Rotary fig picking device

Abstract

The invention relates to the technical field of fruit picking devices, in particular to a rotary fig picking device.An extension pipe is slidably arranged at the inner end of a main rod in the axial direction in a penetrating mode, the outer side of the bottom end of the main rod is fixedly sleeved with a handle used for being manually held and operated, and a screw rod is fixedly installed at the end, away from the main rod, of the extension pipe; a connecting cylinder is spirally arranged on the outer side of the screw rod in a sleeving mode, a picking bowl is fixedly installed at the end, away from the connecting cylinder, of the screw rod, a pull wire is arranged on the outer side of the picking bowl, and the upper end of the pull wire is of an annular structure and penetrates through the inner edge position of the upper end of the picking bowl. After unlocking, the picking bowl moves axially and rotates at the same time, so that the picking mode of manually screwing fruit stems is simulated, the fruit stems are stably separated from fruit branches under the screwing effect, branch damage caused by direct snapping or shearing is avoided, and the follow-up growth state of fruit trees can be kept.

Description

Technical Field

[0001] This invention relates to the field of fruit picking device technology, specifically a rotary fig picking device. Background Technology

[0002] Figs, as a fruit with thin skin and soft flesh, have high requirements for harvesting methods during the ripening stage. Current fig harvesting operations mostly rely on manual picking or simple auxiliary tools. Usually, the fruit is separated from the branch by directly pulling, cutting, or clamping the fruit stem. The above-mentioned picking methods concentrate the force during operation, which can easily cause the fruit stem to break at an unstable position, or even damage the fruit branch, which is not conducive to the subsequent growth and continuous fruiting of the fruit tree.

[0003] To improve harvesting efficiency, some existing technologies have developed pole-type fruit harvesting devices that extend the pole to reach fruits at higher locations. However, to meet the needs of harvesting from higher locations, the pole structure is often designed to be quite long, causing a significant shift in the overall center of gravity of the device. This not only increases the operator's workload but also reduces the stability and safety during the harvesting and unloading process. Furthermore, existing harvesting devices often cannot adjust the pole length or working stroke in a timely manner after harvesting, requiring a long working length to be maintained during unloading, which is inconvenient and affects continuous harvesting efficiency. Therefore, this application proposes a rotary fig harvesting device. Summary of the Invention

[0004] The purpose of this invention is to provide a rotary fig harvesting device to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a rotary fig harvesting device, comprising a main rod, an extension tube slidably threaded through the inner end of the main rod along the axial direction, a handle for manual gripping and operation fixedly sleeved on the outer side of the bottom end of the main rod, a spiral rod fixedly installed at the end of the extension tube away from the main rod, the outer surface of the spiral rod forming a spiral structure along the axial direction, and a connecting cylinder spirally sleeved on its outer side, enabling the connecting cylinder to achieve rotational linkage under the guidance of the spiral rod, and a connecting cylinder fixedly installed at the upper end of the connecting cylinder. A support cylinder is provided to support and position the harvesting component. A harvesting bowl is fixedly installed at the end of the support cylinder away from the connecting cylinder. A traction line is provided on the outside of the harvesting bowl. The upper end of the traction line has a ring structure and passes through the inner edge of the upper end of the harvesting bowl. The lower end passes through the support cylinder along its axis and extends into its interior. When the traction line is pulled, it applies an inward traction force to the upper end of the harvesting bowl, causing the upper end of the harvesting bowl, which was originally in an unfolded state, to gradually converge inward, thereby forming a clamping fit for the fig stalk or fruit.

[0006] As a further embodiment of the present invention, the support cylinder is provided with a movable cylinder inside, and an extension cylinder is fixedly installed at the upper end of the movable cylinder. The extension cylinder is coaxially arranged with the movable cylinder and moves up and down synchronously with the movable cylinder. By providing a movable cylinder that can move up and down inside the support cylinder, and fixing an extension cylinder coaxially arranged with it at the upper end of the movable cylinder, the extension cylinder can move up and down synchronously with the movable cylinder, thereby achieving stable driving of the subsequent unlocking and rotating mechanism, which is beneficial to ensuring the continuity of the picking action and the consistency of the movement.

