Workpiece conveying device and shot blasting line

Abstract

The application discloses a workpiece conveying device and a shot blasting line. The workpiece conveying device comprises a conveying guide rail, a front horizontal moving guide rail, a front transfer trolley, a front transfer guide rail, a rear horizontal moving guide rail, a rear transfer trolley and a hanger group. The conveying guide rail comprises an upper guide rail and a lower guide rail arranged in parallel. The front horizontal moving guide rail is arranged at the head end of the conveying guide rail. The front transfer trolley runs on the front horizontal moving guide rail. The front transfer guide rail is arranged on the front transfer trolley and is used for changing the connection position with the upper guide rail or the lower guide rail through the movement of the front transfer trolley. The rear horizontal moving guide rail is arranged at the tail end of the conveying guide rail. The rear transfer trolley runs on the rear horizontal moving guide rail. The rear transfer guide rail is arranged on the rear transfer trolley and is used for changing the connection position with the upper guide rail or the lower guide rail through the movement of the rear transfer trolley. The hanger group runs on the conveying guide rail and the front and rear transfer guide rails and is used for hanging the workpiece. The workpiece conveying device is relatively compact in structure.

Description

TECHNICAL FIELD

[0001] The present application relates to a device for workpiece conveying in a shot blasting process, and also relates to a shot blasting line using the workpiece conveying device. BACKGROUND

[0002] Shot blasting is a common surface treatment process in the field of machinery, and belongs to a cold treatment process. It can be divided into shot blasting cleaning process and shot blasting strengthening process. The former is mainly used to remove the oxide scale and impurities on the surface of the workpiece to improve the appearance quality of the workpiece. In the shot blasting cleaning process of metal workpieces, the speed of the pellets can reach 60-80 m / s, and in the shot blasting cleaning process of non-metal workpieces, the speed of the pellets can reach 40-60 m / s. Shot blasting strengthening process is mainly applied to metal workpieces, and has a higher speed requirement for pellets than shot blasting cleaning. Usually, the pellets need to be accelerated to 60-100 m / s, so that the pellets continuously impact the surface of the workpiece to be strengthened, so that the surface and surface layer of the workpiece undergo the desired changes in the cyclic deformation process.

[0003] Since the speed of the pellets is very fast in both shot blasting cleaning and shot blasting strengthening, and has a killing ability, in order to ensure the continuity of shot blasting, a workpiece conveying device needs to be constructed so that the workers can be away from the shot blasting chamber to avoid injury accidents.

[0004] Typically, as disclosed in Chinese patent document CN107471120A, a multi-shot blasting chamber shot blasting machine is provided, which is essentially a shot blasting line including a conveying system provided with a feeding station and a discharging station and all shot blasting chambers along its path. Since there are specific feeding and discharging stations, and the feeding and discharging stations avoid injury accidents caused by the projection of the pellets. The conveying system includes a ring-shaped guide rail, and a set of hangers are arranged on the ring-shaped guide rail. The hangers pass through each station on the shot blasting line in sequence along the ring-shaped guide rail.

[0005] The ring-shaped guide rail has an inherent defect, i.e. when feeding and discharging, the hangers need to be stopped to complete the feeding and discharging. Since all the hangers of such a production line are driven by a single drive device, in other words, the entire production line needs to be stopped, which affects the continuity of the production of the shot blasting line. In the Chinese patent document CN107471120A, the hangers are uniformly hung by a ring-shaped guide chain, and the ring-shaped guide chain is a single drive chain for driving the hangers. When some hangers need to hang workpieces, the ring-shaped guide chain must be stopped, and it is impossible to stop in sections, resulting in the inability to achieve continuous production.

[0006] And the ring-shaped guide rail also has a defect, that is, a non-straight guide rail, such as an arc-shaped guide rail, needs to be configured. The existence of the arc-shaped guide rail extends the coverage of the ring-shaped guide rail, resulting in a relatively large overall floor area. The reason is that the radius of the arc-shaped guide rail is not easy to be too small. If it is too small, the angular velocity will be too large under the condition of the same linear velocity, and the centripetal acceleration will be large. Therefore, either a very low running speed is adopted, or a relatively large radius of the arc-shaped guide rail is adopted, so that the distance between the straight guide rails in the ring-shaped guide rail is large, resulting in a large overall floor area. And compared with the straight guide rail, the arc-shaped guide rail belongs to a low-speed guide rail. Due to the existence of the centripetal acceleration, the arc-shaped guide rail is prone to accidents. Not only is the efficiency low, but also the running reliability is poorer than that of the straight guide rail. SUMMARY

[0007] Therefore, the purpose of the present application is to provide a relatively compact workpiece conveying device. The present application also provides a shot blasting line provided with the workpiece conveying device.

