Cascading shot blasting machine

Abstract

The invention discloses a kind of catenary shot blasting machine, comprising: shot blasting chamber;Catenary line is arranged above shot blasting chamber;Load carriage is installed on catenary line;Empty load carriage is installed on catenary line, and is separated from adjacent load carriage by a predetermined distance;The empty load carriage is separated from shot blasting chamber during operation;Hook assembly is installed in the lower end of load carriage, to hang workpiece and in the shot blasting chamber travel section of catenary line intervention into shot blasting chamber;And in-place detection device is set on the top of shot blasting chamber or the rack of catenary line, to detect whether corresponding empty load carriage is in place.The catenary shot blasting machine according to the invention has relatively high operating efficiency.

Description

Technical Field

[0001] This invention relates to a overhead catenary shot blasting machine. Background Technology

[0002] Overhead shot blasting machines are widely used in the foundry and metal processing industries, such as in the steel industry for rust removal, oxide scale removal, and surface roughness improvement of steel plates, pipes, and sections. In the foundry industry, overhead shot blasting machines are mainly used to clean the surfaces of cast workpieces, molds, stamped parts, and welded workpieces to improve their surface quality. Because current overhead shot blasting machines generally employ automated control, before shot blasting, the equipment needs to know if the workpiece has reached the preset position outside the blasting chamber. If it has, the gate of the blasting chamber opens, allowing the workpiece to enter. Once the gate closes and the workpiece reaches the designated position, the shot blaster starts, performing the shot blasting treatment.

[0003] Current overhead conveyor shot blasting machines generally employ stepper control, typically using the drive unit itself to control the conveyor's movement. This drive unit controls the amount of movement of the conveyor with a programmed method, and is also equipped with a rotary encoder to detect the rotation of the drive unit's output shaft in real time. This closed-loop feedback allows for precise control of the conveyor's movement with each step. This control method is one of the most common in the mechanical field and has relatively widespread applications. However, this method also has a problem: although the number of pulses generated by the rotary encoder is positively correlated with the amount of rotation, achieving precise control solely based on this is still difficult. This is because the rotary encoder is highly susceptible to external environmental influences, especially electromagnetic interference, and its measurement error can be significant during continuous conveyor drive.

[0004] In the mechanical field, it is generally necessary to adapt other components to assist optical measurement equipment such as rotary encoders, such as limit switches, or other components, and even mechanical limit switches, so as to form soft control based on the data sampled by the rotary encoder and hard control with the help of limit switches or even mechanical limit switches, so as to ensure the reliability of mechanical equipment operation.

[0005] However, in the field of overhead conveyor shot blasting technology, the focus is still on controlling the overhead conveyor on the drive device side. There is a lack of a device to assist the hook assembly on the overhead conveyor shot blaster in stopping. This makes it relatively difficult to control the workpiece lifted by the hook assembly to the predetermined position outside the gate and to the predetermined work position in the shot blasting chamber. It may even require manual assistance to avoid, for example, the workpiece hitting the gate, thus affecting the overall shot blasting efficiency. Summary of the Invention

[0006] The purpose of this invention is to provide a overhead conveyor shot blasting machine with relatively high operating efficiency.

[0007] In an embodiment of the present invention, a catenary shot blasting machine is provided, comprising: Shot blasting room; The catenary is positioned above the shot blasting chamber; Load-bearing carriage, mounted on a catenary; An unloaded carriage is installed on a catenary and is separated from the adjacent loaded carriage by a predetermined distance; the unloaded carriage is detached from the shot blasting chamber during operation; A hook assembly, installed at the lower end of the load carriage, is used to suspend the workpiece and intervenes in the shot blasting chamber during the shot blasting chamber stroke of the catenary; and The positioning detection device is installed on the top of the shot blasting chamber or on the frame of the overhead conveyor to detect whether the corresponding unloaded carriage is in position.

[0008] Optionally, the positioning detection device may be provided in one or two sets.

