Side plate fixing device and welding jig thereof
By combining the side plate fixing device with the bracket main body and adsorption device with the fixed shaft, the problem of unstable side plates during the welding of the ring cabinet air chamber is solved, and the automatic fixation of the side plates is realized, which improves the positioning accuracy and the production quality of the ring cabinet air chamber.
Patent Information
- Application Number
- CN202422360834.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-26
- Publication Date
- 2025-08-29
- Estimated Expiration
- 2034-09-26
AI Technical Summary
In the prior art, the side plates of the ring cabinet gas chamber lack stable support during welding, resulting in low positioning accuracy and affecting the production pass rate of the ring cabinet gas chamber.
The side plate fixing device is used to combine the side plate fixing device with the fixed shaft. The side plate is adsorbed through the adsorption device and provided vertical support with the fixed shaft to achieve automatic fixation of the side plate and avoid manual support during welding.
The fixing effect and positioning accuracy of the side panels are improved, and the production pass rate of the air chamber of the ring network cabinet is improved.
Smart Images

Figure CN223277433U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the field of assembly welding, and in particular relates to a side plate fixing device and a welding jig thereof. Background Art
[0002] Ring main units (RMUs) are widely used electrical equipment. The RMU air chamber is a crucial component, providing important functions such as protecting cables. During the RMU air chamber production process, the panels must first be assembled and fixed, and then the assembled panels must be welded. Currently, the RMU air chamber is assembled by manually supporting and positioning the panels before welding.
[0003] The side panels are integral to the ring main unit's air chamber. Without support, they would fall sideways under gravity during welding. Therefore, the existing solution requires manual support of the side panels during welding. This unstable support can cause slight movement, resulting in poor fixing and reduced positioning accuracy, leading to a low pass rate for the ring main unit's air chamber. Utility Model Content
[0004] The embodiment of the utility model provides a side plate fixing device and a welding jig thereof, which can improve the fixing effect of the ring network cabinet air chamber, improve the positioning accuracy, and improve the qualified rate of the produced ring network cabinet air chamber.
[0005] In a first aspect, an embodiment of the present invention provides a side plate fixing device of a welding jig, wherein the welding jig is used to weld a ring network cabinet air chamber, wherein the ring network cabinet air chamber includes a side plate, and the side plate is provided with at least two through holes. The side plate fixing device of the welding jig includes:
[0006] Bracket body;
[0007] An adsorption device, the adsorption device is installed in the bracket body, and the adsorption device is used to adsorb the side panel;
[0008] At least two fixed shafts are installed in the bracket body, and the fixed shafts can pass through the through holes.
[0009] According to some embodiments of the present invention, the bracket body includes a bottom frame and a side frame, and the side frame is vertically fixed to the front edge of the bottom frame.
[0010] According to some embodiments of the present invention, the present invention further includes:
[0011] A limiting rod is fixedly mounted on the upper side of the bottom frame, and a front end of the limiting rod protrudes from the front end of the bracket body.
[0012] According to some embodiments of the present invention, the present invention further includes:
[0013] a first panel, the first panel being mounted in the bracket body, the first panel being provided with at least two adsorption devices, the adsorption devices being used to adsorb the side panels;
[0014] The second panel is installed in the bracket body, the second panel is provided with at least two through holes, and the second panel is provided with at least two fixed shafts, and the fixed shafts can be passed through the through holes.
[0015] According to some embodiments of the present invention, the adsorption device includes a base, an air pipe and a suction cup, the base is fixedly connected to the first panel, the suction cup is flush with the outer side of the bracket body, and the air pipe is connected to the suction cup.
[0016] According to some embodiments of the present invention, the fixed shaft includes a first column and a second column, the first column is sleeved outside the second column, and the second column is retractable.
[0017] According to some embodiments of the present invention, the present invention further includes:
[0018] The first cylinder and the second cylinder are installed in the bracket body, the first cylinder is connected to the adsorption device, the first cylinder is connected to the air pipe, the second cylinder is connected to the second column, and the second cylinder is used to drive the second column to move back and forth within the first column.
[0019] According to some embodiments of the present invention, a trigger device is provided on the front side of the front frame, and the trigger device is electrically connected to the first cylinder and the second cylinder respectively.