[0008] According to a first aspect of the embodiment of the present application, a workpiece conveying device is provided for conveying workpieces on a shot blasting line. The workpiece conveying device comprises:

[0009] A conveying guide rail, comprising an upper guide rail and a lower guide rail arranged in parallel;

[0010] A front transverse guide rail located at the head end of the conveying guide rail;

[0011] A front transfer trolley running on the front transverse guide rail;

[0012] A front transfer guide rail mounted on the front transfer trolley for changing the connection position with the upper guide rail or the lower guide rail through the movement of the front transfer trolley;

[0013] A rear transverse guide rail located at the tail end of the conveying guide rail;

[0014] A rear transfer trolley running on the rear transverse guide rail;

[0015] A rear transfer guide rail mounted on the rear transfer trolley for changing the connection position with the upper guide rail or the lower guide rail through the movement of the rear transfer trolley;

[0016] A hanger group running on the conveying guide rail and the front and rear transfer guide rails for hanging the workpieces.

[0017] Optionally, a contact network is arranged along the conveying guide rail;

[0018] Correspondingly, the hanger group has a pantograph matched with the contact network.

[0019] Optionally, a anti-falling device is provided, which has:

[0020] The first form is a braking device arranged on the hanger group;

[0021] The second form is a device arranged on the front and rear transfer trolleys for locking the hanger group; or

[0022] The third form is a limiting device arranged on the workpiece conveying device, which is arranged between the upper and lower guide rails and outside the end of the conveying guide rail and is higher than the track surface of the conveying guide rail.

[0023] Optionally, the front and rear transfer guide rails are each provided with at least two.

[0024] Optionally, the hangers of the hanger group include electric hoists, and the hangers further include:

[0025] A track wheel set for cooperating with the corresponding guide rail, which at least includes a driving wheel;

[0026] A driving assembly for driving the driving wheel.

[0027] Optionally, an auxiliary positioning mechanism is included for auxiliary positioning after the front or rear transfer trolley is transferred into position.

[0028] Optionally, the auxiliary positioning mechanism includes:

[0029] A positioning component mounted or formed on the frame of the transfer trolley to provide a positioning opening parallel to the direction of the conveying guide rail;

[0030] A guide rod pair configured or mounted on the main frame of the workpiece conveying device, and the moving direction of the guide rod pair is parallel to the conveying guide rail, and the head of the guide rod is a wedge-shaped or conical head to be guided into the wedge-shaped pair when the transfer trolley is deviated.

[0031] Optionally, a detection device for detecting the lateral movement of the transfer trolley is arranged on the main frame of the workpiece conveying device to control the braking of the transfer trolley.

[0032] Optionally, the front transfer guide rail is located on the lower side of the front transfer trolley;

[0033] The rear transfer guide rail is located on the lower side of the rear transfer trolley;

[0034] The front and rear lateral movement guide rails each include two track members;

[0035] A sub-track pair is provided between the two track members, which is located on the upper side of the corresponding front and rear transfer trolleys to provide auxiliary guidance for the front and rear transfer trolleys.

[0036] According to a second aspect of the embodiments of the present application, a shot blasting line is provided, which comprises the workpiece conveying device of the first aspect of the embodiments of the present application to transfer the workpiece between the stations.

[0037] According to the workpiece conveying device of the embodiments of the present application, the swing device is used to replace the conventional arc-shaped track, and the minimum radius problem of the arc-shaped track does not need to be considered, so that the structure only needs to consider the spacing between the uplink and downlink straight tracks, and the structure is more compact. Moreover, if the radius of the arc-shaped track is relatively small, the angular velocity of the hanger group will be relatively large, and the derailment accident is prone to occur. In the embodiments of the present application, the tracks used are straight tracks, and the derailment accident will not occur. BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1 FIG. 1 is a top view of the structure of a shot blasting line according to an embodiment of the present application.

[0039] Figure 2 FIG. 2 is a front view of the structure of the shot blasting line according to the embodiment of the present application.

[0040] Figure 3 FIG. 3 is an enlarged view of A of FIG. 1. Figure 1

[0041] Figure 4 FIG. 4 is an enlarged view of B of FIG. 1. Figure 2

[0042] Figure 5 FIG. 5 is a top view of the structure of a swing trolley according to an embodiment of the present application.

[0043] Figure 6 FIG. 6 is a front view of the structure of the swing trolley according to the embodiment of the present application.

[0044] Figure 7 FIG. 7 is a left view of the structure of the swing trolley according to the embodiment of the present application.

[0045] Figure 8 FIG. 8 is a structure diagram of a trolley support according to an embodiment of the present application.

