Induction brazing method, induction brazing device and induction brazing system

Abstract

The invention discloses an induction brazing method, an induction brazing device and an induction brazing system. The induction brazing method comprises the following steps that a plurality of connecting pipes of a workpiece to be welded make contact to form a plurality of joints; moving equipment is adopted to drive the induction brazing device to move to the multiple joints; and a plurality of joints are brazed at a time by adopting an induction brazing device. According to the technical scheme, automatic welding can be achieved.

Description

Technical Field

[0001] The invention relates to the technical field of brazing processing, and in particular to an induction brazing method, an induction brazing device and an induction brazing system. Background Art

[0002] During the welding process of the four-way valve and the pipeline, due to the complex structure of the four-way valve, welding equipment is generally used for welding at multiple joints, which has low welding efficiency and is difficult to achieve automated welding based on complex welding scenarios. Summary of the invention

[0003] The main purpose of the invention is to provide an induction brazing method, aiming to achieve automated welding.

[0004] To achieve the above object, the present invention provides an induction brazing method, comprising the following steps:

[0005] contacting a plurality of nozzles of the workpieces to be welded to form a plurality of joints;

[0006] Using a mobile device to drive the induction brazing device to move to a plurality of the joints;

[0007] An induction brazing device is used to braze a plurality of the joints at one time.

[0008] In one embodiment of the present invention, the plurality of joints include at least two first joints and one second joint, the at least two first joints are arranged side by side and located in a first joint area, the second joint is located in a second joint area, and the first joint area is separated from the second joint area;

[0009] The first joint and the second joint are brazed at one time using the induction brazing device.

[0010] In one embodiment of the present invention, the induction brazing device comprises at least two induction coil assemblies and a driving assembly for driving at least one of the induction coil assemblies to move;

[0011] Wherein, the driving assembly drives the induction coil assembly to move to an open state, and a mobile device is used to drive the induction brazing device to move to a plurality of the joints;

[0012] The driving component drives the induction coil component to move to a mating state, so that the two induction coil components enclose a processing space, and the processing space envelopes the first joint area and the second joint area. A high-frequency device is used to power the two induction coil components, so that the high-frequency device and the two induction coil components form a conductive loop, so as to perform a one-time brazing operation on the first joint and the second joint.

[0013] In one embodiment of the present invention, a heating device is used to heat the plurality of joints, and at the same time, the driving component drives the induction coil component to move to an open state.

[0014] In one embodiment of the present invention, after the step of “contacting a plurality of nozzles of the workpieces to be welded to form a plurality of joints”, the step further includes:

[0015] The workpiece to be welded is placed on a positioning fixture.

[0016] In one embodiment of the present invention, at least two workpieces to be welded are placed on at least two of the positioning fixtures respectively;

[0017] The mobile device is used to drive the induction brazing device to move to any of the positioning fixtures, so that the induction brazing device can braze multiple joints of any of the workpieces to be welded at one time.

[0018] The present invention also provides an induction brazing device applied to the induction brazing method as described above, the induction brazing device comprising:

[0019] Two induction coil assemblies, both used to be electrically connected to the high-frequency device, so that the two induction coil assemblies and the high-frequency device form a conductive loop;

[0020] A driving assembly, which is in driving connection with at least one of the induction coil assemblies, and the driving assembly drives at least one of the induction coil assemblies to move, so that the two induction coil assemblies have an open state and a mating state;

[0021] In the open state, the two induction coil assemblies are away from each other;

[0022] In the mating state, the two induction coil assemblies are close to each other to form a processing space, and the processing space can accommodate multiple joints of the workpieces to be welded at one time.

[0023] In one embodiment of the present invention, the induction coil assembly comprises:

[0024] The heating coil segment is provided with a first processing groove and a second processing groove arranged at intervals; in the matching state, the two first processing grooves constitute a first processing space, the two second processing grooves constitute a second processing space, and the first processing space and the second processing space constitute the processing space;

[0025] a first connecting section, one end of which is connected to the heating coil section, and the other end of which is used to be electrically connected to the high-frequency device;

[0026] A second connecting section, one end of the second connecting section is connected to an end of the heating coil section away from the first connecting section, and the ends of the two second connecting sections away from the heating coil section are electrically connected to each other.

[0027] In one embodiment of the present invention, the first connecting section comprises:

[0028] a first section, one end of which is connected to the heating coil section, and the first section is located below the heating coil section;

[0029] A flexible segment, one end of which is connected to an end of the first segment away from the heating coil segment;

[0030] The second section has one end connected to one end of the flexible section away from the first section, and the other end of the second section is used for being electrically connected to the high-frequency device.

[0031] In one embodiment of the present invention, the first section has a third processing groove and a fourth processing groove that are spaced apart. In the mating state, the two third processing grooves form a third processing space, and the two fourth processing grooves form a fourth processing space. The third processing space is located below the first processing space, and the fourth processing space is located below the second processing space.

[0032] The present invention also provides an induction brazing system, comprising:

[0033] Positioning tooling, used to place the workpiece to be welded;

[0034] A high frequency device is spaced apart from the positioning tooling;

[0035] In the induction soldering device as described above, the two induction coil assemblies are electrically connected to the high-frequency device, so that the two induction coil assemblies and the high-frequency device form a conductive loop.

[0036] In one embodiment of the present invention, at least two positioning fixtures are provided, and the induction brazing system further comprises a mobile device, the induction brazing device is transmission-connected to the mobile device, and the mobile device drives the induction brazing device to move above any of the positioning fixtures.

[0037] In one embodiment of the present invention, at least two of the positioning fixtures are arranged at intervals along the opening and closing direction of the two induction coil assemblies;

[0038] Alternatively, the induction brazing system further comprises a turntable, and at least two positioning fixtures are arranged on the turntable and spaced apart along the circumference of the turntable.