[0009] Optionally, when there are two sets of arrival detection devices, the two sets of arrival detection devices are set on the same side of the traveling track included by the catenary, or one set is set on one side of the traveling track and the other set is set on the other side of the traveling track. When two sets of positioning detection devices are set on the same side of the travel track, one object to be identified is fitted on the unloaded carriage; when two sets of positioning detection devices are set on both sides of the travel track, two objects to be identified are set on the unloaded carriage, so that they correspond one-to-one with the positioning detection devices.

[0010] Optionally, when the two sets of arrival detection devices are set on the same side of the travel track, the distance between the two corresponding workstations is greater than 300mm; When two sets of positioning detection devices are set on opposite sides of the travel track, the distance between the two stations shall not exceed 300mm.

[0011] Optionally, each set of positioning detection devices is equipped with a pair of detection elements, and the two detection elements are connected in parallel for output.

[0012] Optionally, the positioning detection device is mounted on a frame, which is fixedly mounted on the catenary's travel guide rail.

[0013] Optionally, the positioning detection device is fixed to the travel track in the following way: The first fixing method is to fix the bracket to the travel track by using fasteners in conjunction with the base holes opened on the travel track; The second fixing method involves fixing the seat frame to the travel track using upper and lower clamping plates and fasteners; wherein the seat frame includes a seat plate forming the upper clamping plate and located above the fishtail beam of the travel track, and lower clamping plates adapted to be located on both sides of the web of the travel track on the lower side of the fishtail beam; or The third fixing method uses magnets to connect the seat frame and the fishtail beam of the travel track.

[0014] Optionally, the frame includes: Seat plate, used for connection between seat frame and travel guide rail; An L-shaped rod or plate is fixedly connected to a seat plate. The L-shaped rod or plate includes an overhanging portion and a lower extension portion. The overhanging portion is used to maintain a first distance between the lower extension portion and the travel track. The lower extension portion is used to adapt to the height of the object to be identified on the unloaded carriage.

[0015] Optionally, there are two L-shaped rods or plates, which are parallel to each other and maintain a second distance. A mounting plate is provided between two L-shaped rods or plates for mounting the positioning detection device.

[0016] Optionally, the unloaded carriage extends downward to have a lower suspension; the lower end of the lower suspension extends laterally and is provided with an identifiable object; The positioning detection device is a limit switch, proximity switch, or photoelectric sensor.

[0017] According to embodiments of the present invention, the overhead conveyor shot blasting machine is equipped with two types of carriages on the overhead conveyor: a conventional carriage, which is referred to as a load carriage for distinction; and a carriage unique to embodiments of the present invention, which does not carry a workpiece and is considered an unloaded carriage in contrast to the load carriage. The unloaded carriage, serving as the object being inspected or as its carrier, exhibits good operational stability and a relatively low probability of false detection due to its lack of load. Furthermore, the unloaded carriage is located outside the shot blasting chamber and is detached from it, meaning there is no physical contact. Under these conditions, instability caused by motion interference can be minimized. Correspondingly, a positioning detection device is provided on the top of the shot blasting chamber or on the frame of the overhead conveyor to detect whether the corresponding unloaded carriage is in position. With a specially configured positioning detection device and a suitable unloaded carriage, the positioning detection can better adapt to the control of the shot blasting chamber gate and the shot blaster, reducing personnel intervention and thus achieving relatively good work efficiency. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the main structure of a overhead catenary shot blasting machine in one embodiment.

[0019] Figure 2 This is a top view of a overhead conveyor shot blasting machine in one embodiment.

[0020] Figure 3 This is a schematic diagram of the left side of a catenary shot blasting machine in one embodiment.

[0021] Figure 4This is a front view schematic diagram of the installation structure of the positioning detection device on the travel track in one embodiment. The unloaded carriage and the object to be identified are shown on the left.

[0022] Figure 5 This is a three-dimensional schematic diagram of the installation structure of the positioning detection device on the walking track in one embodiment.