[0046] Figure 9 FIG. 9 is an enlarged view of C of FIG. 5. Figure 8

[0047] ​​​In the figure: 1. rear transfer trolley, 2. third transfer rail, 3. fourth transfer rail, 4. rear transfer drive, 5. rear rail support, 6. rear transverse rail, 7. upper rail, 8. spraying chamber, 9. drying chamber, 10. first cleaning device, 12. second cleaning device, 13. shot blasting chamber, 14. cooling chamber, 15. front transfer trolley, 16. first transfer rail, 17. second transfer rail, 18. workshop, 19. front rail support, 20. front transverse rail, 21. rear frame, 22. positioning plate, 23. linear bearing, 24. motor, 25. speed reducer, 26. rail wheel, 27. guide rod, 28. linear bearing, 29. seat plate, 30. air cylinder, 31. frame, 32. transfer rail, 33. guide wheel, 34. column, 35. X diagonal brace, 36. track seat, 37. longitudinal beam, 38. diagonal brace, 39. support, 40. vertical rod, 41. raceway. Embodiment

[0048] It should be understood that whether it is a loop line, for the uplink and downlink, those skilled in the art have a clear understanding.

[0049] It can be understood that for the uplink rail 7 and the downlink rail 11, for the conventional configuration, they are parallel to each other, in the direction of the uplink rail 7 and the downlink rail 11, that is, the longitudinal direction commonly said, and in the horizontal plane, the direction perpendicular to the uplink rail 7 and the downlink rail 11 is the transverse direction. Generally, the direction perpendicular to the horizontal plane or the plane determined by the longitudinal direction and the transverse direction is the vertical direction.

[0050] Generally, the transverse direction is also called the left-right direction, and determines the width; the longitudinal direction is also called the front-rear direction, and determines the head-tail and length; the vertical direction is also called the up-down direction, and determines the height.

[0051] For the convenience of description, in the embodiments of the present application, the uplink rail 7 and the downlink rail 11 are collectively referred to as conveying rails; and the front transfer trolley 15 and the rear transfer trolley 1 are collectively referred to as transfer trolleys, and the basic structure of the transfer trolley is not distinguished between front (head) and rear (tail) in the context of collective.

[0052] In order to simplify the description, the same or basically the same parts as the prior art are simplified, such as the main frame body composed of the column 34 system as exemplified in Figure 1 , 2 , and Figure 8 .

[0053] Specifically, the shot blasting line, that is, the shot blasting production line, is often a catenary line, and the conveying rail needs to be overhead, so that the hanger group runs in the form of a suspension rail assembly, in other words, the conveying rail needs to be supported to a certain height, which is irrelevant to the improvement content of the present application and belongs to the general common sense in the art.

[0054] The catenary line needs to pass through each station of the shot blasting line one by one, such as the shot blasting chamber 13 (shot blasting station), the spraying chamber 8 (spraying station), the drying chamber 9 (drying station) and the cooling chamber 14 (cooling station) shown in Figure 1 , respectively. It should be understood that for different shot blasting processes, the adapted procedures are not the same, Figure 1 The exemplified structure is only a shot blasting line. The focus of the improvement of the present application is to change the ring track into a form of the conveying guide rail matched with the transfer guide rail. The rest is basically not changed. Therefore, the rest of the shot blasting line is not described in the embodiments of the present application.

[0055] Correspondingly, the basic function of the workpiece conveying device is to convey the workpiece to a given station on the shot blasting line, and then convey the workpiece to the next station after the process at the station is completed, and so on.

[0056] The typical feature of the shot blasting line is that the ring line is generally used, in other words, the feeding station and the discharging station are relatively close to each other. If the conveying guide rail is taken as the reference, the feeding station and the discharging station are located at one end of the conveying guide rail. It can be known that the conveying guide rail should include the upward guide rail 7 and the downward guide rail 11.

[0057] Similarly, in the embodiments of the present application, the upward guide rail 7 and the downward guide rail 11 are also arranged in parallel, usually in parallel, so as to have a head end and a tail end.

[0058] It should be known that even the public has a clear understanding of the upward and downward. The upward generally refers to the path from the starting point to the target point, and the downward is the opposite. The downward can be understood as the return.

[0059] In the embodiments of the present application, the conveying guide rail is the main guide rail, including the upward guide rail 7 and the downward guide rail 11. Since the two are arranged in parallel, the distance between the two is mainly affected by the space occupied by the upward process equipment and the downward process equipment. Since the process equipment can be arranged at intervals to make full use of the space, the main space occupied by the conveying device is the conversion part of the material between the two conveying guide rails. Unlike the arc-shaped track which needs additional space for the layout of the arc-shaped track, in the embodiments of the present application, the main factor is the floor area occupied by the process equipment itself, and the size of the transfer trolley is relatively small.

