Robot electric permanent magnet end quick change device

Abstract

The present application relates to a kind of robot electric permanent magnet end quick-change device, wherein the device includes: R side main disc assembly (1) and T side main disc assembly (2), two are engaged and docked, and the R side main disc assembly (1) is installed at the end of robot arm, and the T side main disc assembly (2) is installed on the tool or equipment needing to be quickly replaced;Several magnetic conduction structures are arranged at the bottom of R side shell (1-13), and a cross lock catch (1-10) is arranged at the positive center position of bottom, the magnetic conduction structure and the magnetic conduction material arranged on cross lock catch (1-10) are magnetically interacted, the locking or loosening between R side main disc assembly (1) and T side main disc assembly (2) is realized by changing the engagement state of cross lock catch (1-10).The robot electric permanent magnet end quick-change device using the present application has small movement noise, no requirement for air quality, simple structure, low cost, fast response, and can effectively reduce energy consumption.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of electric permanent magnet quick change, especially to the field of robot quick change disc, and particularly to a robot electric permanent magnet end quick change device. BACKGROUND

[0002] The robot quick change disc is mainly composed of a robot side disc (R-side main disc) and a tool side disc (T-side main disc), and its working principle is based on compressed air as a power source to drive the internal mechanical structure to operate, so as to achieve the purpose of changing the gun of an industrial robot. The general working process is as follows:

[0003] The R-side main disc is usually installed at the end of the robot arm, and the T-side main disc is installed on the tool or equipment that needs to be quickly changed. When the robot approaches the target tool, the R-side main disc and the T-side main disc are mutually docked through a precise guide mechanism.

[0004] After the R-side and the T-side are successfully docked, the inner cavity of the R-side main disc pushes the piston upward through compressed air. At the same time, the piston moves and squeezes the steel ball to move outward. When the steel ball moves to the specified position, it just fits into the groove in the T-side main disc, achieving the purpose of locking. Conversely, the R-side main disc pushes the piston downward through reverse compressed air. At the same time, the piston moves and unloads the steel ball, which returns to the initial position in the inward direction, releasing the T-side main disc, achieving the purpose of releasing.

[0005] The existing technology has the following obvious disadvantages:

[0006] 1. High noise: During the operation of the pneumatic system, the high-speed flow of gas and the frequent opening and closing of the air valve will produce a lot of noise. For example, when compressed air is quickly discharged from the air tank or passes through a throttle valve, the gas flow interacts with the pipe wall and the internal structure of the element, forming aerodynamic noise. Long-term work in such a high-noise environment not only damages the hearing of the operator, but also may interfere with the sound signal exchange in other working environments.

[0007] 2. Low energy efficiency: The generation of compressed air requires a large amount of electrical energy, and there is energy loss in the compression, transmission and use process. First, the conversion efficiency is not 100% when the air compressor converts electrical energy into pressure energy of compressed air. Second, in the transmission process, due to factors such as pipe friction resistance and leakage, energy will be further wasted. In addition, the energy utilization rate of the pneumatic system is relatively low, for example, during the movement of the air cylinder, most of the expanded gas is directly discharged into the atmosphere after doing work, without fully recycling the energy.

[0008] 3. High requirements for air quality: If the compressed air contains moisture, oil stains, dust and other impurities, it will cause damage to the pneumatic components. Moisture may cause metal components to rust and corrode, shortening the service life of the components; oil stains may contaminate the working environment and affect the normal operation of components such as air valves, causing them to jam or malfunction; dust and other particulate impurities may exacerbate the wear of internal seals and moving parts of the components, reducing the reliability and performance of the system. Therefore, in order to ensure normal operation of the system, special air purification equipment is required, which increases the complexity and cost of the system.

[0009] 4. High cost: Although the price of a single pneumatic component is relatively low, to build a complete and reliable pneumatic system, in addition to basic execution components, control components, air compressors, air tanks, filters, dryers and other auxiliary equipment are also required, the overall equipment procurement cost is high. In addition, due to the high requirements for air quality, the replacement of air filtration components, inspection and repair of damaged components caused by impurities during maintenance will also result in high maintenance costs.