[0039] In the induction brazing method proposed in the present invention, first, multiple connecting pipes of the workpieces to be welded are brought into contact to form multiple joints; then a mobile device is used to drive the induction brazing device to automatically move to the multiple joints; then, the induction brazing device can be used to perform one-time brazing work on the multiple joints of the workpieces to be welded, which can not only effectively improve the brazing efficiency, but also realize automated welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0041] Figure 1 A top view of an embodiment of the induction brazing device of the present invention in a mating state;

[0042] Figure 2 A side view of an embodiment of the induction brazing device of the present invention in a mating state;

[0043] Figure 3 A top view of an embodiment of the induction brazing device of the present invention during brazing;

[0044] Figure 4 A side view of an embodiment of the induction brazing device of the present invention during brazing;

[0045] Figure 5 A schematic diagram of the current flow during brazing of an embodiment of an induction brazing device of the present invention;

[0046] Figure 6 A top view of an embodiment of the induction brazing device of the present invention in an open state;

[0047] Figure 7 A top view of another embodiment of the induction brazing device of the present invention in a mating state;

[0048] Figure 8 A side view of another embodiment of the induction brazing device of the present invention in a mating state;

[0049] Fig. 9 A partial top view of another embodiment of the induction brazing device of the present invention in a mating state;

[0050] Fig.10 A partial top view of another embodiment of the induction brazing device of the present invention during brazing;

[0051] Fig.11A top view of another embodiment of the induction brazing device of the present invention in a mating state;

[0052] Fig.12 A top view of an embodiment of the induction brazing system of the present invention during brazing;

[0053] Fig.13 A top view of another embodiment of the induction brazing system of the present invention during brazing;

[0054] Fig.14 The figure is a flow chart of an embodiment of the induction brazing method of the present invention.

[0055] Description of Figure Numbers:

[0056]

[0057]

[0058] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0059] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0060] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0061] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0062] The inventors have discovered that high-frequency induction brazing can be used to weld the four-way valve. Specifically, the four-way valve and the pipeline have four welding points, three of which are close to each other, and the other welding point is far away from the first three welding points. An open induction brazing device is used to perform brazing in two steps. In the first step, the three welding points that are close to each other are brazed, and in the second step, the other welding point is brazed. However, the above welding form is still difficult to meet the automated welding scenarios, and the brazing efficiency is low.

[0063] The invention provides an induction brazing method, aiming to realize automatic welding.

[0064] The specific steps of the induction brazing method of the present invention are described below:

[0065] Combined with reference Fig.14 In one embodiment of the induction brazing method of the present invention, the induction brazing method comprises the following steps:

[0066] S10, contacting the multiple connecting pipes of the workpiece 2000 to be welded to form multiple joints; specifically, the multiple connecting pipes of the workpiece 2000 to be welded can be contacted manually to form joints; or, a clamping mechanism or other equipment can be used to contact the multiple connecting pipes of the workpiece 2000 to be welded to form joints; the clamping mechanism belongs to the prior art and will not be described in detail here.

[0067] S20, using a mobile device 400 to drive the induction brazing device 100 to move to multiple joints; specifically, the mobile device 400 can drive the induction brazing device 100 to move horizontally, can also drive the induction brazing device 100 to move up and down, can also drive the induction brazing device 100 to move in rotation, flipping and other directions, as long as the induction brazing device 100 can be smoothly driven to move to multiple joints; the mobile device 400 belongs to the prior art and will not be described in detail here.

[0068] S30, using the induction brazing device 100 to braze multiple joints at one time; specifically, the induction brazing device 100 can braze three, four, five or more joints of the workpiece 2000 to be welded at one time, depending on the number of joints of the workpiece 2000 to be welded.

[0069] It can be understood that in the induction brazing method proposed in the present invention, first, multiple connecting pipes of the workpiece 2000 to be welded are contacted to form multiple joints; then the mobile device 400 is used to drive the induction brazing device 100 to automatically move to the multiple joints; then, the induction brazing device 100 can be used to perform one-time brazing work on the multiple joints of the workpiece 2000 to be welded, which can not only effectively improve the brazing efficiency, but also realize automated welding.

[0070] Further, see Figures 3 to 6 In one embodiment of the induction brazing method of the present invention, the plurality of joints include at least two first joints and one second joint, the at least two first joints are arranged side by side and located in the first joint area 2100, the second joint is located in the second joint area 2200, and the first joint area 2100 and the second joint area 2200 are separated from each other; the first joint and the second joint are brazed at one time using the induction brazing device 100.

[0071] With such arrangement, after the multiple connecting pipes of the workpiece 2000 to be welded are brought into contact to form multiple joints, the induction brazing device 100 can be used to braze the first joint and the second joint of the workpiece 2000 to be welded at one time, without the need to braze the workpiece 2000 to be welded in two steps at least two first joints in the first joint area 2100 and the second joint in the second joint area 2200, thereby further improving the brazing efficiency.

[0072] In some embodiments, the workpiece 2000 to be welded can be a four-way valve, which includes three first joints and one second joint. The three first joints are arranged side by side and located in the first joint area 2100, and the second joint is located in the second joint area 2200. In this way, the induction brazing device 100 can be used to perform induction brazing on the four welding points between the four-way valve and the pipeline at the same position at one time.

[0073] Further, see Figures 3 to 6 In one embodiment of the induction brazing method of the present invention, the induction brazing device 100 includes at least two induction coil assemblies 10 and a driving assembly 20 for driving at least one of the induction coil assemblies 10 to move; wherein the driving assembly 20 drives the induction coil assembly 10 to move to an open state, and a mobile device 400 is used to drive the induction brazing device 100 to move to multiple joints; the driving assembly 20 drives the induction coil assembly 10 to move to a matching state, so that the two induction coil assemblies 10 enclose a processing space, and the processing space envelops a first joint area 2100 and a second joint area 2200, and a high-frequency device 300 is used to supply power to the two induction coil assemblies 10, so that the high-frequency device 300 and the two induction coil assemblies 10 form a conductive loop, so as to perform a one-time brazing operation on the first joint and the second joint.