[0020] In a second aspect, an embodiment of the present invention further provides a welding jig, comprising the side plate fixing device as described in the first aspect.
[0021] The embodiment of the present utility model includes: a bracket body; at least two fixed shafts, the fixed shafts being installed in the bracket body and being able to pass through the through holes; an adsorption device, the adsorption device being installed in the bracket body and being used to adsorb the side panels. According to the technical solution of this embodiment, the through holes of the side panels are limited by the fixed shafts, which can provide positioning when the side panels are installed, and after installation, the fixed shafts provide vertical support to achieve preliminary positioning. The side panels can be fixed by the adsorption device so that they will not fall under the action of gravity, and the side panels can be automatically fixed before welding. Manual fixing is not required during welding, which improves the fixing effect, thereby improving the positioning accuracy and the qualified rate of the ring network cabinet air chamber. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Figure 1 This is a schematic structural diagram of a side panel fixing device provided by an embodiment of the present utility model;
[0023] Figure 2 This is a structural diagram of a side panel fixing device after fixing the side panel provided by an embodiment of the present invention;
[0024] Figure 3 This is a right side view of a side panel fixing device provided by one embodiment of the present utility model;
[0025] Figure 4 It is a structural diagram of an adsorption device provided in another embodiment of the present utility model. DETAILED DESCRIPTION
[0026] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.
[0027] It should be noted that although the device schematics illustrate functional module divisions and the flowcharts illustrate logical sequences, in certain circumstances, the steps shown or described may be performed in a sequence that differs from the module divisions in the device or the sequence in the flowcharts. The terms "first," "objective," and the like in the specification, claims, or accompanying drawings are used to distinguish similar objects and are not necessarily intended to describe a specific sequence or precedence.
[0028] The embodiment of the present utility model includes: a bracket body; at least two fixed shafts, the fixed shafts being installed in the bracket body and being able to pass through the through holes; an adsorption device, the adsorption device being installed in the bracket body and being used to adsorb the side panels. According to the technical solution of this embodiment, the through holes of the side panels are limited by the fixed shafts, which can provide positioning when the side panels are installed, and after installation, the fixed shafts provide vertical support to achieve preliminary positioning. The side panels can be fixed by the adsorption device so that they will not fall under the action of gravity, and the side panels can be automatically fixed before welding. Manual fixing is not required during welding, which improves the fixing effect, thereby improving the positioning accuracy and the qualified rate of the ring network cabinet air chamber.
[0029] Reference Figure 1 and Figure 2 The present embodiment provides a side plate fixing device for a welding jig. The welding jig is used for welding a ring main unit air chamber. The ring main unit air chamber includes a side plate 10. The side plate 10 is provided with at least two through holes. The side plate fixing device for the welding jig provided in the present embodiment includes:
[0030] Bracket body 20;
[0031] The adsorption device 30 is installed in the bracket body 20 and is used to adsorb the side panel 10;
[0032] At least two fixed shafts 40 are installed in the bracket body 20 , and the fixed shafts 40 can pass through the through holes.
[0033] It should be noted that the bracket body 20 is a frame structure of a welding jig. The side panel fixing device provided in this embodiment is to fix the side panel 10 on the front side of the bracket body 20. The bracket body 20 can also be used to set the structure of fixing the panels in other directions of the ring network cabinet air chamber. This embodiment only improves the fixation of the side panel 10 and does not involve improvements to the panel fixing structure in other directions.
[0034] It should be noted that the suction device 30 is installed in the bracket body 20 and is used to suck the side panel 10. Because the side panel 10 is fixed to the front side of the bracket body 20, the suction portion of the suction device 30 needs to face the front side of the bracket body 20. When the side panel 10 is flush with the front side of the bracket body 20, the suction device 30 can properly suck the side panel 10, ensuring that the side panel 10 is installed in place and can fix the side panel 10 through suction.
[0035] Exemplarily, the suction device 30 may be a vacuum suction device comprising a suction cup, the surface of which forms a sealed area with the installed side panel 10. Once the side panel 10 is installed, the vacuum suction device begins to secure the side panel 10. The vacuum suction device extracts air from the sealed area formed between the suction cup and the side panel 10. After the air is evacuated, the area becomes vacuum-free. Under the action of negative pressure, the side panel 10 is adsorbed onto the vacuum suction device, securing the side panel 10.
