Injection position adjusting auxiliary device and die casting machine

Abstract

The invention discloses an injection position adjusting auxiliary device and a die-casting machine, and relates to the related field of die-casting technologies. The injection position adjusting auxiliary device is applied to the die-casting machine. The die-casting machine comprises a rack, a head plate and an injection driving device, the injection driving device is provided with an injection rod and a charging barrel, the head plate is provided with a plurality of injection position combination blocks, and the charging barrel is installed in an injection position formed by the injection position combination blocks; the injection driving device is used for driving the injection rod to slide along the charging barrel; the injection position adjusting auxiliary device comprises a displacement assembly and a clamping assembly, the clamping assembly clamps and fixes the injection rod, and the displacement assembly drives the clamping assembly to move so that the clamping assembly can drive the injection rod to be separated from the charging barrel. According to the technical scheme, the injection position replacement efficiency of the die-casting machine can be improved.

Description

Technical Field

[0001] The invention relates to the field related to die-casting technology, and in particular to an injection position adjustment auxiliary device and a die-casting machine. Background Art

[0002] With the progress of science and technology and industrial production, die-casting technology has achieved extremely rapid development. In the process of die-casting molding by the die-casting machine, the die-casting raw material is first filled into the barrel, and then the die-casting raw material is squeezed from the barrel into the mold under the pressure of the injection rod for die-casting. In order to match the structure of different molds, the head plate of some die-casting machines is usually equipped with several injection positions (the injection position refers to the position used to inject molten metal materials in the die-casting machine. The same die-casting machine can use different molds for production. The injection position positions corresponding to different molds are different. Therefore, the barrel should be able to be installed at multiple different positions on the head plate to adapt to different molds). Before die-casting molding, the injection rod and the barrel need to be installed to the corresponding injection position. In the prior art, since the mass of the injection rod and the barrel is as high as 100kg or even higher, it generally requires 2 to 3 people to assist in the operation, making the disassembly process more cumbersome and difficult; thus, the injection position replacement process of the die-casting machine is inefficient.

[0003] It should be noted that the above contents are only used to assist in understanding the technical solution of the present invention, and do not constitute an admission that the above contents are prior art. Summary of the invention

[0004] The main purpose of the present invention is to provide a shot position adjustment auxiliary device and a die-casting machine, aiming to improve the shot position replacement efficiency of the die-casting machine.

[0005] To achieve the above-mentioned purpose, the present invention provides an auxiliary device for adjusting the injection position, which is applied to a die-casting machine; the die-casting machine comprises a frame, a head plate and an injection driving device, wherein the injection driving device is provided with an injection rod and a barrel, the head plate is provided with a plurality of injection position assembly blocks, and the barrel is installed in an injection position formed by the injection position assembly blocks; the injection driving device is used to drive the injection rod to slide along the barrel; Specifically, the injection position adjustment auxiliary device includes a displacement assembly and a clamping assembly; more specifically, the displacement assembly and the clamping assembly are installed on a base, wherein the base is installed on a frame; the clamping assembly clamps and fixes the injection rod, and the displacement assembly drives the clamping assembly to move, so that the clamping assembly drives the injection rod to separate from the barrel.

[0006] In one embodiment, a spacer is provided between the injection rod and the injection driving device.

[0007] In one embodiment, the displacement assembly includes a lateral displacement device and at least two longitudinal displacement devices; the lateral displacement device is installed on the base, and the lateral displacement device is used to drive the injection rod to displace along its axial direction; at least two longitudinal displacement devices are installed on the lateral displacement device, and at least two longitudinal displacement devices cooperate to drive the injection rod to displace along the height direction.

[0008] In one embodiment, the lateral displacement device includes a lateral displacement driving device, a sliding seat and at least two guide rails; the lateral displacement driving device is used to drive the sliding seat to slide along the guide rails; specifically, the sliding seat is slidably connected to the base through at least two guide rails, the lateral displacement driving device is installed on the base, and the driving end of the lateral displacement driving device is connected to the sliding seat.