[0074] In this way, after the multiple joints of the workpiece 2000 to be welded are brought into contact to form multiple joints, the driving component 20 can drive at least one induction coil component 10 to move so that the two induction coil components 10 are moved away from each other to an open state; then, the mobile device 400 is used to drive the induction brazing device 100 to move to the multiple joints of the workpiece 2000 to be welded so that the multiple joints are located between the two induction coil components 10; then, the driving component 20 drives at least one induction coil component 10 to move again so that the two induction coil components 10 are moved closer to each other to a mating state. , so as to form a processing space. At this time, the processing space will envelope the first joint area 2100 and the second joint area 2200, so that the first joint and the second joint are both located in the processing space; then, the high-frequency device 300 is used to power the two induction coil assemblies 10, so that the high-frequency device 300 and the two induction coil assemblies 10 form a conductive loop, so that a changing magnetic field is generated in the processing space, so as to couple the surface of the workpiece 2000 to generate an induced electromotive force and an induced eddy current, and rely on the eddy current to generate heat to achieve the purpose of welding the first joint and the second joint of the workpiece 2000 to be welded.

[0075] Furthermore, in one embodiment of the induction brazing method of the present invention, a heating device is used to heat the multiple joints, and at the same time, the driving component 20 drives the induction coil component 10 to move to an open state.

[0076] With such an arrangement, a heating device can be used to preheat multiple joints of the workpiece 2000 to be welded. During preheating, the driving component 20 drives the induction coil component 10 to move to an open state, thereby shortening the preheating waiting time and further improving the automated operation rhythm.

[0077] Further, see Fig.12 , Fig.13 In one embodiment of the induction brazing method of the present invention, after the step of “contacting the multiple connecting pipes of the workpiece 2000 to be welded to form multiple joints”, it also includes: placing the workpiece 2000 to be welded on a positioning tool 200.

[0078] With such arrangement, the workpiece 2000 to be welded can be accurately positioned by the positioning fixture 200, so that the subsequent induction brazing device 100 can accurately braze multiple joints. At the same time, there is no need for the staff to hold the workpiece 2000 to be welded all the time, which can further improve the automated operation rhythm.

[0079] In actual application, the workpiece 2000 to be welded can be placed on the positioning fixture by using equipment such as a robot or manually.

[0080] Furthermore, one or at least two positioning tools 200 may be provided.

[0081] Furthermore, the positioning tool 200 can specifically fix the workpiece 2000 to be welded by clamping, adsorption, etc.

[0082] Further, see Fig.12 , Fig.13 In one embodiment of the induction brazing method of the present invention, at least two workpieces 2000 to be welded are placed on at least two positioning fixtures 200 respectively;

[0083] The mobile device 400 is used to drive the induction brazing device 100 to move to any positioning fixture 200, so that the induction brazing device 100 can braze multiple joints of any workpiece 2000 to be welded at one time.

[0084] In this way, by providing at least two positioning fixtures 200, at least one workpiece 2000 to be welded is placed on each positioning fixture 200, and then driven by the mobile device 400, the induction brazing device 100 can be driven to move to any positioning fixture 200, and then the workpiece 2000 to be welded on the positioning fixture 200 is induction brazed to achieve the effect of automatic brazing; and when the induction brazing operation is performed on the workpiece 200 to be welded on one of the positioning fixtures 200, the user can take and place the workpiece 2000 to be welded on another positioning fixture 200. When taking and placing the fixture to be welded, the induction brazing device 100 does not need to stop and wait, thereby further improving the brazing efficiency.

[0085] In actual application, the at least two positioning fixtures 200 can be distributed in a straight line, in a circle, in a staggered manner, in a matrix, etc.

[0086] Further, see Fig.12 In one embodiment, at least two positioning fixtures 200 are spaced apart along the opening and closing direction of the two induction coil assemblies 10; in this way, the induction brazing device 100 can be driven to move in a straight line by the mobile device 400, and the induction brazing device 100 can be driven to move above any positioning fixture 200, thereby avoiding the problem of low efficiency caused by driving the induction brazing device 100 to rotate or do other movements.

[0087] In some embodiments, at least two positioning tools 200 may also be disposed on a conveyor belt, so that the at least two positioning tools 200 are driven by the conveyor belt to move to the bottom of the induction brazing device 100 in sequence.

[0088] Further, see Fig.13In another embodiment, the induction brazing system 1000 further includes a turntable 500, and at least two positioning fixtures 200 are disposed on the turntable 500 and are spaced apart along the circumference of the turntable 500; in this way, by arranging at least two positioning fixtures 200 on the turntable 500 and spaced apart along the circumference of the turntable 500, the at least two positioning fixtures 200 can be driven to move sequentially to the bottom of the induction brazing device 100 under the rotation of the turntable 500; thereafter, the mobile device 400 can drive the induction brazing device 100 to descend, and the induction brazing device 100 can be used to perform a one-time brazing operation on multiple joints of the workpiece 2000 to be welded.

[0089] Combined with reference Figures 1 to 11 The present invention also proposes an induction brazing device 100 applied to the induction brazing method as described above, the induction brazing device 100 includes two induction coil assemblies 10 and a driving assembly 20; the two induction coil assemblies 10 are both used to be electrically connected to the high-frequency device 300, so that the two induction coil assemblies 10 and the high-frequency device 300 form a conductive loop; the driving assembly 20 is transmission-connected to at least one induction coil assembly 10, and the driving assembly 20 drives at least one induction coil assembly 10 to move, so that the two induction coil assemblies 10 have an open state and a mating state; in the open state, the two induction coil assemblies 10 are away from each other; in the mating state, the two induction coil assemblies 10 are close to each other to form a processing space, and the processing space can accommodate multiple joints of the workpiece 2000 to be welded at one time.

[0090] It can be understood that in the induction brazing device 100 proposed in the present invention, at least one induction coil assembly 10 can be driven to move by the driving assembly 20 so that the two induction coil assemblies 10 move away from each other to an open state; then, the mobile device 400 is used to drive the induction brazing device 100 to move to multiple joints of the workpiece 2000 to be welded; then, the driving assembly 20 drives at least one induction coil assembly 10 to move again so that the two induction coil assemblies 10 approach each other to a matching state to form a processing space, at this time, multiple joints of the workpiece 2000 to be welded can be accommodated in the processing space at the same time; then, the high-frequency device 300 is used to power the two induction coil assemblies 10 so that the high-frequency device 300 and the two induction coil assemblies 10 form a conductive loop, so that a changing magnetic field is generated in the processing space, so as to couple the surface of the workpiece 2000 to be welded to generate an induced electromotive force and an induced eddy current, and rely on the eddy current to generate heat to achieve the purpose of one-time welding of multiple joints of the workpiece 2000 to be welded.