[0023] Figure 6 This is a left view of the installation state of the connecting plate on the travel track in one embodiment.

[0024] Figure 7 This is a schematic diagram of the assembly structure of the identified object on an unloaded carriage in one embodiment.

[0025] Figure 8 This is a top view schematic diagram of the configuration of two sets of positioning detection devices on the travel track in one embodiment.

[0026] In the diagram: 1. Bracket, 2. Chain, 3. Traveling track, 4. Shot blasting chamber, 5. Position detection device, 6. Loaded carriage, 7. Unloaded carriage, 8. Hook assembly, 9. Upper unloading area, 10. Workpiece, 11. Tensioning trolley, 12. Tensioning roller assembly, 13. Tensioning track, 14. Drive device, 15. Identified object, 16. Lower suspension, 17. Lower clamping plate, 18. Upper clamping plate, 19. Connecting plate, 20. First detection element, 21. Second detection device, 22. Mounting plate, 23. Nut, 24. Elastic washer, 25. Flat washer, 26. Bolt, 27. Connecting hole, 28. First side position detection device, 29. Second side position detection device, 30. Second side identified object, 31. First side identified object. Detailed Implementation

[0027] It should be known that overhead conveyor shot blasting machines generally use a ring chain. Figure 2 The structure shown is quite clear, and the chain is generally a unidirectional chain, meaning it rotates either counterclockwise or clockwise. Except for the arc segments at both ends, the main body generally consists of two parallel chain edges, with the shot blasting chamber 4 typically located directly below one of these chain edges.

[0028] A catenary, in this context, refers to a series of carriages mounted on a circular track. In traditional catenary shot blasting machines, these carriages are used to load workpieces and are therefore called load carriages 6. In contrast, in the embodiments of this invention, there is another type of carriage that is not used to load workpieces and is called an unloaded carriage 7.

[0029] In this field, there is a defined top and bottom, such as shot blasting chamber 4, where the "top" of the shot blasting chamber is defined by the top position. Based on the direction of the chain's movement, the front-back and left-right directions can be determined. That is, the direction of movement is front, and the opposite is back. In the reference plane, the direction perpendicular to front and back is left and right. The left and right directions are also called the transverse or width direction, and the front-back direction is also called the longitudinal or length direction.

[0030] The top of the shot blasting chamber 4 has an opening extending in the front-to-back direction for the hook assembly 8, which is suspended from the load carriage 6, to enter the shot blasting chamber 4. The opening is equipped with a sealing device. This is only a brief description. It should be understood that in the embodiments of the present invention, the focus is on introducing an unloaded carriage 7 and a suitable positioning detection device. The remaining parts can adopt conventional configurations in the art, and other configurations unrelated to this will not be described in detail.

[0031] The shot blasting chamber 4 has front and rear gates. The timing of the gate opening will have a certain impact on the shot blasting efficiency. If the gate opening is delayed, the workpiece 10 may hit the gate. If the gate is opened too early, the working time will be lost because opening the gate too early means that the previous shot blasting needs to be terminated in advance, making it difficult to make precise use of the time slice.

[0032] After that, the shot blasting machine is started after the workpiece 10 is in place. Although each shot blasting takes ten to several tens of minutes, the precise use of time slices still needs to be considered from the time the workpiece 10 is in place until the shot blasting machine starts.

[0033] Furthermore, the stopping position of workpiece 10 also significantly affects the shot blasting effect. Since the shot blasting angle is often fixed, the position of workpiece 10 affects the comprehensiveness of the shot blasting and the utilization rate of the shot. The example specifically mentioned below, equipped with two sets of positioning detection devices, illustrates this point. Some workpieces 10 may have blind spots when shot blasted at only one station, requiring a second shot blasting at another station. This also reflects the impact of the workpiece 10's stopping position accuracy on the shot blasting effect.

