the powder cleaning cavity 1 close to the discharge port 12. Thus, when the top door translation driving assembly 3 controls the upper pull base plate 42 and the top door plate 14 to move horizontally and synchronously to open the top opening 11, the driving shaft 38 does not separate the discharge port 12 and the top opening 11 into two parts, so that the workpiece 2 can be smoothly lifted out of the discharge port 12 without being lifted out of the powder cleaning cavity 1.

[0068] Based on the above top door up-pulling assembly 4 and the top door translation driving assembly 3, when the forming cylinder moves to the powder cleaning station and is connected with the powder cleaning cavity 1, the driving motor 33 obtains the signal of sealing the powder cleaning cavity 1 and starts to work, it drives the up-pulling base plate 42 to move linearly along the guide strip 47 to the direction of approaching the discharge port 12, and when the up-pulling base plate 42 moves to the position, the driving motor 33 stops working, and the up-pulling cylinder 41 starts to work, and drives the top door plate 14 to move vertically downward to block the top opening 11. In the preferred embodiment, the vertical downward movement of the top door plate 14 has two actions, first, the up-pulling cylinder 41 drives the top door plate 14 to move vertically downward to contact the powder cleaning cavity 1, in this action, the top door plate 14 moves vertically downward by a certain distance, then the up-pulling cylinder 41 drives the top door plate 14 to move downward, the up-pulling cylinder 41 generates a certain downward force on the top door plate 14, so that the top door plate 14 and the powder cleaning cavity 1 form a better sealing effect. When it is needed to open the top opening 11 of the powder cleaning cavity 1, the up-pulling cylinder 41 receives the opening instruction, it drives the top door plate 14 to move upward, the top opening 11 is opened, when the top door plate 14 moves to the position, the up-pulling cylinder 41 stops working, at this time the driving motor 33 starts to drive the up-pulling base plate 42 to move away from the discharge port 12, until the top door plate 14 and the top opening 11 are completely overlapped in the horizontal direction.

[0069] In addition, in the preferred embodiment, when it is needed to seal the powder cleaning cavity 1, the main door plate 15 first blocks the discharge port 12, then the top door up-pulling assembly 4 and the top door translation driving assembly 3 control the top door plate 14 to block the top opening 11, and the edge of the top door plate 14 will press down the top of the main door plate 15, so that the top door plate 14 and the main door plate 15 form a better sealing effect; when it is needed to open the powder cleaning cavity 1, the top door up-pulling assembly 4 and the top door translation assembly first control the top door plate 14 to open the top opening 11, then the main door plate 15 opens the discharge port 12.

[0070] In one embodiment, after the powder cleaning is completed, the powder particles in the powder cleaning cavity 1 are extracted through the vacuum suction port 16, and when the dust in the powder cleaning cavity 1 reaches a preset value, the vacuum suction port 16 stops working. In this embodiment, the dust in the powder cleaning cavity 1 is eliminated in two ways: one is by sedimentation, and the other is by extracting the gas in the powder cleaning cavity 1 using the vacuum suction port 16. Based on the way of eliminating dust by the vacuum suction port 16, multiple sets of vacuum suction ports 16 are arranged on the powder cleaning cavity 1, some of which are arranged near the upper part of the powder cleaning cavity 1, and some of which are arranged near the lower part of the powder cleaning cavity 1. A particulate matter monitor 13 is arranged at each vacuum suction port 16, and a threshold value of the particulate matter monitor 13 is set. When the particulate matter content detected by the particulate matter monitor 13 is lower than the threshold value for a fixed time, the vacuum suction port 16 stops working. In one embodiment, a particulate matter monitor 13 can be arranged to integrally judge the particulate matter content in the powder cleaning cavity 1 by light scattering method. According to the arrangement position of the vacuum suction port 16, the space of the powder cleaning cavity 1 is divided into multiple areas. When the particulate matter content in one or more areas detected by the particulate matter monitor 13 is relatively high, the vacuum suction port 16 corresponding to the area starts to work.