[0007] As a further embodiment of the present invention, a central rod is axially inserted inside the connecting cylinder, and an isolation block is fixedly installed at the upper end of the central rod. The isolation block is located above the extension cylinder, and a return spring is connected between the isolation block and the support cylinder, so that the isolation block can automatically return to its original position under the action of the return spring after the external force is released. By setting a central rod axially inserted inside the connecting cylinder and fixing an isolation block at the upper end of the central rod, and the isolation block being located above the extension cylinder and connected to the support cylinder through a return spring, the isolation block can automatically return to its original position after the external force is released, thereby ensuring that the picking mechanism can quickly reset after completing the action.

[0008] As a further embodiment of the present invention, the bottom end of the traction line passes through the movable cylinder in sequence and is fixedly connected to the outer surface of the central rod. Multiple unlocking rods are sleeved on the outer surface of the connecting cylinder. Each unlocking rod is arranged at intervals along the circumference of the connecting cylinder. Its upper end passes through the support cylinder and is fixedly connected to the movable cylinder. Multiple rectangular holes are opened on the side wall of the connecting cylinder. A locking block is slidably arranged in each rectangular hole. The locking block is located above the spiral rod, and the locking block is slidably connected to the corresponding unlocking rod.

[0009] As a further embodiment of the present invention, a transmission sleeve is fitted on the outer surface of the extension tube. The transmission sleeve is movably disposed along the axial direction of the extension tube and is located below the connecting cylinder. A strip-shaped hole is formed on the side wall of the extension tube along the axial direction. By fitting the axially movable transmission sleeve on the outer surface of the extension tube and forming a strip-shaped hole on the side wall of the extension tube, the transmission sleeve can form an effective contact and fit with the extension block inside the extension tube. Thus, during the picking action, the downward moving force of the connecting cylinder is reliably transmitted to the extension tube, realizing the synchronous movement and retraction function of the extension tube.

[0010] As a further embodiment of the present invention, an extension block is provided inside the extension tube. The extension block is slidably disposed along the axial direction of the extension tube, and its outer surface passes through the strip hole and is partially exposed outside the extension tube, so that the extension block can form a contact fit with the transmission sleeve. The bottom end of the transmission sleeve abuts against the outer surface of the extension block.

[0011] As a further embodiment of the present invention, a limiting block is fixedly installed at the bottom end of the extension tube, and multiple guide rods are fixedly installed at the bottom end of the extension block. The guide rods pass through the interior of the limiting block along the axial direction. An isolation cover is fixedly installed at the bottom end of the limiting block, and a spring is connected between the isolation cover and the main rod. By setting a limiting block at the bottom end of the extension tube, installing multiple guide rods that pass through the interior of the limiting block along the axial direction at the bottom end of the extension block, and simultaneously setting an isolation cover at the bottom end of the limiting block and connecting it with the main rod, the extension tube can smoothly retract along the guide rods after the picking action is completed.

[0012] As a further embodiment of the present invention, the inner end of the limiting block is provided with multiple locking blocks, and the inner end of the main rod is provided with a locking groove at the corresponding position. The end of the locking block away from the limiting block is provided and can be locked inside the locking groove. By providing multiple locking blocks at the inner end of the limiting block and making its far end lockable in the locking groove opened at the inner end of the main rod, a reliable locking between the extension tube and the main rod is achieved.

[0013] As a further embodiment of the present invention, a drag line is fixedly connected to the bottom end of the central rod. The drag line extends downward along the interior of the main rod, and its bottom end is fixedly connected to the interior of the handle. By fixing the drag line to the bottom end of the central rod and extending downward along the interior of the main rod to the handle, the operator can directly pull the drag line through the handle to apply axial driving force to the central rod, thereby triggering the linkage action of the picking mechanism and realizing the closing and rotation operation of the picking bowl.