[0034] A catenary is installed above the shot blasting chamber 4. The catenary includes a circular running track 3 and a circular chain 2 arranged parallel to the running track 3 in the vertical direction. The running track 3 is used for the operation of the carriage and bears the load. The chain 2 is connected to the carriage and is used to pull the carriage to run on the running track 3.

[0035] Traditional slides are the load slides 6 shown in this embodiment of the invention, i.e., slides used to load workpieces 10. The lower end of the load slide 6 is generally connected to a hook assembly or other components or devices for hanging workpieces 10. The downward extension length of the hook assembly should be sufficient to allow it to enter the shot blasting chamber 4 from outside the chamber. The part used to cooperate with the opening provided at the top of the shot blasting chamber 4 is generally a lifting rod.

[0036] It should be noted that although it is called a carriage, the actual cooperation between the carriage and the traveling track 3 is often a rolling cooperation. That is, the carriage is generally equipped with one or two pairs of track wheels, while the traveling track is generally an I-beam track. The two track wheels in each pair are usually symmetrically arranged about the web of the I-beam track to improve the stability of the travel.

[0037] Because the workpiece 10 is transported into the shot blasting chamber 4 by suspension, and lacks other supports or connections for the workpiece 10, it will sway due to inertia when the catenary stops moving. Since the objects being shot blasted are mostly metal parts with very large weight or inertia, they are often difficult to stabilize in a short time.

[0038] In contrast, the unloaded carriage 7, when stopped, has a relatively small weight of itself and the overall weight of the loaded components, and can quickly stabilize, which is conducive to the system making a relatively accurate judgment.

[0039] Accordingly, both the unloaded carriage 7 and the loaded carriage 6 are installed on the catenary, and each catenary is equipped with multiple loaded carriages 6. Considering the number of positioning detection devices, positioning detection devices can be set at a given location, either one or two, or at most three, locations, instead of being one-to-one with the unloaded carriage 7, thus reducing the number of positioning detection devices required.

[0040] The unloaded carriage 7 and the loaded carriage 6 are used together. This use can be a one-to-one use or a one-to-two use. Preferably, one unloaded carriage 7 is adapted to one loaded carriage 6.

[0041] Regarding the positional relationship, it should be known that, based on a definite positional relationship, for example, if the center distance between an unloaded slide 7 and the load slide 6 that cooperates with the unloaded slide 7 is 100mm, then when the load slide 6 is in position, the center distance between the current unloaded slide 7 and the load slide 6 corresponding to the current unloaded slide 7 must be 100mm. Therefore, as a design basis, a positioning detection device for detecting whether the unloaded slide 7 is in position can be set at the corresponding position to determine whether the load slide 6 is in position.

[0042] Since the unloaded carriage 7 is not under load (relative to the loaded carriage 6), it is easier to identify accurately. Based on the determined positional relationship, under the condition that the unloaded carriage 7 and the loaded carriage 6 maintain a set distance, when the position of the unloaded carriage 7 is determined, the position of the loaded carriage 6 that is used in conjunction with the unloaded carriage 7 is also determined.

[0043] By combining the detection of the unloaded carriage 7 in place, a more reliable basis can be provided for the working timing of things such as gates and shot blasters, and the overall time slices can be set more precisely, resulting in higher overall shot blasting efficiency.

[0044] Given the different types and sizes of workpieces 10, although a shot blasting chamber 4 is equipped with at least one shot blaster, and multiple shot blasters are a conventional configuration, under these conditions, the cooperation of multiple shot blasters can often achieve relatively comprehensive shot blasting of the workpiece. In particular, the lower part of the load carriage 6 configured on the current catenary can rotate, meaning that during the shot blasting process, the workpiece 10 also rotates, allowing the workpiece 10 to receive relatively comprehensive shot blasting.

[0045] However, due to factors such as the accuracy of the docking position and the varying complexity of the workpiece 10's outline, shot blasting at a single station may inevitably result in shot blasting dead zones for some types of workpieces 10. These dead zones may become exposed after the position is changed. Therefore, in embodiments of the present invention, two or three shot blasting stations are set in the shot blasting chamber to accommodate the varying complexity of the workpiece 10's outline. The user can choose to shot blast the workpiece 10 at one or two stations according to its characteristics.