[0091] Therefore, the induction brazing device 100 proposed in this solution can perform induction brazing on multiple joints of the workpiece 2000 to be welded at the same position at the same time, without the need to perform the brazing in two steps, thereby effectively improving the brazing efficiency.

[0092] In some embodiments, when the workpiece 2000 to be welded is a four-way valve, the induction brazing device 100 can perform induction brazing on four welding points between the four-way valve and the pipeline at the same position at the same time.

[0093] In this embodiment, the driving component 20 can drive at least one of the two induction coil components 10 to move so that the two induction coil components 10 can move away from each other or approach each other to achieve switching between the open state and the matching state. In the open state, the two induction coil components 10 move away from each other, and the induction brazing device 100 is in a non-welding state, which can facilitate the placement of the workpiece 2000 to be welded between the two induction coil components 10, or facilitate the removal of the workpiece 2000 to be welded from the space between the two induction coil components 10; in the matching state, the two induction coil components 10 approach each other to form a processing space, so that the two induction coil components 10 surround multiple joints of the workpiece 2000 to be welded. At this time, the high-frequency device 300 passes an alternating current in the wire loop, so that a changing magnetic field is generated in the processing space, so as to couple the surface of the workpiece 2000 to be welded to generate an induced electromotive force and an induced eddy current, and rely on the eddy current to generate heat to achieve the purpose of one-time welding of multiple joints of the workpiece 2000 to be welded.

[0094] Furthermore, compared to the use of an open-type induction brazing device 100, when the induction brazing device 100 proposed in the present scheme is brazing the workpiece 2000 to be welded, the two induction coil assemblies 10 will surround multiple joints of the workpiece 2000 to be welded (including at least two first joints located in the first joint area 2100 and the second joint located in the second joint area 2200), which can increase the range of direct heating and radiation of the surface of the workpiece 2000 by induction heating, and can avoid the problems of large heating temperature difference and low brazing efficiency caused by heat conduction in the existing open-type induction brazing device 100, thereby effectively improving the heating uniformity and brazing efficiency of the induction heating on the surface of the workpiece 2000 to be welded.

[0095] In addition, the induction brazing device 100 proposed in this scheme adopts an open-and-closed brazing device, which enables the two induction coil assemblies 10 to switch between an open state and a mating state, thereby facilitating the automatic movement of the induction brazing device 100 to prevent interference between the induction brazing device 100 and the workpiece 2000 to be welded, thereby facilitating the picking and placing of the workpiece 2000 to be welded.

[0096] In some embodiments, the drive assembly 20 can drive one of the induction coil assemblies 10 to move so that the induction coil assembly 10 can move toward or away from the other induction coil assembly 10, so that the two induction coil assemblies 10 move closer to or away from each other to switch between the mating state and the open state.

[0097] In another embodiment, the driving component 20 can also drive the two induction coil components 10 to move simultaneously, so that the two induction coils move toward each other or in opposite directions, so that the two induction coil components 10 move closer to each other or farther away from each other to switch between the mating state and the open state.

[0098] It should be noted that, whether the two induction coil assemblies 10 are in an open state or a mating state, the on-off of the conductive circuit formed by the two induction coil assemblies 10 and the high-frequency device 300 will not be affected, so that there is no need to form a conductive circuit by contacting the two induction coil assemblies 10; therefore, when the two induction coil assemblies 10 are close to each other to a mating state, the two induction coil assemblies 10 can be separated, so that not only can the contact of the two induction coil assemblies 10 to cause short circuit or heating and other faults can be avoided, but also the two induction coil assemblies 10 can perform induction heating welding on the workpiece 2000 to be welded without contact, thereby avoiding the phenomenon of conductivity or insufficient conductivity due to poor contact of the heating coil, and improving the brazing quality.

[0099] In actual application, the specific structure of the drive assembly 20 can be determined according to the actual usage. For example, it can be a cylinder drive structure, an oil cylinder drive structure or a motor drive structure, etc., as long as it can drive at least one of the induction coil assemblies 10 to move to switch between the open state and the engaged state.

[0100] Further, see Figure 1 , Figure 3 , Figure 7 In one embodiment of the induction brazing device 100 of the present invention, the induction coil assembly 10 includes a heating coil segment 11, a first connecting segment 12 and a second connecting segment 13; the heating coil segment 11 is provided with a first processing groove 11a and a second processing groove 11b arranged at intervals; in the mating state, the two first processing grooves 11a constitute a first processing space 10a, the two second processing grooves 11b constitute a second processing space 10b, and the first processing space 10a and the second processing space 10b constitute a processing space; one end of the first connecting segment 12 is connected to the heating coil segment 11, and the other end of the second connecting segment 13 is used for electrical connection to the high-frequency device 300; one end of the second connecting segment 13 is connected to an end of the heating coil segment 11 away from the first connecting segment 12, and the ends of the two second connecting segments 13 away from the heating coil segment 11 are connected to each other.

[0101] In this way, by providing the first processing groove 11a and the second processing groove 11b spaced apart on the heating coil segment 11, when the driving component 20 drives at least one induction coil component 10 to move to the mating state, the two first processing grooves 11a can form the first processing space 10a, and the two second processing grooves 11b can form the second processing space 10b; in addition, one end of the heating coil segment 11 is electrically connected to the high-frequency device 300 through the first connecting segment 12, and the other end of the heating coil is electrically connected through the second connecting segment 13, so that a conductive loop can be formed between the high-frequency device 300 and the two first connecting segments 12, the two heating coil segments 11, and the two second connecting segments 13. In this way, when the high-frequency device 300 passes an alternating current in the conductive loop, a changing magnetic field can be generated at the first processing space 10a and the second processing space 10b between the two heating coil segments 11, so as to generate an induced electromotive force and an induced eddy current on the surface of the workpiece 2000 to be welded, and the eddy current generates heat to achieve the purpose of induction welding of the workpiece 2000 to be welded.