[0014] As a further embodiment of the present invention, the guide rod passes through the interior of the locking block, and a triangular block is fixedly installed on the outer surface of the guide rod. The triangular block is oriented towards the central rod, and one side of it forms an inclined surface. The inclined surface abuts against the inner wall of the corresponding locking block. By fixing the triangular block on the outer surface of the guide rod and oriented it towards the central rod, with its inclined surface abutting against the inner wall of the locking block, the guide rod can actuate the locking block when it moves axially, causing the locking block to move in a predetermined direction and disengage from the locking position, thereby reliably releasing the locking relationship between the extension tube and the main rod.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. The present invention uses the connecting cylinder and the screw rod to make the picking bowl rotate while moving axially after unlocking, thereby simulating the picking method of manually twisting the fruit stalk. This allows the fruit stalk to be smoothly separated from the fruit branch under the twisting action, avoiding the damage to the branch caused by direct pulling or cutting, and is conducive to maintaining the subsequent growth of the fruit tree. 2. This invention, by setting a retractable structure between the main rod and the extension tube, and cooperating with the linkage design of the ejection spring and the locking mechanism, enables the picking device to quickly shorten its stroke after picking and facilitate unloading, and can quickly restore the working height after unloading, reducing the center of gravity shift caused by excessive rod length, and improving the stability and safety of the operator during the unloading process. 3. Through the linkage between the central rod, the isolation block, the movable cylinder, the unlocking rod, and the locking block, the locking relationship between the connecting cylinder and the spiral rod can only be released after the operator pulls the handle and triggers the full stroke. This ensures that the rotation of the picking bowl occurs at the correct time, effectively preventing the device from rotating in a non-working state or due to accidental activation, thus improving safety and operational reliability. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the harvesting device; Figure 2 This is a structural diagram showing the disassembly of the picking bowl and connecting tube; Figure 3 This is a schematic diagram of the internal structure of the connecting cylinder; Figure 4 A schematic diagram showing the disassembled structure of the connecting cylinder and extension tube; Figure 5 This is a schematic diagram of the internal structure of the extension tube; Figure 6 for Figure 5 Schematic diagram of the structure at point A; Figure 7 This is a schematic diagram of the internal structure of the limiting block; Figure 8 This is a structural diagram showing the positional relationship between the guide rod and the locking block.

[0017] In the picture: 1. Handle; 2. Main rod; 3. Extension tube; 4. Harvesting bowl; 101. Support cylinder; 102. Connecting cylinder; 103. Helical rod; 104. Traction line; 105. Isolation block; 106. Return spring; 107. Movable cylinder; 108. Unlocking rod; 109. Locking block; 110. Center rod; 111. Extension cylinder; 201. Transmission sleeve; 202. Extension block; 203. Guide rod; 204. Locking slot; 205. Triangular block; 301. Limiting block; 302. Isolation cover; 303. Drag line; 304. Ejection spring; 305. Snap-fit ​​block; 306. Auxiliary spring. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Example 1: Please refer to Figure 1 , Figure 2 A rotary fig picking device includes a main rod 2, an extension tube 3 slidably passing through the inner end of the main rod 2 along the axial direction, and a handle 1 for manual gripping and operation fixedly sleeved on the outer side of the bottom end of the main rod 2 so that the operator can stably control the device during the picking process. A spiral rod 103 is fixedly installed at the end of the extension tube 3 away from the main rod 2. The outer surface of the spiral rod 103 forms a spiral structure along the axial direction, and a connecting cylinder 102 is spirally sleeved on its outer side so that the connecting cylinder 102 can achieve rotation linkage under the guidance of the spiral rod 103. A support cylinder 101 is fixedly installed at the upper end of the connecting cylinder 102. The support cylinder 101 is used to support and position the picking component. A picking bowl 4 is fixedly installed at the end away from the connecting cylinder 102. The picking bowl 4 is made of rubber material with a certain elasticity and flexibility. Its upper end is designed with a petal-shaped outward expansion structure, so that the picking bowl 4 can cover the fig fruit during the picking process, thereby reducing the squeezing and damage to the surface of the fruit. A traction line 104 is provided on the outside of the picking bowl 4. The upper end of the traction line 104 is in the shape of a ring and passes through the inner edge of the upper end of the picking bowl 4. The lower end passes through the support cylinder 101 along its axis and extends into its interior. During the harvesting process, when the operator pulls the traction line 104, the traction line 104 applies an inward pulling force to the upper end of the harvesting bowl 4, causing the upper end of the harvesting bowl 4, which was originally in an unfolded state, to gradually converge inward, thereby forming a clamping fit for the fig stalk or fruit.