[0009] In one embodiment, at least two of the longitudinal displacement devices are located directly below the axis of the injection rod; each of the longitudinal displacement devices includes a lifting drive device and a rod body member, the fixed end of the lifting drive device is installed on the sliding seat, the driving end of the lifting drive device is connected to the first end of the rod body member, and the second end of the rod body member is connected to the clamping assembly.

[0010] In one embodiment, the injection position adjustment auxiliary device further includes an ejection assembly, and the ejection assembly is used to apply a force to the barrel in a direction away from the injection rod to separate the barrel and the head plate from each other.

[0011] In one embodiment, the ejection assembly includes an ejection drive device and an ejector rod, wherein the ejection drive device is installed on the side of at least two of the rod body members, and the driving end of the ejection drive device is connected to the ejector rod, wherein the axial direction of the ejector rod is parallel to the axial direction of the injection rod; under the driving action of the ejection drive device, the end of the ejector rod can move toward the barrel.

[0012] In one embodiment, the injection position adjustment auxiliary device includes a protective cover, which is wrapped around the outside of the lateral displacement device; the protective cover is provided with a sliding groove, and the sliding groove is used for the longitudinal displacement device to perform lateral displacement movement under the driving action of the lateral displacement device.

[0013] In one embodiment, the clamping assembly includes a first clamping member and a second clamping member, and a clamping area for clamping the injection rod is formed between the first clamping member and the second clamping member; the first end of the first clamping member is hinged to the first end of the second clamping member, and the second end of the first clamping member is lockably fixedly connected to the second end of the second clamping member.

[0014] In one embodiment, the first clamping member and / or the second clamping member adopts a semicircular ring structure or a V-shaped structure.

[0015] In one embodiment, a side of the first clamping member and / or the second clamping member for contacting the injection rod is provided with anti-slip textures.

[0016] To achieve the above objectives, the present invention proposes a die-casting machine, comprising an injection position adjustment auxiliary device as described in any one of the above items.

[0017] The technical solution of the present invention clamps and fixes the shot rod through the clamping assembly and drives the shot rod to move away from the barrel through the displacement assembly, so that the shot rod and the barrel are separated from each other; then, the operator installs the barrel to the shooting position corresponding to the appropriate shooting position assembly block of the head plate, and then uses the displacement assembly to reinstall the shot rod to the inside of the barrel. The above process is assisted by the device, so a single operator can complete it alone, effectively reducing the difficulty of disassembly, thereby achieving the purpose of improving the efficiency of changing the shooting position of the die-casting machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] 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 these drawings without creative work.

[0019] Figure 1 A schematic diagram of the overall structure of an embodiment of the injection position adjustment auxiliary device provided by the present invention; Figure 2 for Figure 1 A partial enlarged view of the middle A; Figure 3 A first structural schematic diagram of an embodiment of the injection position adjustment auxiliary device provided by the present invention; Figure 4 The second structural schematic diagram of an embodiment of the injection position adjustment auxiliary device provided by the present invention; Figure 5 A third structural schematic diagram of an embodiment of the injection position adjustment auxiliary device provided by the present invention; Figure 6 The fourth structural schematic diagram of an embodiment of the injection position adjustment auxiliary device provided by the present invention.

[0020] Description of reference numerals: 100, die casting machine; 110, frame; 120, injection rod; 130, barrel; 140, head plate; 150, injection drive device; 160, cushion block; 200, base; 300, displacement assembly; 310, lateral displacement device; 311, lateral displacement drive device; 312, sliding seat; 313, guide rail; 320, longitudinal displacement device; 321, lifting drive device; 322, rod body; 400, clamping assembly; 410, first clamping member; 420, second clamping member; 500, ejector assembly; 510, ejector drive device; 520, ejector rod; 600, protective cover; 610, sliding groove; 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

[0021] The following will be combined with the accompanying drawings in the present invention to clearly and completely describe the technical solution in the present invention. Obviously, what is described is only a part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0022] 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.

[0023] In addition, it should be noted that the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying 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.