[0102] Specifically, one end of the second connecting section 13 away from the heating coil section 11 is a connecting end 131, and the electrical conduction function of the two induction coil assemblies 10 is realized by connecting the two connecting ends 131. In addition, the connecting end 131 of the second connecting section 13 is away from the heating welding area, so that the stability of the conductive connection between the two induction coil assemblies 10 will not be affected by welding slag splashing or excessive temperature, thereby ensuring the reliability of the electrical conduction of the two induction coil assemblies 10.

[0103] In the actual application process, combined with reference Figure 1 , Figure 3 , Figures 5 to 7 , Fig. 9 , Fig.10 The portion of the heating coil segment 11 where the first processing groove 11a is formed can be a semicircular arc segment, so that the first processing space 10a formed by the two first processing grooves 11a can be a circular space or an elliptical space, and the second processing space 10b formed by the two second processing grooves 11b can be a circular space or an elliptical space; or, in combination with reference to Fig.11The portion of the heating coil segment 11 formed with the first processing groove 11a may also be a semi-rectangular frame segment, so that the first processing space 10a formed by the two first processing grooves 11a may be a rectangular space, and the second processing space 10b formed by the two second processing grooves 11b may be a rectangular space; alternatively, the portion of the heating coil segment 11 formed with the first processing groove 11a may also be a contoured frame segment, so that the first processing space 10a formed by the two first processing grooves 11a may be a contoured space that matches the shape of the first joining area 2100 of the workpiece 2000 to be welded, and the second processing space 10b formed by the two second processing grooves 11b may be a contoured space that matches the shape of the second joining area 2200 of the workpiece 2000 to be welded.

[0104] In the actual application process, combined with reference Figure 1 , Figure 3 , Figures 5 to 7 The first processing space 10a may be located between the second processing space 10b and the driving assembly 20, that is, the first processing groove 11a is located between the second processing groove 11b and the driving assembly 20; or, in combination with reference to Figures 9 to 11 , the second processing space 10b can be located between the first processing space 10a and the driving assembly 20, that is, the second processing groove 11b is located between the first processing groove 11a and the driving assembly 20. That is, the positions of the first processing space 10a and the second processing space 10b can be exchanged, as long as the first joining area 2100 and the second joining area 2200 of the workpiece 2000 to be welded can be respectively accommodated in the first processing space 10a and the second processing space 10b, which is not specifically limited here.

[0105] In the actual application process, combined with reference Figures 1 to 6 , Figures 9 to 11 , the heating coil segment 11 may be a single-turn coil; or, in conjunction with Figure 7 , Figure 8 The heating coil segment 11 can be a double-turn coil; or, the heating coil segment 11 can also be a multi-turn coil, as long as it can generate a changing magnetic field in the first processing space 10a and the second processing space 10b to couple and generate induced electromotive force and induced eddy current on the surface of the workpiece 2000 to be welded, and rely on eddy current heating to achieve the purpose of induction welding of the workpiece 2000 to be welded, and no specific limitation is made here.

[0106] Further, see Figure 1 , Figure 3 , Figure 5 , Figure 7In one embodiment of the induction brazing device 100 of the present invention, the induction coil assembly 10 further includes a first magnetic conductor 14 and a second magnetic conductor 15. The first magnetic conductor 14 and the second magnetic conductor 15 are both arranged on the outside of the heating coil segment 11, and the first magnetic conductor 14 is arranged corresponding to the first processing groove 11a, and the second magnetic conductor 15 is arranged corresponding to the second processing groove 11b.

[0107] In this way, by providing the first magnetic conductor 14 and the second magnetic conductor 15 on the outer side of the heating coil segment 11, so that the first magnetic conductor 14 is set corresponding to the first processing groove 11a, and the second magnetic conductor 15 is set corresponding to the second processing groove 11b, the heating magnetic field can be enhanced by the first magnetic conductor 14 and the second magnetic conductor 15, thereby improving the heating efficiency of the induction brazing device 100.

[0108] In some embodiments, when the portions of the heating coil segment 11 formed with the first processing groove 11a and the second processing groove 11b are both semicircular segments, the first magnetic conductor 14 and the second magnetic conductor 15 can be in a semicircular structure, so that the first magnetic conductor 14 is in close contact with the outer side of the portion of the heating coil segment 11 formed with the first processing groove 11a, and the second magnetic conductor 15 is in close contact with the outer side of the portion of the heating coil segment 11 formed with the second processing groove 11b, so as to ensure the connection reliability between the first magnetic conductor 14 and the second magnetic conductor 15.

[0109] In other embodiments, when the heating coil segment 11 forms the first processing groove 11a and then the second processing groove 11b, both of which are semi-rectangular frame segments, the first magnetic conductor 14 and the second magnetic conductor 15 can be in a semi-rectangular frame structure, so that the first magnetic conductor 14 is in close contact with the outer side of the portion of the heating coil segment 11 forming the first processing groove 11a, and the second magnetic conductor 15 is in close contact with the outer side of the portion of the heating coil segment 11 forming the second processing groove 11b, so as to ensure the connection reliability between the first magnetic conductor 14 and the second magnetic conductor 15.

[0110] Further, see Figures 1 to 4 , Figures 6 to 8 In one embodiment of the induction brazing device 100 of the present invention, the induction brazing device 100 further includes a flexible electrical connector 30 , and the flexible electrical connector 30 connects one end of the two second connecting segments 13 away from the heating coil segment 11 .

[0111] In this arrangement, by using a flexible electrical connector 30 to connect the ends of the two second connecting segments 13 away from the heating coil segment 11, since the flexible electrical connector 30 can be arbitrarily stretched and bent within a preset range, when the two induction coil assemblies 10 are approaching or moving away from each other, the ends of the two second connecting segments 13 away from the heating coil segment 11 can always be connected to the flexible electrical connector 30 without any circuit breakage. Therefore, the conductive loop formed by the high-frequency circuit and the two induction coil assemblies 10 will not be affected by the movement of the two induction coil assemblies 10 approaching or moving away from each other.