[0020] like Figures 2-4 As shown, the support cylinder 101 has a movable cylinder 107 inside, and an extension cylinder 111 is fixedly installed at the upper end of the movable cylinder 107. The extension cylinder 111 is coaxially arranged with the movable cylinder 107 and moves up and down synchronously with the movable cylinder 107. A central rod 110 is axially inserted inside the connecting cylinder 102. An isolation block 105 is fixedly installed at the upper end of the central rod 110. The isolation block 105 is located above the extension cylinder 111, and a return spring 106 is connected between the isolation block 105 and the support cylinder 101, so that the isolation block 105 can automatically return to its original position under the action of the return spring 106 after the external force is released. During the harvesting process, when the isolation block 105 moves downward along the axis of the support cylinder 101 under the action of external force and contacts the upper end of the extension cylinder 111, the isolation block 105 can push the extension cylinder 111 and the movable cylinder 107 downward as a whole, thereby realizing the linkage drive of the movable cylinder 107. The bottom end of the traction line 104 passes through the movable cylinder 107 in sequence and is fixedly connected to the outer surface of the central rod 110, so that when the traction line 104 is pulled, it can drive the isolation block 105, the extension cylinder 111 and the movable cylinder 107 to generate synchronous displacement through the central rod 110. Multiple unlocking rods 108 are sleeved on the outer surface of the connecting cylinder 102. Each unlocking rod 108 is arranged at intervals along the circumference of the connecting cylinder 102. Its upper end passes through the support cylinder 101 and is fixedly connected to the movable cylinder 107, so that the movable cylinder 107 can synchronously drive the unlocking rods 108 to move when it moves up and down. Multiple rectangular holes are opened on the side wall of the connecting cylinder 102. A locking block 109 is slidably arranged in each rectangular hole. The locking block 109 is located above the spiral rod 103 and is slidably connected to the corresponding unlocking rod 108. Specifically, the lower end of the unlocking rod 108 is inclined. When the movable cylinder 107 moves downward under the action of the traction line 104, the unlocking rod 108 moves downward accordingly. Its inclined lower end can push the locking block 109 to move radially away from the connecting cylinder 102, so that the locking block 109 is released from the abutment or limiting state with the upper end of the spiral rod 103.

[0021] Example 2: Please refer to Figures 4-6 A rotary fig picking device, based on embodiment 1, has a transmission sleeve 201 fitted on the outer surface of the extension tube 3. The transmission sleeve 201 is movably arranged along the axial direction of the extension tube 3 and is located below the connecting cylinder 102 to receive the downward driving force from the connecting cylinder 102. A strip-shaped hole is opened along the axial direction on the side wall of the extension tube 3. An extension block 202 is provided inside the extension tube 3. The extension block 202 is slidably disposed along the axial direction of the extension tube 3. Its outer surface passes through the strip hole and is partially exposed outside the extension tube 3, so that the extension block 202 can form a contact engagement with the transmission sleeve 201. The bottom end of the transmission sleeve 201 abuts against the outer surface of the extension block 202. When the connecting cylinder 102 moves downward in the unlocked state and contacts the upper end of the transmission sleeve 201, the connecting cylinder 102 can push the extension block 202 downward through the transmission sleeve 201 during the continuous downward movement, thereby realizing the step-by-step transmission of driving force. A limiting block 301 is fixedly installed at the bottom end of the extension tube 3. Multiple guide rods 203 are fixedly installed at the bottom end of the extension block 202. The guide rods 203 pass through the limiting block 301 along the axial direction. An isolation cover 302 is fixedly installed at the bottom end of the limiting block 301. An ejector spring 304 (not shown in the figure) is connected between the isolation cover 302 and the main rod 2. The ejector spring 304 is used to provide an upward reset force for the isolation cover 302 and the extension tube 3 after the external force is released. Multiple locking blocks 305 are passed through the inner end of the limiting block 301. A locking groove 204 is opened at the corresponding position of the inner end of the main rod 2. The end of the locking block 305 away from the limiting block 301 passes through and can be locked inside the locking groove 204.

[0022] like Figure 4 , Figure 5 , Figure 7 , Figure 8 The bottom ends of multiple guide rods 203 are connected together by a fixing ring to form an integral force-bearing structure. An auxiliary spring 306 is connected between the fixing ring and the isolation cover 302. A drag line 303 is fixedly connected to the bottom end of the center rod 110. The drag line 303 extends downward along the inside of the main rod 2, and its bottom end is fixedly connected to the inside of the handle 1, so that the operator can apply axial tension to the center rod 110 by pulling the drag line 303. The guide rod 203 passes through the inside of the locking block 305. A triangular block 205 is fixedly installed on the outer surface of the guide rod 203. The triangular block 205 is set towards the center rod 110, and one side of it forms an inclined surface. The inclined surface abuts against the inner side wall of the corresponding locking block 305. The guide rod 203 and the triangular block 205 move downward synchronously. During the downward sliding process, the inclined surface of the triangular block 205 generates a radial thrust on the locking block 305, causing the locking block 305 to move towards the center rod 110 under the action of the triangular block 205. This causes the locking block 305 to disengage from the locking groove 204, thus releasing the locking relationship between the extension tube 3 and the main rod 2.