[0024] In the prior art, since the mass of the injection rod and the barrel is as high as 100kg, 2 to 3 people are generally required to assist in the operation; and since the barrel is firmly installed in the injection position of the head plate, the operator needs to use tools to knock it to separate the two during disassembly, and the disassembly process is relatively cumbersome and difficult; thus, the injection position replacement process of the die-casting machine is inefficient.

[0025] In order to solve the above technical problems, the present invention proposes an auxiliary device for adjusting the injection position.

[0026] See also Figure 1-6 In one embodiment of the present invention, the injection position adjustment auxiliary device is applied to a die casting machine 100; the die casting machine 100 includes a frame 110, a head plate 140 and an injection driving device 150, wherein the injection driving device 150 is provided with an injection rod 120 and a barrel 130, wherein the head plate 140 is provided with a plurality of injection position combination blocks; it should be noted that in actual production, the plate for fixing the barrel 130 is generally referred to as the head plate 140, and there are a plurality of injection position superposition blocks of different heights (i.e. Figure 1 The stacked blocks are arranged and combined to realize different injection positions; the barrel 130 is installed in one of the injection positions; the first end of the injection rod 120 is slidably connected to the inside of the barrel 130, and the second end of the injection rod 120 is connected to the injection driving device 150, wherein a cushion block 160 is provided between the second end of the injection rod 120 and the injection driving device 150; the injection driving device 150 is used to drive the injection rod 120 to slide along the barrel 130; Specifically, the injection position adjustment auxiliary device includes a displacement assembly 300 and a clamping assembly 400; more specifically, the displacement assembly 300 and the clamping assembly 400 are installed on a base 200, wherein the base 200 is installed on a frame 110; the clamping assembly 400 clamps and fixes the injection rod 120, and the displacement assembly 400 drives the clamping assembly 400 to move, so that the clamping assembly 400 drives the injection rod 120 to separate from the barrel 130.

[0027] The technical solution of the present invention first removes the spacer 160 between the injection driving device 150 and the injection rod 120, so that the injection rod 120 has displacement space for sliding separation relative to the barrel 130; then, the injection rod 120 is clamped and fixed by the clamping assembly 400 and the displacement assembly 300 drives the injection rod 120 to move away from the barrel 130, so that the first end of the injection rod 120 is separated from the barrel 130; then, the ejection assembly 500 is used to apply a force to the barrel 130 in a direction away from the injection rod 120, so that the barrel 130 and the head plate 140 are separated from each other. Next, the operator installs the barrel 130 to the injection position corresponding to the appropriate injection position assembly block of the head plate 140, and then uses the displacement assembly 300 to reinstall the first end of the injection rod 120 to the inside of the barrel 130, and then re-installs the cushion block 160 between the second end of the injection rod 120 and the injection drive device 150 to ensure that the injection drive device 150 can surely drive the injection rod 120 to slide, thereby completing the injection position replacement operation of the die-casting machine 100. The above process is assisted by the present device, so that a single operator can also complete it alone, effectively reducing the difficulty of disassembly, thereby achieving the purpose of improving the injection position replacement efficiency of the die-casting machine 100.

[0028] There are many specific structures of the displacement assembly 300. Figure 2 The displacement assembly 300 includes a lateral displacement device 310 and at least two longitudinal displacement devices 320; the lateral displacement device 310 is installed on the base 200, and the lateral displacement device 310 is used to drive the injection rod 120 to displace along its axial direction; at least two longitudinal displacement devices 320 are installed on the lateral displacement device 310, and at least two longitudinal displacement devices 320 cooperate to drive the injection rod 120 to displace along the height direction. With such arrangement, it is considered that since the positions of some shot positions in the die-casting machine 100 are distributed vertically along the central axis of the head plate 140, that is to say, the displacement trajectory of the shot rod 120 only needs to be decomposed along its axial direction and along the height direction, the displacement assembly 300 in this embodiment is designed to be a lateral displacement device 310 and at least two longitudinal displacement devices 320, and the lateral displacement device 310 is used to drive the shot rod 120 to displace along its axial direction so as to separate and install it from the barrel 130; at least two longitudinal displacement devices 320 respectively support the axial ends of the shot rod 120, and at least two longitudinal displacement devices 320 are used to drive the shot rod 120 to displace along the height direction so as to move it to the height position corresponding to the shot position; thereby satisfying the replacement demand of the shot rod 120 for the shot position.