[0010] 5. Limited response speed: Although the response speed of the pneumatic system is faster than that of some mechanical transmission systems, it is still slower compared to electronic control systems. The opening and closing of the air valve and the charging and discharging of the gas all require a certain amount of time, especially in situations that require fast and frequent start-stop or complex action switching, the pneumatic system may not be able to meet the requirements of fast response, affecting production efficiency and work quality.

[0011] 6. High processing cost: The traditional gun changing disc structure is complex and precise, which is time-consuming and laborious to process, requires high machining capacity and high cost.

[0012] Therefore, it is particularly important to design a quick change disc with low motion noise, high energy efficiency, low air quality requirements, fast response, low cost and energy saving. SUMMARY

[0013] The purpose of the present application is to overcome the shortcomings of the prior art and provide a robot electric permanent magnet end quick change device.

[0014] In order to achieve the above purpose, the robot electric permanent magnet end quick change device of the present application is as follows:

[0015] The robot electric permanent magnet end quick change device, its main feature is that the device includes: R side main disc assembly and T side main disc assembly, the two are clamped and connected, and the R side main disc assembly is installed at the end of the robot arm, and the T side main disc assembly is installed on the tool or equipment that needs to be quickly changed;

[0016] Wherein, several magnetic conductive structures are arranged at the bottom of the R-side shell, and a cross-shaped lock catch is arranged at the center of the bottom, the magnetic conductive structures and the magnetic conductive material arranged on the cross-shaped lock catch are magnetically interacted, and the locking or loosening between the R-side main disc assembly and the T-side main disc assembly is realized by changing the engagement state of the cross-shaped lock catch.

[0017] Preferably, a groove is arranged on the cross-shaped lock catch, the groove is used for engaging or loosening the lock hook arranged on the T-side main disc assembly, and the groove corresponds to the arrangement position and number of the lock hook.

[0018] Preferably, several guide pins are arranged at the bottom of the R-side main disc assembly, the guide pins are fixedly arranged on the silica gel pad, and the arrangement position and number of the guide pins correspond to the pin sleeve arranged on the T-side main disc assembly, and the guide pins and the pin sleeve are mutually butted through precise positioning.

[0019] Preferably, the magnetic conductive structure comprises a wire winding framework, a lacquered copper coil is arranged on the wire winding framework, an aluminum-nickel-cobalt alloy is arranged in the lacquered copper coil, and samarium-cobalt alloys are arranged at the extension ends of the cross-shaped lock catch, the engagement state of the cross-shaped lock catch and the lock hook is controlled by changing the current attribute of the lacquered copper coil.

[0020] Preferably, when the lacquered copper coil is introduced into a forward current, the aluminum-nickel-cobalt alloy and the samarium-cobalt alloy are magnetically opposite and thus attract each other, the cross-shaped lock catch is subjected to a forward thrust and occurs forward deflection, the lock hook is closed, and a locking state is reached.

[0021] When the lacquered copper coil is introduced into a reverse current, the aluminum-nickel-cobalt alloy and the samarium-cobalt alloy are magnetically same and thus repel each other, the cross-shaped lock catch is subjected to a reverse repulsion and occurs reverse deflection, the cross-shaped lock catch and the lock hook are separated, and a loosening state is reached.

[0022] Preferably, a silicon steel magnetic conductive plate is further arranged between the aluminum-nickel-cobalt alloy and the samarium-cobalt alloy, and the silicon steel magnetic conductive plate is used for improving the attraction force between the aluminum-nickel-cobalt alloy and the samarium-cobalt alloy.

[0023] Preferably, a Hall sensor is arranged at the outer edge position of the R-side shell, when the built-in magnet of the lock hook reaches a locking position and is sensed by the Hall sensor on the left side, a green light is lit, and a current acquired locking signal is fed back to the robot through PLC, and the robot is allowed to act; when the built-in magnet of the lock hook reaches a loosening position and is sensed by the Hall sensor on the right side, a red light is lit, and a current acquired loosening signal is fed back to the robot through PLC, and the robot is allowed to replace another T-side main disc assembly.

[0024] Preferably, the upper side of the R-side shell is provided with an R-side cover plate for sealing the R-side shell, and a spring buffering device is arranged between the R-side cover plate and the top flange, which is used to reduce the impact force when the R-side main disc assembly and the T-side main disc assembly are docked.