[0112] In actual application, the end of the second connection section 13 away from the heating coil section 11 (connection end 131) can be an integral structure with the flexible electrical connector 30, or can be connected to the flexible electrical connector 30 by mechanical connection methods such as screws and buckles. Of course, in some embodiments, the end of the second connection section 13 away from the heating coil section 11 (connection end 131) is an integral structure with the flexible electrical connector 30, which can avoid the problem of lack of continuous contact due to oxidation or wear of the contact part caused by the mechanical connection method.

[0113] In actual application, the flexible electrical connector 30 may be a flexible cable, a conductive flexible bus or the like.

[0114] Further, see Figure 1 , Figure 3 , Figure 6 , Figure 7 In one embodiment of the induction brazing device 100 of the present invention, the first connecting section 12 includes a first section 121, a flexible section 122 and a second section 123; one end of the first section 121 is connected to the heating coil section 11, and the first section 121 is located below the heating coil section 11; one end of the flexible section 122 is connected to an end of the first section 121 away from the heating coil section 11; one end of the second section 123 is connected to an end of the flexible section 122 away from the first section 121, and the other end of the second section 123 is used to be electrically connected to the high-frequency device 300.

[0115] In this way, the connection between the first connecting section 12 and the heating coil section 11 is achieved through the first section 121, and the connection between the first connecting section 12 and the high-frequency device 300 is achieved through the second section 123, and the connection between the first section 121 and the second section 123 is achieved through the flexible section 122. Since the flexible section 122 can be arbitrarily stretched and bent within a preset range, when the two induction coil assemblies 10 are approaching or moving away from each other, the first section 121 and the second section 123 can always be connected through the flexible section 122 without a circuit breaker. Therefore, the conductive loop formed by the high-frequency circuit and the two induction coil assemblies 10 will not be affected by the movement of the two induction coil assemblies 10 approaching or moving away from each other.

[0116] Further, see Figures 1 to 4 In one embodiment of the induction brazing device 100 of the present invention, the first section 121 has a third processing groove and a fourth processing groove that are spaced apart. In the mating state, the two third processing grooves form a third processing space, and the two fourth processing grooves form a fourth processing space. The third processing space is located below the first processing space 10a, and the fourth processing space is located below the second processing space 10b.

[0117] Such arrangement can increase the compactness of the overall structure. In addition, the shape of the portion of the first section 121 located directly below the heating coil section 11 can be consistent with the shape of the heating coil section 11. Therefore, in the mating state, the two first sections 121 can form a third processing space and a fourth processing space, the third processing space is located below the first processing space 10a, and the fourth processing space is located below the second processing space 10b. In addition to being respectively accommodated in the first processing space 10a and the second processing space 10b, the first joining area 2100 and the second joining area 2200 of the workpiece 2000 to be welded can also be respectively accommodated in the third processing space and the fourth processing space, so that the two first sections 121 can generate a changing magnetic field in the third processing space and the fourth processing space, so as to increase the radiation area of ​​the first joining area 2100 and the second joining area 2200, and improve the brazing efficiency.

[0118] Further, see Figures 1 to 4 In one embodiment of the induction brazing device 100 of the present invention, the induction brazing device 100 further includes a connecting plate 40 , and the two induction coil assemblies 10 are used to connect to the high-frequency device 300 via the connecting plate 40 .

[0119] With such configuration, the two induction coil assemblies 10 can be more stably connected to the high-frequency device 300 through the connecting plate 40, so that the connecting plate 40 can support and fix the two induction coil assemblies 10, thereby ensuring the conductive connection between the two induction coil assemblies 10 and the high-frequency device 300.

[0120] Further, see Figure 2 , Figure 4 , Figure 8 In one embodiment of the induction brazing device 100 of the present invention, the induction brazing device 100 further includes a cooling water pipe, and the cooling water pipe 50 is used to dissipate heat from the driving component 20 and / or the induction coil component 10.

[0121] With such an arrangement, the coolant can be passed into the drive assembly 20 and / or the induction coil assembly 10 through the cooling soft water pipe to cool the drive assembly 20 and / or the induction coil assembly 10 to prevent damage due to over-temperature.

[0122] In some embodiments, a cooling channel may be formed in the drive assembly 20 so that the cooling water pipe 50 and the cooling channel form a circulation channel, thereby cooling the drive assembly 20 .

[0123] In other embodiments, cooling channels may be formed in the heating coil segment 11, the first connecting segment 12, and the second connecting segment 13 of the induction coil assembly 10, so that the cooling water pipe 50 and the cooling channel form a circulation channel, thereby cooling the induction coil assembly 10.

[0124] Further, see Figure 1 , Figure 3 , Figure 7 In one embodiment of the induction brazing device 100 of the present invention, the driving assembly 20 includes a driving member 21 and two insulating plates 22; the two insulating plates 22 are arranged on both sides of the driving member 21, and each induction coil assembly 10 is connected to the driving member 21 through an insulating plate 22.

[0125] With such a configuration, the driving member 21 can simultaneously drive the two insulating plates 22 to move closer to or away from each other, and then drive the two induction coil assemblies 10 to move respectively through the two insulating plates 22, so that the function of simultaneously driving the two induction coil assemblies 10 to move to switch between the open state and the mating state can be realized through one driving member 21. In addition, the use of one set of driving members 21 can avoid the problems of inconsistent opening and closing actions and poor repeatability of the two induction coil assemblies 10 due to differences in cylinder processing, assembly, and air source pressure when multiple sets of driving members 21 are used; in addition, the overall size and installation difficulty of the driving assembly 20 can be reduced, while reducing costs.

[0126] In addition, by using the insulating plate 22 to realize the connection between the driving member 21 and the induction coil assembly 10, the installation area between the driving member 21 and the induction coil assembly 10 can be increased by the insulating plate 22. In actual application, the two induction coil assemblies 10 can be installed below the driving member 21. At this time, the flexible electrical connector 30 connecting the two second connecting sections 13 is also lower than the height position of the driving member 21. Therefore, when the driving member 21 drives the two induction coil assemblies 10 to move, the stretching or bending action of the flexible electrical connector 30 will not interfere with the driving member 21 or other components, thereby ensuring the reliability of the overall structure.