[0036] Exemplarily, the adsorption device 30 may be an electromagnetic adsorption device including a magnetic pole. When the side panel 10 is installed, the electromagnetic adsorption device begins to secure the side panel 10. The magnetic pole generates a magnetic force, thereby adsorbing the side panel 10. Under the action of the magnetic force, the electromagnetic adsorption device can secure the side panel 10.
[0037] It should be noted that the side panel fixing device provided in this embodiment is applied to the air chamber of a ring main unit (RMU), which includes a side panel 10. During the production process of the RMU air chamber, other parts need to be installed in the already welded RMU air chamber. Therefore, the side panel 10 of the RMU air chamber is usually provided with through holes. This embodiment does not involve structural improvements to the side panel 10, but rather utilizes the existing through-hole structure of the side panel 10 as auxiliary holes for fixing.
[0038] It should be noted that the fixed shaft 40 is installed in the bracket body 20 and can be inserted into the through hole of the side plate 10. The front end of the fixed shaft 40 can protrude from the front end of the bracket body 20 or can be completely located in the bracket body 20. The fixed shaft 40 can be a solid shaft or a hollow shaft.
[0039] For example, the fixed shaft 40 can be a solid shaft with its front end protruding from the front end of the bracket body 20. When installing the side panel 10, align the through-hole of the side panel 10 with the fixed shaft 40. During the installation process, ensure that the fixed shaft 40 is inserted into the through-hole of the side panel 10. If the front end of the fixed shaft 40 protrudes from the front end of the bracket body 20, it can serve as a positioning tool before the side panel 10 is fixed.
[0040] For example, the fixed shaft 40 can be a retractable hollow shaft. Before the side panel 10 is installed, the fixed shaft 40 is completely located in the bracket body 20. After the side panel 10 is installed, the fixed shaft 40 moves forward and passes through the through hole of the side panel 10, providing vertical support for the side panel 10 and securing the side panel 10 to prevent rotation and movement. The retractable fixed shaft 40 allows the side panel fixing device of this embodiment to be adapted for side panels 10 of varying thicknesses.
[0041] In addition, in one embodiment, referring to Figure 1 and Figure 2 The bracket body 20 includes a bottom frame 21 and a side frame 22 , and the side frame 22 is vertically fixed to the front edge of the bottom frame 21 .
[0042] It should be noted that the bracket body 20 includes a bottom frame 21 and a side frame 22. The bracket body 20 includes multiple support rods, which can facilitate installation and subsequent maintenance.
[0043] It should be noted that the bottom frame 21 is parallel to the ground, the side frame 22 is vertically fixed to the front edge of the bottom frame 21, and the side panel 10 is fixed to the front side of the bracket body 20, that is, after the side panel fixing device fixes the side panel 10, the side panel 10 is perpendicular to the bottom frame 21.
[0044] It should be noted that the side panel 10 is fixed to the front side of the bracket body 20, that is, when the side panel 10 is flush with the side frame 22, the side panel fixing device fixes the side panel 10 to the front side of the side frame 22 through the adsorption device 30 and the fixed shaft 40, and the side frame 22 will not hinder the subsequent welding steps of the side panel 10.
[0045] In addition, in one embodiment, referring to Figure 1 and 3 , also includes:
[0046] The limiting rod 70 is fixedly mounted on the upper side of the bottom frame 21 , and the front end of the limiting rod 70 protrudes from the front end of the bracket body 20 .
[0047] It should be noted that the front end of the limit rod 70 protrudes from the front end of the bracket body 20 and provides a limit for the lower end of the side panel 10 during installation. When the lower end of the side panel 10 contacts the limit rod 70, the installer can determine that the height of the side panel 10 is in place and the limit rod 70 restricts the downward movement of the side panel 10. The limit rod 70 limits the vertical position of the side panel 10 and plays a positioning role in fixing the side panel 10 to the bracket body 20.