[0025] The robot electric permanent magnet end quick change device has the advantages that: since the electric permanent magnet quick change is based on the principle of generating magnetism by electricity, the movement noise is small, the air quality is not required, the structure is simple, the cost is low, the response is fast, and the energy consumption is tiny since only electricity is needed in the loosening and locking states, and the self-locking force and the loosening force are provided by the permanent magnet in the rest time; on this basis, the buffer device and the rubber pad can relieve the impact force when the R-side and the T-side are docked, thereby increasing the service life of the quick change disc, and the Hall sensor can transmit the locking and loosening signals in real time, thereby preventing the problem of artificial misoperation. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is a schematic view of the docking of the R-side main disc assembly and the T-side main disc assembly.

[0027] Figure 2 It is a structural schematic view of the R-side main disc assembly.

[0028] Figure 3 It is a structural schematic view of the T-side main disc assembly.

[0029] Figure 4 It is a sectional view of the R-side main disc assembly and the T-side main disc assembly after docking.

[0030] Figure 5 It is a principle view of the robot electric permanent magnet end quick change device in the locking state.

[0031] Figure 6 It is a schematic view of the internal structure of the robot electric permanent magnet end quick change device in the locking state.

[0032] Figure 7 It is a principle view of the robot electric permanent magnet end quick change device in the loosening state.

[0033] Figure 8 It is a schematic view of the internal structure of the robot electric permanent magnet end quick change device in the loosening state.

[0034] Figure 9 It is a schematic view of the robot electric permanent magnet end quick change device in the combined state.

[0035] REFERENCE NUMERALS

[0036] 1 R side main plate assembly

[0037] 1-1 guide screw

[0038] 1-2 top end flange

[0039] 1-3 spring buffer device

[0040] 1-4 R side cover plate

[0041] 1-5 enameled copper coil

[0042] 1-6 winding skeleton

[0043] 1-7 alnico alloy

[0044] 1-8 silicon steel magnetic conducting plate

[0045] 1-9 samarium cobalt alloy

[0046] 1-10 cross lock

[0047] 1-11 guide pin

[0048] 1-12 silica gel pad

[0049] 1-13 R side shell

[0050] 1-14 hall sensor

[0051] 2 T side main plate assembly

[0052] 2-1 lock hook

[0053] 2-2 pin sleeve

[0054] 2-3 T side shell DETAILED DESCRIPTION

[0055] In order to enable a more clear description of the technical content of the present application, further description will be made in combination with specific embodiments.

[0056] Before the detailed description of embodiments according to the present application, it should be noted that in the following, the terms “comprise”, “contain” or any other variant are intended to cover non-exclusive inclusion, thereby enabling a process, method, article or device comprising a series of elements to not only include these elements, but also include other elements not explicitly listed or inherent to such a process, method, article or device.

[0057] The core of the technical solution is that the R side main plate and the T side main plate are locked and loosened through the principle of attracting each other by opposite poles and repelling each other by the same poles.

[0058] AsFigures 1 to 4 And 9 shown, the robot electric permanent magnet end quick changer, wherein the device comprises: R side main plate assembly 1 and T side main plate assembly 2, two carding docking, and the R side main plate assembly 1 is installed on the robot arm end, and the T side main plate assembly 2 is installed on the tool or equipment needing to be quickly replaced;

[0059] Wherein, a plurality of magnetic conductive structures are arranged at the bottom of the R side shell 1-13, and a cross lock catch 1-10 is arranged at the center position of the bottom, the magnetic conductive structure and the magnetic conductive material arranged on the cross lock catch 1-10 are magnetically interacted, the locking or loosening between the R side main plate assembly 1 and the T side main plate assembly 2 is realized by changing the clamping state of the cross lock catch 1-10.

[0060] As a preferred embodiment of the application, the cross lock catch 1-10 is provided with a groove, the groove is used for clamping or loosening the lock hook 2-1 arranged on the T side main plate assembly 2, and the groove corresponds to the arrangement position and number of the lock hook 2-1.