[0071] The above embodiment is optimized by adding a circulating filter. The gas extracted by the vacuum suction port 16 is subjected to gas-solid separation by the circulating filter, and the separated gas can be collected in a gas bag. Specifically, during the dust treatment process of the powder cleaning cavity 1, the gas in the powder cleaning cavity 1 is mainly protective gas, so the gas after gas-solid separation is mainly protective gas, and the separated protective gas can be collected in a gas bag. When it is necessary to introduce protective gas into the powder cleaning cavity 1, the protective gas collected in the gas bag can be introduced into the powder cleaning cavity 1.

[0072] Further, the oxygen concentration of the extracted gas is detected at the vacuum suction port 16, and when the oxygen concentration is less than a set value, the extracted gas is introduced into the gas bag after gas-solid separation, and when the oxygen concentration exceeds the set value, the extracted gas is discharged to the environment after gas-solid separation. In this embodiment, when the vacuum suction port 16 extracts the gas in the powder cleaning cavity 1, in order to ensure the balance of the air pressure inside and outside the powder cleaning cavity 1, the outside air will gradually enter the powder cleaning cavity 1. When the oxygen concentration detected by the vacuum suction port 16 is relatively high (exceeds the set value), it indicates that the air content in the gas extracted by the vacuum suction port 16 is relatively high, and the protective gas concentration is low, which indicates that the separated gas is not suitable for being used as protective gas. On the contrary, when the detected oxygen concentration is relatively low, the separated gas can be reused as protective gas.

[0073] In an embodiment, a distance measuring sensor 17 is arranged in the powder cleaning cavity 1, and the distance measuring sensor 17 is preset with a safety distance, and when the distance between the workpiece 2 and the distance measuring sensor 17 is less than the safety distance during the process of lifting the workpiece 2 out of the powder cleaning cavity 1, the lifting process of the workpiece 2 is paused. In this embodiment, the distance measuring sensor 17 is arranged at the position close to the discharge port 12 of the powder cleaning cavity 1, and multiple groups of distance measuring sensors 17 are arranged in the vertical direction in sequence. When the lifting device 5 is moving the workpiece 2, the data information detected by the distance measuring sensor 17 is transmitted to the control system of the lifting device 5, and when the detected data information is less than the preset safety distance, the sound and light alarm 111 sends an alarm, and the sound and light alarm 111 displays red light. When the detected data information is less than the preset safety distance and the data information continues to decrease, the lifting device 5 pauses the moving action of the workpiece 2. For the preferred solution, the distance measuring sensor 17 only transmits the detected data to the control system of the lifting device 5 when the lifting device 5 is lifting the workpiece 2, and when the workpiece 2 is not being lifted, the data information detected by the distance measuring sensor 17 will not be transmitted to the control system of the lifting device 5, so that the lifting device 5 will not be paused due to the too small data detected by the distance measuring sensor 17. The sound and light alarm 111 can also be used for dust raising treatment of the powder cleaning cavity 1. Specifically, when the dust raising in the powder cleaning cavity 1 reaches the preset requirement, the sound and light alarm 111 also sends an alarm, at this time the sound and light alarm 111 displays green light, and at this time the powder cleaning cavity 1 is opened.

[0074] The above embodiment is optimized, and the horizontal position of the lifting point relative to the workpiece 2 when the workpiece 2 is lifted stably is preset, and when the lifting device 5 actually lifts the workpiece 2, the horizontal position of the lifting point of the lifting device 5 relative to the workpiece 2 is collected by the camera, and the detected horizontal position is compared with the preset horizontal position, and when the deviation between the two exceeds the warning point, the lifting device 5 stops working. For example, when the workpiece 2 has a symmetrical structure, the ideal lifting point position of the workpiece 2 is in the center of the vertical projection of the upper surface of the workpiece 2. Therefore, in the actual lifting process, in order to keep the workpiece 2 stable during lifting, the position of the lifting point after lifting should be controlled as close as possible to the center of the vertical projection of the upper surface of the workpiece 2. When the vertical projection of the actual lifting point position deviates from the center of the upper surface of the workpiece 2 by a large distance, the workpiece 2 will obviously roll over (or tilt) after lifting, which not only affects the stability of the workpiece 2 during lifting, but also easily causes the workpiece 2 to collide with the powder cleaning cavity 1. In this embodiment, the position of the lifting point during lifting is collected by the camera in real time, and compared with the preset position, thereby ensuring the safety of the material taking process.