[0046] Under these conditions, the adapted positioning detection device can be set to a number of groups consistent with the number of workstations.

[0047] However, it should also be understood that, as mentioned above, since the unloaded slide 7 and the loaded slide 6 are adapted to each other, in some embodiments, even if there are multiple shot blasting stations, there can still be only one set of arrival detection device. Under this condition, the many-to-one cooperation relationship between the unloaded slide 7 and the loaded slide 6 is used to determine the multiple stations.

[0048] With a one-to-one cooperation between the unloaded carriage 7 and the loaded carriage 6, multiple arrival detection devices can be equipped to adapt to multiple workstations.

[0049] In some embodiments, for example, the positioning detection device is detachably connected to the top of the shot blasting chamber or the frame of the overhead conveyor, and different numbers of positioning detection devices are adapted depending on the workpiece.

[0050] It should be understood that some users have relatively simple workpieces, while others have a relatively diverse range of workpiece types. For the former, a fixed-configuration overhead conveyor shot blasting machine offers better performance, representing a streamlined configuration. For the latter, it is necessary to consider adaptability to different types of workpieces, and the overhead conveyor shot blasting machine preferably possesses adaptive adjustment capabilities. Therefore, in the embodiments of the present invention, a streamlined rather than universal configuration can be provided specifically for users with relatively simple workpiece types, while for users with relatively diverse workpiece types, an overhead conveyor shot blasting machine can be provided with optional components or elements that can be selected according to the workpiece type, giving greater consideration to versatility. Therefore, for the latter, some optional components, such as positioning detection devices, are preferably assembled with, for example, the traveling track 3 using a detachable connection.

[0051] Regarding the shot blaster, the projectile stream increases with the launch distance, and the dispersion of the projectiles also increases. In other words, the projectile stream is generally conical. Obviously, the small end of the conical projectile stream is located on the shot blaster side. Under these conditions, the impact surface of the workpiece 10 will change due to the change in the position of the workpiece 10, and will not be significantly improved by the rotation of the workpiece 10 itself. This change is often quite drastic. Therefore, when it is necessary to change the workstation to perform shot blasting, it is often not necessary for the workpiece 10 to move too far.

[0052] Therefore, when there are two sets of positioning detection devices, one set is set on one side of the travel track 3 and the other set is set on the other side of the travel track 3. This can avoid positional interference between the two sets of positioning detection devices when the two shot blasting stations are relatively close to each other.

[0053] In other words, if the aforementioned positional interference is resolved, then the two sets of position detection devices can also be set on the same side of the traveling track 3 included in the catenary.

[0054] When the two sets of positioning detection devices are set on the same side of the travel track 3, one object to be identified 15 is adapted on the unloaded carriage 7; when the two sets of positioning detection devices are set on both sides of the travel track 3, two objects to be identified 15 are provided on the unloaded carriage, so that they correspond one-to-one with the positioning detection devices.

[0055] Obviously, when there are two objects to be identified 15, the two objects to be identified 15 are located on both sides of the unloaded carriage 7 on which they are installed.

[0056] As a reference design value, when the two sets of position detection devices are set on the same side of the travel track 3, the distance between the two corresponding workstations is greater than 300mm; while when the two sets of position detection devices are set on opposite sides of the travel track 3, the distance between the two workstations is no greater than 300mm.

[0057] Due to the harsh working environment, in order to reduce the false detection rate or the inability to accurately identify when a single positioning detection device malfunctions, each group of positioning detection devices is equipped with a pair of detection elements, and the two detection elements are connected in parallel for output. That is, as long as one of the positioning detection devices in the same group detects that the empty carriage 7 is in position, it is sufficient, even if one of them is damaged or cannot be correctly identified.