[0029] Specifically, the lateral displacement device 310 includes a lateral displacement driving device 311, a sliding seat 312 and at least two guide rails 313. The lateral displacement driving device 311 is used to drive the sliding seat 312 to slide along the guide rails 313. Specifically, the sliding seat 312 is slidably connected to the base 200 through at least two guide rails 313. The lateral displacement driving device 311 is installed on the base 200, and the driving end of the lateral displacement driving device 311 is connected to the sliding seat 312. In this way, the lateral displacement driving device 311 is used as a power source, and at least two guide rails 313 are used as displacement guides of the sliding seat 312 to ensure that the sliding seat 312 slides along a preset track, thereby meeting the requirement of the injection rod 120 to be displaced in the axial direction. The structure is simple and practical. In this embodiment, the lateral displacement driving device 311 can be a hydraulic cylinder.

[0030] Specifically, at least two longitudinal displacement devices 320 are located directly below the axis of the injection rod 120; each longitudinal displacement device 320 includes a lifting drive device 321 and a rod body member 322, the fixed end of the lifting drive device 321 is installed on the sliding seat 312, the driving end of the lifting drive device 321 is connected to the first end of the rod body member 322, and the second end of the rod body member 322 is connected to the clamping assembly 400. In this way, at least two longitudinal displacement devices 320 are set directly below the axis of the injection rod 120, and the lifting drive device 321 is used as a power source to drive the rod body member 322 to move up and down, thereby meeting the need for the injection rod 120 to move in the height direction, and the structure is simple and practical. In this embodiment, the lifting drive device 321 can be a hydraulic cylinder.

[0031] As a preferred solution of the above embodiment, the injection position adjustment auxiliary device also includes an ejection assembly 500, which is used to apply a force to the barrel 130 in a direction away from the injection rod 120 so that the barrel 130 and the head plate 140 are separated from each other; specifically, the ejection assembly 500 includes an ejection drive device 510 and an ejector rod 520, the ejection drive device 510 is installed on the side of at least two rod body members 322, and the driving end of the ejection drive device 510 is connected to the ejector rod 520, wherein the axial direction of the ejector rod 520 is parallel to the axial direction of the injection rod 120; under the driving action of the ejection drive device 510, the end of the ejector rod 520 can move toward the barrel 130. In this configuration, the ejection drive device 510 is used as a power source to drive the ejector rod 520 to move toward the barrel 130. The barrel 130 is driven by the ejector rod 520 to obtain a driving force to separate from the head plate 140, thereby reducing the force required by the operator to separate the barrel 130 from the head plate 140, thereby achieving the purpose of reducing the difficulty of disassembly. In this embodiment, the ejection drive device 510 can be a hydraulic cylinder.

[0032] As a preferred solution of the above embodiment, the injection position adjustment auxiliary device includes a protective cover 600, which is wrapped around the outside of the lateral displacement device 310; the protective cover 600 is provided with a sliding groove 610, which is used for the longitudinal displacement device 320 to perform lateral displacement movement under the driving action of the lateral displacement device 310. In this way, the protective cover 600 is used to wrap the lateral displacement device 310 to play a protective role.

[0033] There are many specific structures of the clamping assembly 400. Figure 3 The clamping assembly 400 includes a first clamping member 410 and a second clamping member 420. A clamping area for clamping the injection rod 120 is formed between the first clamping member 410 and the second clamping member 420. The first end of the first clamping member 410 is hinged to the first end of the second clamping member 420, and the second end of the first clamping member 410 is locked and fixedly connected to the second end of the second clamping member 420. In this way, under the driving action of the displacement assembly 300, the injection rod 120 is first supported on the first clamping member 410, and then the second clamping member 420 is rotated along the hinge to be locked with the first clamping member 410, so as to clamp the injection rod 120 in the clamping area between the first clamping member 410 and the second clamping member 420, so that the displacement assembly 300 can be used to drive the injection rod 120 to move.