[0048] In addition, in one embodiment, referring to Figure 2 , also includes:
[0049] A first panel 50 is installed in the bracket body 20. The first panel 50 is provided with at least two adsorption devices 30. The adsorption devices 30 are used to adsorb the side panels 10.
[0050] The second panel 60 is installed in the bracket body 20. The second panel 60 is provided with at least two through holes. The second panel 60 is provided with at least two fixing shafts 40. The fixing shafts 40 can pass through the through holes.
[0051] It should be noted that the first panel 50 is installed in the bracket body 20, and the first panel 50 is provided with at least two adsorption devices 30, and the first panel 50 is parallel to the side frame 22, so that the adsorption device 30 provided on the first panel 50 can provide suction perpendicular to the side panel 10 for the side panel 10, thereby making the adsorption effect better.
[0052] It should be noted that the first panel 50 is provided with at least two suction devices 30 to provide more force points for securing the side panels 10 and to ensure a balanced suction force on the side panels 10, thereby preventing the side panels 10 from shifting after the suction devices 30 are activated. During implementation, the number and position of the suction devices 30 can be adjusted adaptively based on actual conditions.
[0053] It should be noted that the second panel 60 is mounted within the bracket body 20 and is provided with at least two through-holes. The second panel 60 is also provided with at least two fixing shafts 40, which can be inserted through the through-holes. Before the side panels 10 are secured, the fixing shafts 40 can be completely located within the bracket body 20 or protrude from the front end of the bracket body 20. The second panel 60 is parallel to the side frame 22, allowing the fixing shafts 40 to extend perpendicularly to the side panels 10 and directly insert into the through-holes of the side panels 10.
[0054] In addition, in one embodiment, referring to Figure 2 and Figure 4The adsorption device 30 includes a base 31, an air pipe 33 and a suction cup 32. The base 31 is fixedly connected to the first panel 50. The air pipe 33 and the suction cup 32 are fixedly connected to the base 31. The suction cup 32 is flush with the front side of the bracket body 20, and the air pipe 33 is connected to the suction cup 32.
[0055] It should be noted that the base 31 is fixedly connected to the first panel 50, and the air pipe 33 and suction cup 32 are fixedly connected to the base 31. The air pipe 33 can be fixedly connected to the rear end of the base 31, and the suction cup 32 can be fixedly connected to the front end of the base 31. The air pipe 33 does not hinder the suction cup 32 from forming a sealed space with the installed side panel 10. The air pipe 33 fixedly connected to the rear end of the base 31 is as close to the base 31 as possible, shortening the distance between the air pipe 33 and the suction cup 32, improving suction efficiency, and reducing the power required to operate the suction device 30.
[0056] It should be noted that the side panel 10 is flush with the front side of the bracket body 20, which means that the side panel 10 is fully installed. Since the suction cup 32 is flush with the front side of the bracket body 20, that is, after the side panel 10 is fully installed, the suction cup 32 abuts against the side panel 10, forming a sealed area with the side panel 10.
[0057] It should be noted that the air pipe 33 is connected to the suction cup 32 so that the air pipe 33 can be connected to the area between the suction cup 32 and the side plate 10, thereby preparing for the subsequent operation of the adsorption device 30.
[0058] In addition, in one embodiment, referring to Figure 1 and Figure 3 The fixed shaft 40 includes a first column 41 and a second column 42. The first column 41 is sleeved outside the second column 42, and the second column 42 is retractable.
[0059] It should be noted that the first column 41 is fixedly connected to the second panel 60, protrudes from the front end of the bracket body 20, and is sleeved on the outside of the second column 42, and the second column 42 is retractable. When the side panel 10 is installed in place, the first column 41 has been inserted into the through hole of the side panel 10. After the first column 41 is inserted into the through hole of the side panel 10, the second column 42 moves forward. The inner side of the first column 41 is the telescopic path of the second column 42, ensuring that the second column 42 is coaxial with the first column 41 and remains on the inner side of the through hole after the second column 42 is extended.
[0060] It should be noted that the fixed shaft 40 includes a first column 41 and a second column 42. The first column 41 is sleeved outside the second column 42. The second column 42 is retractable. The first column 41 is a hollow column, and the second column 42 can be a solid shaft or a hollow shaft.