[0058] The travel track 3 is accompanied by the chain 2, and the unloaded hanger 7 and the loaded hanger 6 run on the travel track 3 under the drive of the chain 2. Therefore, the travel track 3 is a preferred choice for installing the positioning detection device. Thus, in a preferred embodiment, the positioning detection device is mounted on a frame, which is fixedly mounted on the travel guide track 3 of the catenary.

[0059] As mentioned above, the positioning detection device is preferably installed on the travel track 3 in a detachable connection manner, so as to facilitate the adjustment of the position of the positioning detection device according to the different types of workpieces 10. Therefore, there are three main types of relatively good fixing methods between the positioning detection device and the travel track, which will be described one by one below.

[0060] The first fixing method is to fix the frame to the travel track 3 by using fasteners in conjunction with the base holes opened on the travel track 3. Considering the removability, the fasteners should be bolted or screwed, with corresponding fastening bolts or screws used for fixing.

[0061] Drilling holes in the traveling track 3 will weaken its strength to some extent. Therefore, a non-drilling method is a better choice. As mentioned earlier, most overhead conveyor shot blasting machines currently use I-beam guide rails. The upper part of the I-beam guide rail is a fishtail beam, and the lower part is a track plate. The two are parallel to each other, and the middle is a web plate. That is, the fishtail beam and the track plate are connected by the web plate. In some implementations, the web plate is also included in the fishtail beam, hence the name "fishtail beam".

[0062] The fishtail beam is similar in shape to the track slab. It also has a strip on each side of the web plate. The presence of this strip allows for the installation of other components, including the installation of track bolts. The track bolts are pressed onto the fishtail beam by pressure plates to install the traveling track 3.

[0063] Furthermore, a second fixing method is provided, in which the seat frame is fixed to the travel track by upper and lower clamping plates and fasteners, the clamped parts being the plate strips; wherein, the seat frame includes a seat plate constituting the upper clamping plate 18 located on the upper side of the fishtail beam of the travel track 3, and lower clamping plates 17 adapted on the lower side of the fishtail beam 3, located on both sides of the web of the travel track 3; from Figure 6It can be clearly distinguished that each upper clamping plate 18 is paired with a pair of lower clamping plates 17. Clamping holes are aligned on both the upper clamping plate 18 and the lower clamping plate 17. Then, using... Figure 6 The bolt 26 shown, together with the nut 23, secures the seat frame to the travel track 3. With this method of fixing, it is not necessary to remove the bolt 26 when adjusting the position of the seat frame; simply loosen the nut 23, slide the seat frame to adjust its position, and then tighten the nut 23 after it is in place.

[0064] In some implementations, a third fixing method can be used, which completely omits fasteners and uses only magnetic attraction to fix the frame to the fishtail beam of the travel track 3. It should be understood that, as Figure 5 As shown, the load on the bracket is very small, and the required fixation reliability can still be met by using magnets to fix the bracket.

[0065] See Figure 6 As shown in the figure, the frame includes: The seat plate, consisting of the upper clamping plate 18, is used for the connection between the seat frame and the travel guide rail 3. The L-shaped connecting plate can also be replaced by an L-shaped rod, referred to as an L-shaped rod. The L-shaped connecting plate or L-shaped rod is fixedly connected to the seat plate. The L-shaped rod or plate includes a cantilever portion and a lower extension portion. The cantilever portion is used to leave a first distance between the lower extension portion and the travel track 3. The lower extension portion is used to adapt to the height of the object to be identified on the unloaded carriage 7.

[0066] As shown in Figure 5, there are two L-shaped rods or plates, which are parallel to each other and maintain a second distance. A mounting plate 22 is provided between two L-shaped rods or plates for mounting the positioning detection device.

[0067] exist Figure 4 and Figure 7 As can be seen, the unloaded carriage 7 extends downward to have a lower suspension 16; the lower suspension 16 is mainly used to avoid motion interference, and furthermore, the lower end of the lower suspension 16 extends laterally to provide an identifiable object 15.