[0034] Further, the first clamping member 410 and / or the second clamping member 420 adopt a semicircular ring structure or a V-shaped structure. The above structure can be understood as the first clamping member 410 adopts a semicircular ring structure or a V-shaped structure, or the second clamping member 420 adopts a semicircular ring structure or a V-shaped structure, or the first clamping member 410 and the second clamping member 420 adopt a semicircular ring structure or a V-shaped structure at the same time. In this way, the first clamping member 410 and / or the second clamping member 420 adopting a semicircular ring structure or a V-shaped structure can better clamp and wrap the injection rod 120, thereby improving the clamping firmness of the clamping assembly 400 on the injection rod 120.

[0035] Furthermore, the first clamping member 410 and / or the second clamping member 420 is provided with anti-skid patterns (not shown in the drawings) on one side thereof for contacting the injection rod 120. In this way, the anti-skid patterns can enhance the connection reliability between the first clamping member 410 / the second clamping member 420 and the injection rod 120, and prevent the injection rod 120 from being displaced relative to the clamping assembly 400 during the displacement process.

[0036] In combination with the above-mentioned embodiment, the steps of replacing the injection position of the die-casting machine 100 are roughly described below: Step 1: As attached Figure 3As shown, the clamping assembly 400 remains in a loose state, and the longitudinal displacement device 320 drives the clamping assembly 400 to move upward, and makes its first clamping member 410 contact the injection rod 120; then the second clamping member 420 rotates along the hinge and interlocks with the first clamping member 410; at this time, the injection rod 120 is clamped and fixed between the first clamping member 410 and the second clamping member 420, so that the injection rod 120, the clamping assembly 400, and the longitudinal displacement device 320 form a whole; Step 2: As attached Figure 4 As shown, the spacer 160 between the second end of the injection rod 120 and the injection driving device 150 is removed; Step ③: Under the action of the lateral displacement device 310 , the longitudinal displacement device 320 moves in a direction away from the barrel 130 until the first end of the injection rod 120 escapes from the barrel 130 ; Step ④: As attached Figure 5 As shown, under the action of the longitudinal displacement device 320, the ejector rod 120 rises to a certain height, specifically, the ejector rod 520 in the ejector assembly 500 extends to contact the barrel 130; then, under the action of the ejector drive device 510, the ejector rod 520 moves toward the barrel 130, and after the ejector rod 520 contacts the barrel 130, the driving force is maintained to eject the barrel 130 from the head plate 140, so as to complete the disassembly between the barrel 130 and the head plate 140; then, the ejector drive device 510 drives the ejector rod 520 to reset; Step ⑤: A new shot position is obtained by adjusting the stacking mode of the shot position stacking blocks, and the barrel 130 is installed to the shot position corresponding to the new shot position stacking block; Step 6: As attached Figure 6 As shown, under the action of the longitudinal displacement device 320, the injection rod 120 is driven to rise or fall to align with the new injection position; at this time, the injection drive device 150 also rises or falls to align with the new injection position; Step 7: Under the action of the lateral displacement device 310, the injection rod 120 is driven to move toward the barrel 130 until the first end of the injection rod 120 is reinserted into the barrel 130; Step ⑧: Reset the cushion block 160 to between the second end of the injection rod 120 and the injection driving device 150; Step ⑨: Release the locking state between the first clamping member 410 and the second clamping member 420 to restore the clamping assembly 400 to a loosened state, so that the clamping assembly 400 and the injection rod 120 are released from the integral state; then the longitudinal displacement device 320 drives the clamping assembly 400 to reset; thereby completing the injection position replacement process.

[0037] This embodiment also discloses a die-casting machine, including the injection position adjustment auxiliary device of any of the above embodiments. For the specific structure of the injection position adjustment auxiliary device, reference can be made to the above embodiments. Since the die-casting machine 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 described one by one here.