[0127] In actual application, the driving member 21 can be a linear opening and closing cylinder, a structure in which a motor and a lead screw nut cooperate, or a structure in which a motor and a gear rack cooperate. As long as it can drive the two insulating plates 22 to move at the same time, and then drive the two induction coil assemblies 10 to move at the same time, no specific limitation is made here.

[0128] In some embodiments, in order to ensure the connection reliability between the insulating plate 22 and the driving member 21, a fixing screw 23 may be used to achieve the connection between the insulating plate 22 and the driving member 21. In addition, in order to ensure the connection reliability between the insulating plate 22 and the induction coil assembly 10, a fastening screw 24 may be used to achieve the connection between the insulating plate 22 and the induction coil assembly 10.

[0129] Combined with reference Fig.12 , Fig.13 The present invention further proposes an induction brazing system 1000, which includes a positioning tool 200, a high-frequency device 300 and the induction brazing device 100 as described above. The specific structure of the induction brazing device 100 refers to the above embodiment. Since the induction brazing system 1000 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here one by one.

[0130] Among them, the positioning tool 200 is used to place the workpiece 2000 to be welded; the high-frequency device 300 is arranged at a distance from the positioning tool 200; the induction brazing device 100 is located above the positioning tool 200, and the two induction coil assemblies 10 are electrically connected to the high-frequency device 300, so that the two induction coil assemblies 10 and the high-frequency device 300 form a conductive loop.

[0131] It can be understood that in the induction brazing system 1000 proposed by the present invention, the workpiece 2000 to be welded can be placed on the positioning tool 200; then, at least one induction coil assembly 10 is driven to move by the driving assembly 20 so that the two induction coil assemblies 10 are moved away from each other to an open state; then, the mobile device 400 is used to drive the induction brazing device 100 to move to multiple joints of the workpiece 2000 to be welded; then, at least one induction coil assembly 10 is driven to move again by the driving assembly 20 so that the two induction coil assemblies 10 are close to each other to a matching state to form a processing space, at this time, multiple joints of the workpiece 2000 to be welded can be accommodated in the processing space at the same time; then, the high-frequency device 300 is used to power the two induction coil assemblies 10 so that the high-frequency device 300 and the two induction coil assemblies 10 form a conductive loop, so that a changing magnetic field is generated in the processing space, so as to couple the surface of the workpiece 2000 to generate an induced electromotive force and an induced eddy current, and rely on the eddy current to generate heat to achieve the purpose of one-time welding of multiple joints of the workpiece 2000 to be welded.

[0132] Therefore, the induction brazing system 1000 proposed in this solution can perform induction brazing on multiple joints of the workpiece 2000 to be welded at the same position at the same time, without the need to perform the brazing in two steps, thereby effectively improving the brazing efficiency.

[0133] In actual application, one or at least two positioning tools 200 may be provided.

[0134] In actual application, the positioning tool 200 can specifically fix the workpiece 2000 to be welded by clamping, adsorption, etc.

[0135] Further, see Fig.12 , Fig.13 In one embodiment of the induction brazing system 1000 of the present invention, at least two positioning fixtures 200 are provided, and the induction brazing system 1000 also includes a mobile device 400, and the induction brazing device 100 is transmission-connected to the mobile device 400, and the mobile device 400 drives the induction brazing device 100 to move above any positioning fixture 200.

[0136] In this way, by providing at least two positioning fixtures 200, at least one workpiece 2000 to be welded is placed on each positioning fixture 200, and then driven by the mobile device 400, the induction brazing device 100 can be driven to move above any positioning fixture 200, and then the workpiece 2000 to be welded on the positioning fixture 200 is induction brazed to achieve the effect of automatic brazing; and when the induction brazing operation is performed on the workpiece 200 to be welded on one of the positioning fixtures 200, the user can take and place the workpiece 2000 to be welded on another positioning fixture 200. When taking and placing the fixture to be welded, the induction brazing device 100 does not need to stop and wait, thereby further improving the brazing efficiency.

[0137] In actual application, the at least two positioning fixtures 200 can be distributed in a straight line, in a circle, in a staggered manner, in a matrix, etc.

[0138] Further, see Fig.12 In one embodiment of the induction brazing system 1000 of the present invention, at least two positioning fixtures 200 are arranged at intervals along the opening and closing direction of the two induction coil assemblies 10 .

[0139] With such arrangement, the induction brazing device 100 can be driven to perform linear motion by the mobile device 400, and can be driven to move above any positioning tool 200, thereby avoiding the problem of low efficiency caused by driving the induction brazing device 100 to rotate or perform other movements.

[0140] In some embodiments, at least two positioning tools 200 may also be disposed on a conveyor belt, so that the at least two positioning tools 200 are driven by the conveyor belt to move to the bottom of the induction brazing device 100 in sequence.

[0141] Further, see Fig.13 In another embodiment of the induction brazing system 1000 of the present invention, the induction brazing system 1000 further includes a turntable 500 , and at least two positioning fixtures 200 are disposed on the turntable 500 and spaced apart along the circumference of the turntable 500 .

[0142] In this way, by arranging at least two positioning fixtures 200 on the turntable 500 and arranging them at intervals along the circumference of the turntable 500, the at least two positioning fixtures 200 can be driven to move to the bottom of the induction brazing device 100 in sequence under the rotation of the turntable 500; then, the mobile device 400 can drive the induction brazing device 100 to descend; then, the driving component 20 drives the two induction coil components 10 to move to a matching state, so that multiple joints on the workpiece 2000 to be welded are simultaneously located in the processing space, so that the multiple joints can be induction brazed at the same time; after brazing is completed, the driving component 20 drives the two induction coil components 10 to move to an open state; then, the mobile device 400 drives the induction brazing device 100 to rise, and the cycle is repeated in sequence, so that at least two workpieces 2000 to be welded on the at least two positioning fixtures 200 can be induction brazed in sequence.

[0143] Further, see Fig.12 , Fig.13 In one embodiment of the induction brazing system 1000 of the present invention, the induction brazing system 1000 also includes a power supply host 600, a control system 700 and a circulating chiller 800; the power supply host 600 is electrically connected to the high-frequency device 300; the control system 700 is electrically connected to the power supply host 600; and the circulating chiller 800 is used to dissipate heat from the power supply host 600.