[0060] Figure 7 The transfer guide rail 32 shown in

[0061] The form of the main guide rail and the transfer guide rail 32 can be exactly the same, and the specifications are also the same, in order to facilitate accurate bridging during the transfer.

[0062] The guide rails, including the shuttle rail 32 and the main guide rail, are installed using a method such as U-bolt suspension, with the main guide rail installed below the load-bearing beam. The load-bearing beam is supported on the upper end of the column 34 and includes longitudinal beams and transverse beams.

[0063] The columns 34 are reinforced by X-braces 35, and the lower ends of the columns 34 are installed on the ground of the workshop 18 by pre-embedded anchor bolts, so that the load-bearing beam has a given distance from the ground.

[0064] The upward guide rail 7 and the downward guide rail 11 define the head (front end) and tail (rear end) of the shot blasting line, and loading and unloading are completed at the head end of the shot blasting line. At the front end, there is a front transverse guide rail 20, which is fixedly installed on the upper part of the main frame and used for the lateral movement of the front shuttle trolley 15.

[0065] Accordingly, the front shuttle trolley 15 and the front transverse guide rail 20 cooperate to form a front transverse guide rail pair, which is used to shuttle the hanger group from the downward guide rail 11 to the upward guide rail 7.

[0066] Furthermore, a front shuttle guide rail is installed on the front shuttle trolley 15, such as... Figure 1 The first transfer guide rail 16 and the second transfer guide rail 17 shown can also be equipped with more front transfer guide rails on a transfer trolley, or there can be only one. When there are multiple rails, hangers can be hung sequentially. The front transfer guide rail that is full of hangers can be moved laterally to the upward guide rail 7 and bridged with the upward guide rail 7, so that the corresponding hangers can slide onto the upward guide rail 7 in sequence. At this time, the hangers on the remaining front transfer guide rails can hang workpieces, that is, load materials.

[0067] For the connection with the downward guide rail 11, follow the reverse order, first making... Figure 1 The first shuttle rail 16 on the upper guide rail 7 connects with the lower guide rail 11 to receive a predetermined number of hangers. It then moves laterally so that the second shuttle rail 17 receives the predetermined number of hangers. While the second shuttle rail 17 is receiving hangers, the hangers already on the first shuttle rail 16 can be used to hang workpieces. If there are more front shuttle rails, they can be used sequentially to receive hangers.

[0068] It should be noted that the speed at which workpieces are hung is usually much higher than the time required for processes such as shot blasting. Therefore, in terms of the efficiency of the transfer itself, the negative impact on the efficiency of the shot blasting line can be ignored.

[0069] Furthermore, it can be seen that the shuttle car can also be constructed as a workpiece cache library.

[0070] Regarding the drive of the front shuttle bus 15, inFigure 5 and Figure 6 As can be clearly seen from the illustrated structure, the content of the diagram also applies to the rear shuttle trolley 1. In the diagram, the shuttle trolley has four guide wheels 25, one at each of the four corners of the shuttle trolley frame, and one pair of guide wheels 25 are drive wheels.

[0071] Figure 5 In the process, each of the pair of guide wheels 26 used as drive wheels is equipped with an independent motor 24 and a reducer 25. The two guide wheels 26 used as drive wheels can also be synchronized using a transmission shaft, which is mechanical synchronization.

[0072] If an independent motor 24 is used, synchronization can be achieved in the electrical configuration.

[0073] For example, motor 24 can also be a servo motor or a stepper motor to more precisely control the driving amount of motor 24.

[0074] Figure 5 The four guide wheels 26 in the middle can also be configured as drive wheels to form a four-wheel drive structure, but it is not very necessary.

[0075] Referring to the configuration of the aforementioned front shuttle trolley 15, the rear shuttle trolley 1 can adopt the same configuration. Accordingly, a rear transverse guide rail 6 is provided for the rear shuttle trolley 1. The rear transverse guide rail 6 is mounted on the rear guide rail bracket 5, which is located on the upper part of the main frame and at the rear of the main frame, at the tail end of the conveying guide rail.

[0076] Referring to the configuration of the front shuttle trolley 15, the rear shuttle trolley 1 is equipped with a rear shuttle guide rail, such as... Figure 1 The third transfer rail 2 and the fourth transfer rail 3 are shown in the diagram. In use, the fourth transfer rail 3 first receives a predetermined number of fixtures transported from the upward rail 7. Then, the transfer trolley 1 moves laterally, bridging the third transfer rail 2 with the upward rail 7, and then receives the predetermined number of fixtures transported from the upward rail 7. The transfer trolley 1 then moves further laterally, bridging the fourth transfer rail 3 with the downward rail 11, and transporting the carried fixtures to the downward rail 11.