[0038] It should be noted that the injection position adjustment auxiliary device and other contents of the die-casting machine disclosed in the present invention are prior arts and will not be described in detail herein.

[0039] The above are only optional embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any direct / indirect application of the present invention in other related technical fields is included in the patent protection scope of the present invention.

Claims

1. A shot position adjustment auxiliary device, applied to a die casting machine; the die casting machine comprises a frame, a head plate and a shot drive device, wherein the shot drive device is provided with a shot rod and a barrel, the head plate is provided with a plurality of shot position assembly blocks, the barrel is installed in a shot position formed by the shot position assembly blocks; the shot drive device is used to drive the shot rod to slide along the barrel; It is characterized in that The injection position adjustment auxiliary device includes a displacement component and a clamping component. The clamping component clamps and fixes the injection rod. The displacement component drives the clamping component to move so that the clamping component drives the injection rod to separate from the barrel.

2. The injection position adjustment auxiliary device according to claim 1, characterized in that: A cushion block is arranged between the injection rod and the injection driving device.

3. The injection position adjustment auxiliary device according to claim 1, characterized in that: The displacement assembly includes a lateral displacement device and at least two longitudinal displacement devices; the lateral displacement device is used to drive the injection rod to displace along its axial direction; at least two longitudinal displacement devices are installed on the lateral displacement device, and at least two longitudinal displacement devices cooperate to drive the injection rod to displace along the height direction.

4. The injection position adjustment auxiliary device according to claim 3, characterized in that: The lateral displacement device comprises a lateral displacement driving device, a sliding seat and at least two guide rails. The lateral displacement driving device is used to drive the sliding seat to slide along the guide rails.

5. The injection position adjustment auxiliary device according to claim 4, characterized in that: At least two of the longitudinal displacement devices are located directly below the axis of the injection rod; each of the longitudinal displacement devices includes a lifting drive device and a rod body member, the fixed end of the lifting drive device is installed on the sliding seat, the driving end of the lifting drive device is connected to the first end of the rod body member, and the second end of the rod body member is connected to the clamping assembly.

6. The injection position adjustment auxiliary device according to claim 5, characterized in that: The injection position adjustment auxiliary device further comprises an ejection assembly, and the ejection assembly is used to apply a force to the barrel in a direction away from the injection rod so as to separate the barrel and the head plate from each other.

7. The injection position adjustment auxiliary device according to claim 6, characterized in that: The ejection assembly includes an ejection drive device and an ejector rod, wherein the ejection drive device is installed on the side of at least two of the rod body members, and the driving end of the ejection drive device is connected to the ejector rod, wherein the axial direction of the ejector rod is parallel to the axial direction of the injection rod; under the driving action of the ejection drive device, the end of the ejector rod can move toward the barrel.

8. The injection position adjustment auxiliary device according to claim 3, characterized in that: The injection position adjustment auxiliary device includes a protective cover, which is wrapped around the outside of the lateral displacement device; the protective cover is provided with a sliding groove, and the sliding groove is used for the longitudinal displacement device to perform lateral displacement movement under the driving action of the lateral displacement device.

9. The injection position adjustment auxiliary device according to claim 1, characterized in that: The clamping assembly includes a first clamping member and a second clamping member, wherein a clamping area for clamping the injection rod is formed between the first clamping member and the second clamping member; the first end of the first clamping member is hinged to the first end of the second clamping member, and the second end of the first clamping member is lockably fixedly connected to the second end of the second clamping member.

10. The injection position adjustment auxiliary device according to claim 9, characterized in that: The first clamping member and / or the second clamping member adopts a semicircular ring structure or a V-shaped structure.

11. The injection position adjustment auxiliary device according to claim 9, characterized in that: The first clamping member and / or the second clamping member is provided with anti-slip patterns on one side thereof for contacting the injection rod.

12. A die casting machine, characterized in that: It comprises the injection position adjustment auxiliary device as described in any one of claims 2 to 11.

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