[0075] The application further provides an embodiment, the whole of the powder cleaning cavity 1 is in a frame structure, in addition to the top opening 11 and the discharge port 12, side windows 18 are arranged on each side wall, and the corresponding side windows 18 are closed by side door plates 19. Specifically, when the powder cleaning cavity 1 needs to be sealed, the side door plates 19 are closed to close the corresponding side windows 18; when the dust in the powder cleaning cavity 1 reaches a preset value, the side wall of the powder cleaning cavity 1 needs to be opened, at this time, the side door plates 19 automatically open the corresponding side windows 18, and the staff unlocks and locks the base plate of the forming cylinder through the side windows 18, and when the staff exits the powder cleaning cavity 1, the side door plates 19 reseal the corresponding side windows 18, and at this time, the discharge port 12 is still in an open state.

[0076] The above merely describes preferred embodiments of the application and is not intended to limit the application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the application shall be included in the protection scope of the application.

Claims

1. A locking mechanism, characterized in that, include: Lock body; The rocker arm device is rotatably mounted on the lock body, and the two have a first axis of rotation between them; The locking bolt has a pressing surface and is rotatably mounted on the swing arm device, with a second rotation axis between them, and the second rotation axis is parallel to the first rotation axis; A locking device having a cam rotatably mounted on a locking body, wherein the locking bolt is located on the rotational trajectory of the cam's protrusion.

2. The locking mechanism as described in claim 1, characterized in that, The swing arm device includes at least two sets of connecting rods. One end of each connecting rod is rotatably connected to the locking body via a swing connecting rod shaft, and the other end is rotatably connected to the locking bolt via a locking bolt shaft.

3. The locking mechanism as described in claim 2, characterized in that, A torsion spring is sleeved on the swing linkage shaft, and one of the pins of the torsion spring is connected to the locking body.

4. The locking mechanism as described in claim 2, characterized in that, The linkage consists of four sets, with two sets located on one side of the locking bolt and the other two sets located on the opposite side of the locking bolt. The two sets of linkages on the same side, together with the locking bolt and the locking body, form a four-bar linkage.

5. The locking mechanism as described in claim 4, characterized in that, The connecting rod is V-shaped, and the V-shaped openings of two sets of connecting rods on the same side are arranged opposite each other.

6. The locking mechanism as described in claim 1, characterized in that, A lock cover plate is provided on the lock body. The lock cover plate and the locking bolt are arranged opposite to each other and are respectively located on both sides of the cam. A limit screw is provided on the lock cover plate. The limit screw is located on the rotation path of the protrusion of the cam.

7. A powder cleaning device, comprising a powder cleaning chamber, wherein the powder cleaning chamber is provided with a discharge port and a main door plate that can be movably blocked by the discharge port, characterized in that, It also includes a locking mechanism as described in any one of claims 1-6, the locking mechanism being mounted on the powder cleaning chamber; After the main door panel blocks the discharge port, the cam is rotated, and the pressing surface of the locking bolt presses against the main door panel.

8. The powder cleaning device as described in claim 7, characterized in that, The locking mechanism has two sets, and the cams of the two sets of locking mechanisms are located on the same camshaft, and the camshaft is located on the rotation axis of the cam.

9. The powder cleaning device as described in claim 7, characterized in that, The cleaning chamber is equipped with a particulate matter monitor; and after the cleaning is completed, the particulate matter monitor detects that the dust in the cleaning chamber reaches a preset value, and then releases the locking bolt from squeezing the main door panel.

10. The powder cleaning device as described in claim 7, characterized in that, A top opening integral with the discharge port is provided at the top of the powder cleaning chamber, and a top door sliding assembly and a top door pulling assembly are provided at the top of the powder cleaning chamber. The top door pull-up assembly drives the top door panel to move vertically to flexibly block the top opening; The top door translation component drives the top door panel to move horizontally.

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