[0077] Regarding the distance between the third shuttle rail 2 and the fourth shuttle rail 3, in order to save space, the distance between them is smaller than the distance between the upward guide rail 7 and the downward guide rail 11, which is why the aforementioned rear shuttle trolley 1 experiences multiple lateral movements. Similarly, the same applies to the front shuttle trolley 15.

[0078] Overall, the shuttle trolley is used to change the position of the shuttle guide rail it carries. The first position is the connection (bridging) between the shuttle guide rail 32 and the upward guide rail 7, and the second position is the connection (bridging) between the shuttle guide rail 32 and the downward guide rail 11. It should be noted that when there are multiple shuttle guide rails 32, when one shuttle guide rail 32 is in the first position, the other guide rails may be in a suspended state. Therefore, for the shuttle guide rail 32, it is preferable to set a controllable limiting device at its bridging end to prevent, for example, the hanger from slipping under power failure conditions.

[0079] However, it should also be noted that, for example, the hanger can be equipped with a braking device. This braking device is a normally closed device, that is, when the hanger loses power, the braking device equipped with the hanger can lock the traveling wheels of the hanger, so that the hanger is in a locked position on the transfer guide rail 32. Even if the bridging end of the transfer guide rail 32 is suspended, the hanger will not fall off.

[0080] Given that the hanger moves along multiple tracks, traditional power supply methods are relatively difficult to implement. For example, in a circular track, wires can be laid along the circular track. However, in the embodiment of the present invention, when a certain shuttle rail 32 is disengaged from the conveying rail, the hanger it carries can be in a de-energized state. At this time, the position of the hanger can remain unchanged until the shuttle rail 32 is connected to, for example, the down rail 11, and then the hanger can be energized again.

[0081] In view of this, a contact wire is provided along the conveying guide rail. It should be understood that the provision along the conveying guide rail only indicates directional and basic positional requirements, and does not limit its extension length. However, it should be understood that the contact wire, in addition to covering the spatial length of, for example, the upward guide rail 7, extends further to the position of the shuttle trolley, so that when a certain shuttle guide rail 32 on the shuttle trolley is connected to, for example, the upward guide rail 7, the hanger on that shuttle guide rail 32 can be energized.

[0082] Accordingly, the mounting bracket has a pantograph that cooperates with the overhead contact line.

[0083] Given that the overhead contact line can be used not only as a power line but also as a signal line—that is, in some embodiments the overhead contact line can be a dual-network, simultaneously serving as a power grid and a signal grid—this is common knowledge in the field of overhead contact line and pantograph technology and will not be elaborated upon here. With a dual-network design, the overhead contact line, in addition to supplying power, also provides the electrical connection for the control signal circuitry of the mounting brackets.

[0084] Given that it is relatively feasible to lay the contact wire along the guide rail, but since the hanger moves both longitudinally and laterally (moving with the vehicle) relative to the transport guide rail on the transfer guide rail 32, it will be very difficult to lay the contact wire on the transfer trolley. Therefore, when the transfer guide rail 32 is separated from the transport guide rail, de-energizing the hanger will not affect the transfer of the transfer trolley.

[0085] In particular, when the transfer rail 32 is connected to the conveyor rail, a predetermined number of hangers can be moved to the transfer rail 32, which is currently connected to the conveyor rail. At this time, the predetermined number of hangers are arranged in sequence on the transfer rail 32. Even if there is a power failure, this arrangement will not change. At this time, it is only necessary to consider preventing the hangers from slipping off the transfer rail 32 if the transfer rail 32 is disconnected from the conveyor rail.

[0086] At this point, there is a natural situation where, since, for example, the ferry rail is set horizontally, there is no gravitational component force that would cause the hanger to slip off, as far as the ferry rail 32 itself is concerned.

[0087] However, for example, when a fixture moves from the upper guide rail 7 to a transfer guide rail 32, even if the fixture itself stops due to braking, the workpiece under the fixture still swings forward due to inertia. Since the fixture has stopped due to braking, the workpiece will swing back after reaching its highest position, forming a reciprocating oscillation, and this oscillation cannot stop in a short time. When the workpiece swings back, it will generate a component force that causes the fixture to run along the transfer guide rail 32. The direction of this component force is towards the conveyor rail. When the current transfer guide rail 32 is disengaged from the contact wire due to lateral movement, the aforementioned reciprocating oscillation may cause the fixture to slip off the current transfer guide rail 32.

[0088] Since the non-continuous end of the transfer guide 32, i.e., the end furthest from the conveyor guide, can use a hard limit, meaning that this end can directly use a baffle welded to the transfer guide 32 without considering the issue of detachment from this end. The part that needs to be prevented from detaching is the continuation end, i.e., the end that connects to the conveyor guide. When the workpiece swings back, the fixture that last entered the transfer guide 32 is most likely to detach. It should be understood that detachment here refers to the situation where the transfer guide 32, currently connected to the conveyor guide, disengages from, for example, the upward guide 7, causing the fixture to lose power and the continuation end of the transfer guide 32 to lose its limit.