[0061] For example, when installing the side panel 10, after aligning the through-hole of the side panel 10 with the first column 41, the through-hole of the side panel 10 is inserted into the outer wall of the first column 41. The first column 41 provides a vertical support force for the installation of the side panel 10 and serves to position the side panel 10 during installation. The first column 41 works together with the limiting rod 70 to position the side panel 10 during installation. The second column 42 can be extended and retracted within the first column 41. When the side panel 10 is installed, the second column 42 extends from the first column 41, thereby supporting the side panel 10.
[0062] It should be noted that the retractable second column 42 enables the side panel fixing device of this embodiment to be used to fix side panels 10 of varying thicknesses. The retractable fixing shaft 40 is adaptable to side panels 10 of varying thicknesses, preventing the fixed-length fixing shaft 40 from extending too far when the side panel 10 is thin, thereby hindering welding, and from extending insufficiently when the side panel 10 is thick, resulting in insufficient support for the side panel 10.
[0063] It should be noted that the side panel fixing device includes at least two fixing shafts 40 , that is, the side panel fixing device includes at least two telescopic second columns 42 .
[0064] For example, the two second columns 42 can be vertically fixedly connected to the same movable rod, and the second column 42 can be extended and retracted in the first column 41 by moving the movable rod back and forth, so that the two second columns 42 can be controlled by only controlling the movable rod.
[0065] In addition, in one embodiment, referring to Figures 1 to 3 , also includes:
[0066] The first cylinder and the second cylinder are installed in the bracket body 20, the first cylinder is connected to the adsorption device 30, the first cylinder is connected to the air pipe 33, and the second cylinder is connected to the second column 42. The second cylinder is used to drive the second column 42 to move back and forth in the first column 41.
[0067] It should be noted that the first cylinder is connected to the adsorption device 30, and the first cylinder is connected to the air pipe 33. When the first cylinder starts to work, the first cylinder extracts the air from the sealing area between the suction cup 32 and the side panel 10 through the air pipe 33, so that a vacuum area is formed between the suction cup 32 and the side panel 10. Under the action of negative pressure, the suction cup 32 sucks the side panel 10 tightly, and the adsorption device 30 can fix the side panel 10.
[0068] It should be noted that the second cylinder is connected to the second column 42 through a movable rod, and the second column 42 is vertically connected to the movable rod. When the second cylinder starts working, it provides power for the second column 42 to move forward and backward in the first column 41. The second cylinder realizes the extension and retraction of the second column 42 in the first column 41 by moving the movable rod forward and backward.
[0069] In addition, in one embodiment, referring to Figure 1 and Figure 2 A trigger device 80 is provided on the front side of the side frame 22, and the trigger device 80 is electrically connected to the first cylinder and the second cylinder respectively.
[0070] It should be noted that the trigger device 80 is arranged on the front side of the front side frame, and the side panel 10 is fixed to the front side of the front side frame. The trigger device 80 is used to determine whether the side panel 10 is flush with the front side of the side frame 22.
[0071] It should be noted that the trigger device 80 can be a sensor, electrically connected to the first and second cylinders. When the side panel 10 is flush with the front side of the bracket body 20, the trigger device 80 generates an electrical signal under the contact pressure of the side panel 10. The trigger device 80 transmits the electrical signal to the first and second cylinders, respectively. After receiving the electrical signal, the first and second cylinders begin to operate. The first cylinder draws air through the air pipe 33 to fix the side panel 10, and the second cylinder drives the second column 42 to move forward within the first column 41.
[0072] This embodiment provides a side panel fixing device for a welding jig. The lower end of the side panel 10 is abutted against the limiting rod 70. During the installation of the side panel 10, the fixing shaft 40 is ensured to pass through the through hole of the side panel 10. When the side panel 10 is flush with the front side of the bracket body 20, the suction cup 32 of the adsorption device 30 forms a sealed area with the side panel 10. The trigger device 80 generates an electrical signal under the contact pressure of the side panel 10 and transmits the electrical signal to the first cylinder and the second cylinder electrically connected to the trigger device 80. After receiving the electrical signal, the second cylinder is activated, driving the second column 42 to move forward within the first column 41. The second column 42 provides a vertical support force for the side panel 10. After receiving the electrical signal, the first cylinder is activated, and the first cylinder draws air from the sealed area between the suction cup 32 and the side panel 10 through the air pipe 33 connected thereto. Under the action of negative pressure, the adsorption device 30 adsorbs and fixes the side panel 10. The side panel fixing device can automatically fix the side panel 10 before welding, and no manual fixation is required during the welding process, thereby improving the fixing effect, thereby improving the positioning accuracy and the qualification rate of the ring network cabinet air chamber.