[0068] The positioning detection device is a limit switch, proximity switch, or photoelectric sensor.

[0069] The identified object 15 is related to the selected position detection device. If the position detection device is a limit switch, then the identified object 15 can be a rigid part, and the material can be iron, other metals, or engineering plastics.

[0070] If the arrival detection device uses a proximity switch, then the object to be identified 15 can only be made of ferromagnetic material.

[0071] If the positioning detection device uses a photoelectric sensor, the object to be identified 15 can be mainly considered in terms of shape and opaque material, such as an opaque plastic sheet.

Claims

1. A overhead conveyor shot blasting machine, characterized in that, include: Shot blasting room; The catenary is positioned above the shot blasting chamber; Load-bearing carriage, mounted on a catenary; An unloaded carriage is installed on a catenary and is separated from the adjacent loaded carriage by a predetermined distance; the unloaded carriage is detached from the shot blasting chamber during operation; The hook assembly is installed at the lower end of the load carriage to suspend the workpiece and enter the shot blasting chamber during the shot blasting chamber stroke of the catenary. as well as The positioning detection device is installed on the top of the shot blasting chamber or on the frame of the overhead conveyor to detect whether the corresponding unloaded carriage is in position. The positioning detection device is provided in one or two sets; each set of positioning detection devices is provided with a pair of detection elements, and the two detection elements are connected in parallel for output. The unloaded carriage extends downward to have a lower suspension; the lower end of the lower suspension extends laterally and is provided with an identification object; correspondingly, the unloaded carriage is provided with two identification objects to correspond one-to-one with the positioning detection device. The positioning detection device is a limit switch, proximity switch, or photoelectric sensor.

2. The overhead conveyor shot blasting machine according to claim 1, characterized in that, When there are two sets of arrival detection devices, the two sets of arrival detection devices are set on the same side of the traveling track included by the catenary, or one set is set on one side of the traveling track and the other set is set on the other side of the traveling track. When two sets of positioning detection devices are set on the same side of the travel track, an object to be identified is fitted on the unloaded carriage.

3. The overhead conveyor shot blasting machine according to claim 2, characterized in that, When two sets of positioning detection devices are set on the same side of the travel track, the distance between the two corresponding workstations is greater than 300mm; When two sets of positioning detection devices are set on opposite sides of the travel track, the distance between the two stations shall not exceed 300mm.

4. The overhead conveyor shot blasting machine according to claim 1, characterized in that, The positioning detection device is mounted on a frame, which is fixedly installed on the catenary's travel guide rail.

5. The overhead conveyor shot blasting machine according to claim 4, characterized in that, The method by which the positioning detection device is fixed to the traveling track is as follows: The first fixing method is to fix the bracket to the travel track by using fasteners in conjunction with the base holes opened on the travel track; The second fixing method involves fixing the seat frame to the travel track using upper and lower clamping plates and fasteners; wherein the seat frame includes a seat plate forming the upper clamping plate and located above the fishtail beam of the travel track, and lower clamping plates adapted to be located on both sides of the web of the travel track on the lower side of the fishtail beam; or The third fixing method uses magnets to connect the seat frame and the fishtail beam of the travel track.

6. The overhead conveyor shot blasting machine according to claim 4, characterized in that, The frame includes: Seat plate, used for connection between seat frame and travel guide rail; An L-shaped rod or plate is fixedly connected to a seat plate. The L-shaped rod or plate includes an overhanging portion and a lower extension portion. The overhanging portion is used to maintain a first distance between the lower extension portion and the travel track. The lower extension portion is used to adapt to the height of the object to be identified on the unloaded carriage.

7. The overhead conveyor shot blasting machine according to claim 6, characterized in that, The L-shaped rod or plate is two in number, and the two L-shaped rods or plates are parallel to each other and maintain a second distance; A mounting plate is provided between two L-shaped rods or plates for mounting the positioning detection device.

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