[0089] In view of this, an anti-detachment device is provided for the hanger to prevent it from slipping off the transfer rail 32 after it becomes detached from the transport rail.

[0090] As mentioned earlier, in some embodiments, the hanger itself is equipped with a braking device, which may be, for example, an electric lever. This electric lever is normally closed, meaning it opens when energized and locks when de-energized. Such a structure is common in the automotive field, such as in passenger cars, where the parking brake is engaged when the engine is off and the vehicle is in P gear.

[0091] In the mechanical field, normally open and normally closed mechanical structures are quite common, and the same is true for electrical equipment. Normally open and normally closed switches are also common configurations. Considering that the braking device needs to be in working condition when power is lost, the braking device should be in a normally closed state when power is lost and can be opened when power is restored. However, it should be known that it can also be opened by receiving an external command.

[0092] The configuration of the braking device in the above-mentioned harness assembly is referred to as the first type, which depends on the configuration of the harness itself. Alternatively, the braking itself can be, for example, locking the harness wheelset using static friction. Relatively speaking, locking using static friction has limited locking capability, but it is still an option.

[0093] In some implementations, a second form, referred to as an anti-detachment device, is provided on the side of the shuttle trolley, with the front shuttle trolley 15 and the rear shuttle trolley 1 adaptively provided accordingly.

[0094] The second form can be found in an example in the appendix to the instruction manual. Figure 6 and Figure 7 In the figure, the upper part of the transfer guide 32 is wider than the lower part. A vertical hole can be opened on the upper part to provide, for example, an electric stop pin. The stop pin seat is installed on the upper part of the transfer guide 32, and the stop pin body passes through the vertical hole. When the current transfer guide 32 is disengaged from the conveyor guide, the stop pin is lowered to form a limit stop pin. When the transfer guide 32 is reconnected to the conveyor guide, the stop pin is reset, so that the track surface of the transfer guide 32 is connected to the track surface of the conveyor guide.

[0095] In some embodiments, the anti-detachment device can also be configured on the main support side, including, for example, the front guide rail bracket 19, which can be understood as the upper part of the main support. It should be noted that the transfer rail 32 only needs to connect with the transport rail when it reaches the position of the transport rail. Therefore, a baffle is provided on, for example, the front guide rail bracket 19, with its rear end face, that is, the side opposite to, for example, the first transfer rail 16, in contact with the first transfer rail 16. Obviously, this contact is not strict, because the individual wheels of the hanger are not small, and the contact can be as small as possible without causing motion interference.

[0096] Furthermore, the distance between, for example, the rear end face of the baffle and, for example, the first ferry guide rail 16 is preferably smaller than the radius of the hanger wheel set, but should not be too small, so as not to cause motion interference.

[0097] The baffle serves as a limit and is called a limiting device. It is located at least between the ends of the upward guide rail 7 and the downward guide rail 11, and should also be provided on the outside of the conveying guide rail, so that the transfer guide rail 32 will extend beyond the inside of the conveying guide rail.

[0098] The baffle-type limiting device can be a steel component, such as a channel steel. The web of the channel steel acts as the aforementioned baffle. Steel has high rigidity and strong impact resistance.

[0099] For simple baffles, they can be reinforced, for example, by adding auxiliary supports.

[0100] Baffle-type limiting devices can also use, for example, a square tube construction, with one side panel of the square tube serving as the baffle.

[0101] In some embodiments, rods, such as steel pipes or steel bars, can also be used to limit movement. They only need to block the front side of, for example, the first ferry rail 16, so that the wheel set of, for example, the hanger cannot cross.

[0102] The extension range of the limiting device located outside the transport guide rail depends on the range of motion of all the transfer guide rails 32 on a transfer trolley. For example, when there are two transfer guide rails, see [reference needed]. Figure 1 As shown, the maximum value of the first transfer guide rail 16 moving to its side and the maximum value of the second transfer guide rail 17 moving to its side are the two extreme values ​​of the range of motion. These two extreme values ​​determine the extension range of the limiting device outside the transport guide rail.

[0103] When there are multiple transfer rails 32, the range of motion of the outer transfer rail 32 determines the extension range of the limiting device outside the transport rail.

[0104] In a preferred embodiment, the fixtures of the fixture group include an electric hoist, which can automatically retract and extend according to preset instructions to adapt to different process requirements.

[0105] Furthermore, the hanging device further includes:

[0106] The track wheel assembly, for cooperating with the corresponding guide rail, includes at least one drive wheel, wherein the guide rail obviously includes the ferry guide rail 32 and the transport guide rail.