[0073] In addition, the present invention also provides a welding jig, including the above Figure 2 The side panel fixing device.
[0074] It should be noted that the welding jig may include multiple side plates 10, and those skilled in the art should be able to set multiple side plate fixing devices of this embodiment on the welding jig through adaptive adjustment.
[0075] It should be noted that the welding jig can be the side panel fixing device itself, or it can be another device that uses the side panel fixing device, such as a ring main unit air chamber fixing device. This embodiment does not limit the specific type of welding jig, as long as it can be used with the above-mentioned side panel fixing device. By using the above-mentioned side panel fixing device, the welding jig can automatically fix the side panel 10 before welding, eliminating the need for manual fixing during the welding process, improving the fixing effect, thereby improving positioning accuracy and the qualified rate of the ring main unit air chamber.
[0076] Those skilled in the art will readily conceive of other embodiments of the present application after considering the specification and practicing the embodiments disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present application that follow the general principles of this application and include common knowledge or customary techniques in the art that are not disclosed herein.
[0077] It should be understood that the present application is not limited to the exact structures described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.
[0078] The above is a specific description of the preferred implementation of the present invention, but the present invention is not limited to the above implementation. Technical personnel familiar with the field can also make various equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of the present invention.
Claims
1. A side plate fixing device for a welding jig, wherein the welding jig is used for welding a ring main unit air chamber, wherein the ring main unit air chamber comprises a side plate, wherein the side plate is provided with at least two through holes, wherein: include: Bracket body; An adsorption device is installed in the bracket body and is used to adsorb the side panels; At least two fixed shafts are installed in the bracket body, and the fixed shafts can pass through the through holes.
2. The side plate fixing device of a welding jig according to claim 1, wherein the bracket body comprises a bottom frame and a side frame, and the side frame is vertically fixed to the front edge of the bottom frame.
3. The side plate fixing device of the welding jig according to claim 2, characterized in that: Also includes: A limiting rod is fixedly mounted on the upper side of the bottom frame, and a front end of the limiting rod protrudes from the front end of the bracket body.
4. The side plate fixing device of the welding jig according to claim 2, characterized in that: Also includes: a first panel, the first panel being mounted in the bracket body, the first panel being provided with at least two adsorption devices, the adsorption devices being used to adsorb the side panels; The second panel is installed in the bracket body, the second panel is provided with at least two through holes, and the second panel is provided with at least two fixed shafts, and the fixed shafts can be passed through the through holes.
5. The side plate fixing device of the welding jig according to claim 4, characterized in that: The adsorption device includes a base, an air pipe and a suction cup, the base is fixedly connected to the first panel, the air pipe and the suction cup are fixedly connected to the base, the suction cup is flush with the front side of the bracket body, and the air pipe is connected to the suction cup.
6. The side plate fixing device of the welding jig according to claim 5, characterized in that: The fixed shaft includes a first column and a second column, the first column is sleeved outside the second column, and the second column is telescopic.
7. The side plate fixing device of the welding jig according to claim 6, characterized in that: Also includes: The first cylinder and the second cylinder are installed in the bracket body, the first cylinder is connected to the adsorption device, the first cylinder is connected to the air pipe, the second cylinder is connected to the second column, and the second cylinder is used to drive the second column to move back and forth within the first column.
8. The side plate fixing device of the welding jig according to claim 7, characterized in that: A trigger device is provided on the front side of the side frame, and the trigger device is electrically connected to the first cylinder and the second cylinder respectively.
9. A welding jig, characterized in that: The side panel fixing device comprises the side panel fixing device according to any one of claims 1 to 8.