[0144] With such a configuration, the automatic operation of the power supply mainframe 600, the circulating chiller 800, the high frequency device 300, the drive assembly 20 and other components can be precisely controlled by the control system 700 to realize automatic brazing operation. Among them, the power supply mainframe 600 can supply power to the high frequency device 300 so that the high frequency device 300 passes an alternating current in the conductive circuit; the circulating chiller 800 can dissipate heat for the power supply mainframe 600 to prevent the power supply mainframe 600 from being damaged by high temperature.

[0145] In addition, since the traditional open-type induction brazing device 100 needs to be divided into two steps for brazing, two sets of high-frequency equipment 300, two sets of open-type induction brazing devices 100, two sets of mobile equipment 400, and four sets of positioning tooling 200 are required; and the induction brazing device 100 proposed in this scheme can perform induction brazing on the four welding points between the four-way valve and the pipeline at the same position at the same time, without the need to be divided into two steps for brazing, so only one set of high-frequency equipment 300, one set of induction brazing device 100, one set of mobile equipment 400, and two sets of positioning tooling 200 are needed, thereby reducing the number of high-frequency equipment 300, induction brazing device 100, mobile equipment 400 and positioning tooling 200 used, and reducing equipment costs.

[0146] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. An induction brazing method, characterized in that: The following steps are involved: contacting a plurality of nozzles of the workpieces to be welded to form a plurality of joints; Using a mobile device to drive the induction brazing device to move to a plurality of the joints; An induction brazing device is used to braze a plurality of the joints at one time.

2. The induction brazing method according to claim 1, characterized in that: The plurality of joints include at least two first joints and one second joint, the at least two first joints are arranged side by side and located in a first joint area, the second joint is located in a second joint area, and the first joint area is separated from the second joint area; The first joint and the second joint are brazed at one time using the induction brazing device.

3. The induction brazing method according to claim 2, characterized in that: The induction brazing device comprises at least two induction coil assemblies and a driving assembly for driving at least one of the induction coil assemblies to move; Wherein, the driving assembly drives the induction coil assembly to move to an open state, and a mobile device is used to drive the induction brazing device to move to a plurality of the joints; The driving component drives the induction coil component to move to a mating state, so that the two induction coil components enclose a processing space, and the processing space envelopes the first joint area and the second joint area. A high-frequency device is used to power the two induction coil components, so that the high-frequency device and the two induction coil components form a conductive loop, so as to perform a one-time brazing operation on the first joint and the second joint.

4. The induction brazing method according to claim 3, characterized in that: A heating device is used to heat the plurality of joints, and at the same time, the driving component drives the induction coil component to move to an open state.

5. The induction brazing method according to any one of claims 1 to 4, characterized in that: After the step of "contacting a plurality of nozzles of the workpieces to be welded to form a plurality of joints", the process further includes: The workpiece to be welded is placed on a positioning fixture.

6. The induction brazing method according to claim 5, characterized in that: At least two workpieces to be welded are placed on at least two of the positioning fixtures respectively; The mobile device is used to drive the induction brazing device to move to any of the positioning fixtures, so that the induction brazing device can braze multiple joints of any of the workpieces to be welded at one time.

7. An induction brazing device applied to the induction brazing method according to any one of claims 1 to 6, characterized in that: The induction brazing device comprises: Two induction coil assemblies, both used to be electrically connected to the high-frequency device, so that the two induction coil assemblies and the high-frequency device form a conductive loop; A driving assembly, which is in driving connection with at least one of the induction coil assemblies, and the driving assembly drives at least one of the induction coil assemblies to move, so that the two induction coil assemblies have an open state and a mating state; In the open state, the two induction coil assemblies are away from each other; In the mating state, the two induction coil assemblies are close to each other to form a processing space, and the processing space can accommodate multiple joints of the workpieces to be welded at one time.

8. The induction brazing device according to claim 7, characterized in that: The induction coil assembly comprises: The heating coil segment is provided with a first processing groove and a second processing groove arranged at intervals; in the matching state, the two first processing grooves form a first processing space, the two second processing grooves form a second processing space, and the first processing space and the second processing space constitute the processing space; a first connecting section, one end of which is connected to the heating coil section, and the other end of which is used to be electrically connected to the high-frequency device; A second connecting section, one end of the second connecting section is connected to an end of the heating coil section away from the first connecting section, and the ends of the two second connecting sections away from the heating coil section are electrically connected to each other.

9. The induction brazing device according to claim 8, characterized in that: The first connecting section comprises: a first section, one end of which is connected to the heating coil section, and the first section is located below the heating coil section; A flexible segment, one end of which is connected to an end of the first segment away from the heating coil segment; The second section has one end connected to one end of the flexible section away from the first section, and the other end of the second section is used for being electrically connected to the high-frequency device.

10. The induction brazing device according to claim 9, characterized in that The first section has a third processing groove and a fourth processing groove that are spaced apart. In the mating state, the two third processing grooves form a third processing space, and the two fourth processing grooves form a fourth processing space. The third processing space is located below the first processing space, and the fourth processing space is located below the second processing space.

11. An induction brazing system, characterized in that: include: Positioning tooling, used to place the workpiece to be welded; A high frequency device is spaced apart from the positioning tooling; According to the induction brazing device as described in any one of claims 7 to 10, the two induction coil assemblies are electrically connected to the high-frequency device so that the two induction coil assemblies and the high-frequency device form a conductive loop.

12. The induction brazing system according to claim 11, characterized in that At least two positioning fixtures are provided, and the induction brazing system further comprises a moving device, the induction brazing device is transmission-connected to the moving device, and the moving device drives the induction brazing device to move above any of the positioning fixtures.

13. The induction brazing system of claim 12, wherein: At least two of the positioning fixtures are arranged at intervals along the opening and closing directions of the two induction coil assemblies; Alternatively, the induction brazing system further comprises a turntable, and at least two positioning fixtures are arranged on the turntable and spaced apart along the circumference of the turntable.

Images