[0107] Furthermore, the hanger is equipped with its own drive assembly. In the embodiments of the present invention, an electric drive assembly, such as an electric reducer, is used to drive the drive wheel.

[0108] In addition, the power for the aforementioned electric speed reducer is obtained from the power grid and pantograph in the overhead contact line.

[0109] As mentioned earlier, the start-stop control of the electric gear reducer can also come from the signal network and pantograph in the overhead contact line.

[0110] Since the connection between the fixture and the track is a wheel-rail pair, the positioning accuracy of this type of kinematic pair is relatively poor. To ensure accurate alignment between the shuttle guide rail 32 and the conveying guide rail, it is necessary to maintain good parallelism between the shuttle guide rail 32 and the conveying guide rail. Therefore, in this embodiment of the invention, an auxiliary positioning mechanism is also provided for auxiliary positioning after the front shuttle trolley 15 or the rear shuttle trolley 1 has been in place, thereby ensuring accurate connection of the track surfaces between the current shuttle guide rail 32 and the conveying guide rail, and avoiding jamming during fixture introduction and export.

[0111] In some embodiments, the auxiliary positioning mechanism includes:

[0112] The positioning component is mounted or formed on the frame 31 of the shuttle trolley and provides a positioning port parallel to the direction of the conveying guide rail.

[0113] A guide rod pair, constructed or installed on the main frame of the workpiece conveying device, moves parallel to the conveying guide rail. The guide rod 27 has a wedge-shaped or conical head to engage with the positioning port to form a wedge-shaped pair when the shuttle trolley deviates from its stopping position, thus guiding the guide rod 27 inwards. Because the head of the guide rod 27 is wedge-shaped or conical, even if the guide rod 27 and the positioning port are not perfectly aligned—for example, the wedge-shaped head engaging with the positioning port will generate a lateral component—it automatically aligns the guide rod 27 precisely with the positioning port. During the process of the guide rod 27 and the positioning port achieving shaft-hole engagement, the frame 31 is gradually aligned. Once the main body of the guide rod 27 and the positioning port achieve shaft-hole engagement, the clearance of the shaft-hole engagement is very small under guiding conditions, allowing the frame 31 to be accurately aligned, thereby creating a smoother connection between the shuttle guide rail 32 and the conveying guide rail.

[0114] Figure 3 and Figure 5 The figure provides a relatively clear embodiment. In the figure, a positioning plate 22 is installed on the frame 31. The positioning plate 22 includes a seat plate for fixed connection with the frame 31. The seat plate is a horizontal plate in the figure. Then, a vertical plate is set on the seat plate. The vertical plate has a guide hole. The guide hole can be directly used as the positioning port, but it is easy to form dry friction and the smoothness is relatively poor.

[0115] The guide hole can be fitted with, for example, a bronze bushing to provide a friction surface with a relatively low coefficient of friction.

[0116] In addition, a linear bearing 23 can be installed inside the guide hole to change sliding friction into rolling friction, which is beneficial for the intervention of the guide rod 27.

[0117] Figure 3 In the middle, guide rod 27 is pre-installed on the main frame via a pair of supports, such as Figure 3The pair of linear bearings 28 shown constitute a linear bearing assembly. The head end of the guide rod 27 is, for example, a tapered head, and the other end, i.e. the tail end, is connected to a cylinder 30 or a hydraulic cylinder to realize the operation of the guide rod 27.

[0118] The positioning achieved by using the cooperation between the guide rod 27 and, for example, the guide hole can only be adjusted within a small range. This small range requires that the movement of the shuttle trolley itself is already well controlled. Therefore, for example, the motor 24 can be a servo motor to achieve more precise drive control.

[0119] In some embodiments, a detection device for detecting the lateral movement of the shuttle trolley is provided on the main frame of the workpiece conveying device to control the braking of the shuttle trolley. For example, a grating ruler is provided on the front guide rail bracket 19. After the grating ruler detects that the front shuttle trolley 15 has moved a given distance, the motor 24 starts to brake. Since its braking distance is approximately fixed, even if there is a braking error, it is still within the range that is corrected by, for example, the guide rod 27 and the guide hole.

[0120] The detection device can also be, for example, a proximity switch or a limit switch. For example, a limit switch is installed on the front shuttle trolley 15. After the limit switch moves to a specified position, it moves the arm of the limit switch to send out a switching signal, thereby causing the motor 25 to start braking.

[0121] Other detection devices are similar, such as through-beam photoelectric sensors, etc.

[0122] To further ensure the accuracy of alignment between the transfer guide rail 32 and the conveying guide rail, see... Figure 8 and Figure 9 Firstly, the shuttle guide rail 32 is located on the lower side of the frame 31 of the shuttle trolley, leaving the upper side of the frame 31 empty. The corresponding transverse guide rail of the shuttle trolley is located on the lower side of the frame 31.