[0061] As a preferred embodiment of the application, the R side main plate assembly 1 is provided with a plurality of guide pins 1-11 at the bottom, the guide pins 1-11 are fixedly arranged on the silica gel pad 1-12, and the arrangement position and number of the guide pins 1-11 correspond to the pin sleeve 2-2 arranged on the T side main plate assembly 2, the guide pins 1-11 and the pin sleeve 2-2 are mutually docked through precise positioning.

[0062] As a preferred embodiment of the application, the magnetic conductive structure comprises a wire winding framework 1-6, the wire winding framework 1-6 is provided with an enameled copper coil 1-5, the enameled copper coil 1-5 is wrapped with an aluminum-nickel-cobalt alloy 1-7, and the cross lock catch 1-10 is provided with a samarium-cobalt alloy 1-9 at the extension end, the clamping state of the cross lock catch 1-10 and the lock hook 2-1 is controlled by changing the current property of the enameled copper coil 1-5.

[0063] As a preferred embodiment of the application, when the enameled copper coil 1-5 introduces a forward current, the aluminum-nickel-cobalt alloy 1-7 and the samarium-cobalt alloy 1-9 are magnetically opposite and thus attract each other, so that the cross lock catch 1-10 is subjected to a forward thrust and occurs a forward deflection, the lock hook 2-1 is closed with the cross lock catch 1-10, and a locking state is reached.

[0064] When the enameled copper coil 1-5 introduces a reverse current, the aluminum-nickel-cobalt alloy 1-7 and the samarium-cobalt alloy 1-9 are magnetically same and thus repel each other, the cross lock catch 1-10 is subjected to a reverse repulsion force and occurs a reverse deflection, so that the cross lock catch 1-10 is separated from the lock hook 2-1, and a loosening state is reached.

[0065] As a preferred embodiment of the present application, a silicon steel magnetic conductive plate 1-8 is arranged between the Al-Ni-Co alloy 1-7 and the Sm-Co alloy 1-9, which is used to improve the attraction force between the Al-Ni-Co alloy 1-7 and the Sm-Co alloy 1-9.

[0066] As a preferred embodiment of the present application, a Hall sensor 1-14 is arranged at the outer edge of the R-side shell 1-13. When the Hall sensor 1-14 on the left side senses that the built-in magnet of the lock hook 2-1 reaches the locking position, a green light is lit, and the current locking signal is fed back to the robot through PLC, allowing the robot to act; when the Hall sensor 1-14 on the right side senses that the built-in magnet of the lock hook 2-1 reaches the loosening position, a red light is lit, and the current loosening signal is fed back to the robot through PLC, allowing the robot to replace another T-side main disc assembly 2.

[0067] As a preferred embodiment of the present application, an R-side cover plate 1-4 is mounted on the upper side of the R-side shell 1-13, which is used to seal the R-side shell 1-13, and a spring buffer device 1-3 is arranged between the R-side cover plate 1-4 and the top flange 1-2, which is used to reduce the impact force when the R-side main disc assembly 1 and the T-side main disc assembly 2 are docked; and a guide screw 1-1 is also mounted on the top flange 1-2.

[0068] The working principle of the technical solution will be described in further detail as follows:

[0069] Please refer to Figures 5 to 6 As shown in the figure, when the robot approaches the target tool, the guide pin 1-11 of the R-side main disc assembly 1 and the pin sleeve 2-2 of the T-side main disc assembly 2 are docked through precise positioning. In order to prevent hard connection when the R-side and the T-side are docked, the spring buffer device 1-3 and the silica gel pad 1-12 are added to reduce the impact force when the R-side and the T-side are docked, thereby increasing the service life of the quick change disc. At the same time, the lock hook 2-1 of the T-side main disc assembly 2 enters the R-side main disc assembly 1, at which time a positive current is passed through the enameled copper coil 1-5 in the electric permanent magnet quick change device (for example, 1-2V / 1A), and the coil generates a magnetic field, which is attracted to the permanent magnet of the T-side main disc assembly 2, thereby achieving the function of quick change. Figure 5As shown, on the outer side of the winding framework 1-6, there is a magnetic mark for indicating the current internal magnetic field direction. Due to the current magnetic effect, the enameled copper coil 1-5 generates a large enough positive magnetic field. The aluminum-nickel-cobalt alloy 1-7 wrapped in the enameled copper coil 1-5 changes its polarity due to its low coercive force. The surface opposite to the samarium-cobalt alloy 1-9 (low coercive force and high temperature resistance) shows S polarity, and the samarium-cobalt alloy 1-9 shows N polarity. At this time, the polarities of the two magnets opposite to each other are opposite, and the samarium-cobalt alloy 1-9 and the aluminum-nickel-cobalt alloy 1-7 attract each other. On this basis, the soft magnetic material silicon steel magnetic conducting plate 1-8 is added between the samarium-cobalt alloy 1-9 and the aluminum-nickel-cobalt alloy 1-7 to optimize the magnetic field distribution and improve the attraction force. At this time, the cross-shaped lock buckle 1-10 in the R-side main disc assembly 1 is positively deflected under the action of the positive thrust, and the lock hook 2-1 of the T-side main disc assembly 2 is closed to each other, reaching the locked state (as shown in Figure 5 As shown, the cross-shaped lock buckle rotation direction mark is arranged at the center of the cross-shaped lock buckle 1-10, which is used to indicate the current force direction of the cross-shaped lock buckle 1-10. At this time, the left side of the outer side Hall sensor 1-14 senses that the built-in magnet of the lock hook 2-1 approaches the locked position, and the green light is on. The locking signal is fed back to the robot through the PLC, allowing the robot to move.

[0070] Please refer to Figures 7 to 8 As shown, when the robot needs to change the gun, the enameled copper coil 1-5 in the electric permanent magnet quick-change device is supplied with a reverse current (as shown in Figure 7 As shown, on the outer side of the winding framework 1-6 and the magnetic conducting material of the cross-shaped lock buckle 1-10, there is a magnetic mark for indicating the current internal magnetic field direction. The enameled copper coil 1-5 generates a large enough reverse magnetic field. The aluminum-nickel-cobalt alloy 1-7 wrapped in the enameled copper coil 1-5 changes its polarity due to its low coercive force. The surface opposite to the samarium-cobalt alloy 1-9 shows N polarity, and the surface opposite to the aluminum-nickel-cobalt alloy 1-7 also shows N polarity. At this time, the polarities of the two magnets opposite to each other are the same, and the samarium-cobalt alloy 1-9 and the aluminum-nickel-cobalt alloy 1-7 repel each other. At this time, the cross-shaped lock buckle 1-10 in the R-side main disc assembly 1 is reversely deflected under the action of the reverse thrust, and the lock hook 2-1 of the T-side main disc assembly 2 is loosened to each other, reaching the loosened state. At this time, the right side of the outer side Hall sensor 1-14 senses that the built-in magnet of the lock hook 2-1 approaches the loosened position and the red light is on. The loosening signal is fed back to the robot through the PLC, allowing the robot to change another T-side disc.

[0071] It should be understood that parts of the present application can be realized by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, a plurality of steps or methods can be realized by software or firmware stored in a memory and executed by a suitable instruction execution device.

[0072] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "embodiments" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the specification, the illustrative description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0073] Although the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are exemplary and are not to be construed as limiting the present application, and those of ordinary skill in the art can make changes, modifications, replacements and variations to the above-described embodiments within the scope of the present application.

[0074] The robot electric permanent magnet end fast-changing device adopting the present application has small movement noise, no requirement for air quality, simple structure, low cost, fast response, and only needs electric energy in the loosening and locking state, and the rest of the time is through permanent magnet to provide self-locking force and loosening force, so the energy consumption is minimal. On this basis, the added buffer device and rubber pad can relieve the impact force when the R side and the T side are docked, thereby increasing the service life of the fast-changing disc, and the use of the Hall sensor can also transmit the locking and loosening signals in real time, thereby preventing the problem of human error operation.

[0075] In this specification, the present application has been described with reference to its specific embodiments. However, it is obvious that various modifications and changes can be made without departing from the spirit and scope of the present application. Therefore, the specification and drawings should be considered as illustrative rather than limiting.