[0123] For example, both the front transverse guide rail 20 and the rear transverse guide rail 6 include two track components, which have a certain degree of alignment, even when using a wheel-rail pair, which has low precision.

[0124] Furthermore, a secondary track assembly is provided between the two track components. This secondary track assembly is located above the corresponding front shuttle trolley 15 and rear shuttle trolley 1 to provide auxiliary guidance for the front shuttle trolley 15 and rear shuttle trolley 1. In this way, the shuttle trolleys are guided simultaneously on both the upper and lower sides, which easily achieves better alignment, thereby maintaining good parallelism between the shuttle guide rail 32 and the transport guide rail.

[0125] Figure 8 In the middle, the upper part of the main support also includes a support section located above the shuttle trolley, which is arranged in the form of a gantry structure.Figure 8 A hanging vertical bar 40 is installed on the longitudinal beam 37. A raceway 41 is installed at the lower end of the vertical bar 40. The raceway is a square tube, and raceway surfaces are provided on the front and rear sides of the square tube raceway.

[0126] On the frame 31 of the swing trolley, a guide wheel shaft is provided upwards, and a guide wheel 33 is mounted on the guide wheel shaft. The guide wheel 33 mates with the raceway surface to form a guide. The guide wheel 33 is arranged in a front-to-back opposing manner to mate with the raceway 41, and as... Figure 5 As shown, there are two raceways 41, which provides good straightness, and the guide wheels 33 are equipped with four sets, with two sets for each raceway 41, thus forming good guidance.

[0127] Figure 8 In the middle, the plumb rod 40 is also provided with a value of 38 to give the plumb rod 40 better static stiffness.

Claims

1. A workpiece conveying device for use in conveying workpieces on a shot blasting line, characterized in that, The workpiece conveying device comprises: a conveying rail comprising an upper rail and a lower rail arranged in parallel; a front transverse rail located at the head end of the conveying rail; a front transfer trolley running on the front transverse rail; a front transfer rail mounted on the front transfer trolley for changing the connection position with the upper rail or the lower rail through the movement of the front transfer trolley; a rear transverse rail located at the tail end of the conveying rail; a rear transfer trolley running on the rear transverse rail; a rear transfer rail mounted on the rear transfer trolley for changing the connection position with the upper rail or the lower rail through the movement of the rear transfer trolley; a hanger group running on the conveying rail and the front and rear transfer rails for hanging the workpiece; the front and rear transfer rails are each provided with at least two rails for sequentially carrying the hangers, and the transfer trolley is configured as a workpiece buffer; the front transfer rail is located on the lower side of the front transfer trolley; the rear transfer rail is located on the lower side of the rear transfer trolley; the front and rear transverse rails each comprise two rail members; a sub-rail pair is provided between the two rail members and located on the upper side of the corresponding front and rear transfer trolleys to provide auxiliary guidance for the front and rear transfer trolleys.

2. The workpiece transport apparatus of claim 1, wherein, A catenary is arranged along the conveying rail; correspondingly, the hanger group has a pantograph matched with the catenary.

3. The workpiece transport apparatus of claim 1 or 2, wherein, A detachment prevention device is provided, which has: a first form, a braking device arranged on the hanger group; or a second form, a locking device arranged on the front and rear transfer trolleys for locking the hanger group; or a third form, a limiting device located on the workpiece conveying device, which is located between the end portions and the outer side of the upper and lower rails and is higher than the rail surface of the conveying rail.

4. The workpiece transport apparatus of claim 1, wherein, The hangers of the hanger group comprise electric hoists, and the hangers further comprise: a rail wheel group for cooperating with the corresponding rail, at least including a drive wheel; a drive assembly for driving the drive wheel.

5. The workpiece transport apparatus of claim 1, wherein, An auxiliary positioning mechanism is provided for auxiliary positioning after the front or rear transfer trolley is transferred into position.

6. The workpiece transport apparatus of claim 5, wherein, The auxiliary positioning mechanism comprises: a positioning component mounted or formed on the frame of the transfer trolley, providing a positioning port parallel to the direction of the conveying rail; a guide rod pair constructed or mounted on the main frame of the workpiece conveying device, and the movement direction of the guide rod pair is parallel to the conveying rail, and the head of the guide rod is a wedge-shaped or conical head to be guided into the wedge-shaped pair when the transfer trolley is parked with a deviation.

7. The workpiece transport apparatus of claim 5 or 6, wherein, A detection device is provided on the main frame of the workpiece conveying device for detecting the lateral movement of the transfer trolley to control the braking of the transfer trolley.

8. A shot blasting line, characterized in that The workpiece conveying device of any one of claims 1-7 is provided for transferring the workpiece between stations.

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