Claims

1. A robot electric permanent magnet end effector quick change device, characterized in that, The device comprises an R-side main disc assembly (1) and a T-side main disc assembly (2), which are clamped and docked, and the R-side main disc assembly (1) is installed at the end of a robot arm, and the T-side main disc assembly (2) is installed on a tool or equipment that needs to be quickly replaced; A plurality of magnetic conduction structures are arranged at the bottom of the R-side shell (1-13), and a cross-shaped lock catch (1-10) is arranged at the center of the bottom, the magnetic conduction structures and the magnetic conduction material arranged on the cross-shaped lock catch (1-10) are magnetically interacted, the locking or loosening between the R-side main disc assembly (1) and the T-side main disc assembly (2) is realized by changing the clamping state of the cross-shaped lock catch (1-10). The cross-shaped lock catch (1-10) is provided with a groove, the groove is used for clamping or loosening the lock hook (2-1) arranged on the T-side main disc assembly (2), and the groove corresponds to the arrangement position and number of the lock hook (2-1). The magnetic conduction structure comprises a wire winding framework (1-6), and a lacquered copper coil (1-5) is arranged on the wire winding framework (1-6), the lacquered copper coil (1-5) is wrapped with an aluminum-nickel-cobalt alloy (1-7), and the cross-shaped lock catch (1-10) is provided with a samarium-cobalt alloy (1-9) at the extending end, the clamping state of the cross-shaped lock catch (1-10) and the lock hook (2-1) is controlled by changing the current property of the lacquered copper coil (1-5). When the lacquered copper coil (1-5) introduces a forward current, the aluminum-nickel-cobalt alloy (1-7) and the samarium-cobalt alloy (1-9) are magnetically opposite and thus attract each other, so that the cross-shaped lock catch (1-10) is subjected to a forward thrust and is positively deflected, and the lock hook (2-1) is closed, so that the locking state is achieved. When the lacquered copper coil (1-5) introduces a reverse current, the aluminum-nickel-cobalt alloy (1-7) and the samarium-cobalt alloy (1-9) are magnetically the same and thus repel each other, the cross-shaped lock catch (1-10) is subjected to a reverse repulsion force and is reversely deflected, so that the cross-shaped lock catch (1-10) is separated from the lock hook (2-1), and the loosening state is achieved.

2. The robotic electrically powered permanent magnetically charged end effector quick change device of claim 1, wherein, The R-side main disc assembly (1) is provided with a plurality of guide pins (1-11) at the bottom, the guide pins (1-11) are fixedly arranged on a silica gel pad (1-12), and the arrangement position and number of the guide pins (1-11) correspond to the pin sleeve (2-2) arranged on the T-side main disc assembly (2), and the guide pins (1-11) and the pin sleeve (2-2) are docked through precise positioning.

3. The robotic electrically powered permanent magnetically charged end effector quick change device of claim 1, wherein, A silicon steel magnetic conduction plate (1-8) is further arranged between the aluminum-nickel-cobalt alloy (1-7) and the samarium-cobalt alloy (1-9), and the silicon steel magnetic conduction plate (1-8) is used to improve the attraction force between the aluminum-nickel-cobalt alloy (1-7) and the samarium-cobalt alloy (1-9).

4. The robotic electrically powered permanent magnetically charged end effector quick change device of claim 1, wherein, The Hall sensor (1-14) is arranged at the outer side edge position of the R-side shell (1-13), when the Hall sensor (1-14) on the left side senses that the built-in magnet of the lock hook (2-1) reaches the locking position, a green light is lit, and the current obtained locking signal is fed back to the robot through PLC, allowing the robot to act; when the Hall sensor (1-14) on the right side senses that the built-in magnet of the lock hook (2-1) reaches the loosening position, a red light is lit, and the current obtained loosening signal is fed back to the robot through PLC, allowing the robot to replace another T-side main disc assembly (2).

5. The robotic electrically powered permanent magnetically charged end effector quick change device of claim 1, wherein, The R-side cover plate (1-4) is arranged on the upper side of the R-side shell (1-13) and is used for sealing the R-side shell (1-13), and a spring buffering device (1-3) is further arranged between the R-side cover plate (1-4) and the top flange (1-2), the spring buffering device (1-3) is used for reducing the impact force when the R-side main disc assembly (1) and the T-side main disc assembly (2) are docked; and the guide screw (1-1) is further arranged on the top flange (1-2).

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