[0023] The working principle of this invention is: During the fig harvesting process, the harvesting bowl 4 is placed on the fig, and the main pole 2 and handle 1 are held by both hands respectively. After being placed on the fig, the handle 1 is directly grasped and pulled. Then, the handle 1 pulls the drag line 303 and the central pole 110 during the movement. During the movement of the central pole 110, the traction line 104 is pulled. At this time, the traction line 104 applies an inward traction force to the upper end of the harvesting bowl 4, so that the upper end of the harvesting bowl 4, which was originally in an unfolded state, gradually gathers inward, thereby forming a clamping fit for the fig stem or fruit. Meanwhile, as the central rod 110 moves, it also moves the isolation block 105, which compresses the return spring 106. As the handle 1 continues to pull, the isolation block 105 begins to move downward and then contacts the upper end of the extension cylinder 111. The extension cylinder 111 then moves downward, and the movable cylinder 107 moves as well. The unlocking rod 108 drives the locking block 109 to move. At this time, the locking block 109 no longer contacts the upper end of the spiral rod 103. Then the connecting cylinder 102 also moves and moves axially along the spiral rod 103. During the movement, it rotates under the action of the spiral rod 103. At the same time, with the overall rotation of the picking bowl 4, the fruit stalk is separated from the fruit branch under the twisting action, thereby achieving stable picking of figs, reducing fruit damage and improving picking efficiency. As the connecting cylinder 102 continues to move downward, its bottom end contacts the surface of the extension block 202, and then pushes the extension block 202 to move. Subsequently, under the transmission of the guide rod 203, the locking block 305 is driven to move, thereby causing the locking block 305 to disengage from the locking slot 204, completing the release of the locking relationship between the extension tube 3 and the main rod 2. Then, as the handle 1 continues to pull, the extension tube 3 retracts into the interior of the main rod 2. At this time, the ejector spring 304 is compressed, so that it can quickly shorten the stroke and facilitate unloading. Then, the handle 1 is released, and the ejector spring 304 pushes the extension tube 3 to move under the action of the elastic force. As the extension tube 3 moves, the limit block 301 also moves. At this time, the locking block 305 is locked back into the locking slot 204, and the picking bowl 4 opens again.

[0024] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A rotary fig picking device comprising a main bar (2), characterised in that: The inner end of the main rod (2) is slidably provided with an extension tube (3) in the axial direction, the bottom end of the main rod (2) is fixedly provided with a handle (1) outside for artificial holding and operation, the end of the extension tube (3) away from the main rod (2) is fixedly provided with a spiral rod (103), the outer surface of the spiral rod (103) is formed with a spiral structure in the axial direction, and a connecting barrel (102) is spirally provided outside the spiral rod (103), so that the connecting barrel (102) can be rotationally connected under the guidance of the spiral rod (103), the upper end of the connecting barrel (102) is fixedly provided with a supporting barrel (101), the supporting barrel (101) is used for supporting and positioning the picking component, and the end of the supporting barrel (101) away from the connecting barrel (102) is fixedly provided with a picking bowl (4), the outer side of the picking bowl (4) is provided with a traction line (104), the upper end of the traction line (104) is annular and is provided in the inner edge position of the upper end of the picking bowl (4), and the lower end is provided in the axial direction of the supporting barrel (101) and extends to the inside, when the traction line (104) is pulled, the traction line (104) exerts an inward traction force on the upper end of the picking bowl (4), so that the upper end of the picking bowl (4) in the unfolded state is gradually gathered inward, so as to form clamping cooperation with the fig stem or fruit.

2. A rotary fig picking device according to claim 1, characterized in that: The inside of the supporting barrel (101) is provided with a movable barrel (107), and the upper end of the movable barrel (107) is fixedly provided with an extension barrel (111).

3. A rotary fig-picking device according to claim 2, characterized in that: The inside of the connecting barrel (102) is provided with a center rod (110) in the axial direction, the upper end of the center rod (110) is fixedly provided with a separation block (105), the separation block (105) is located above the extension barrel (111), and the separation block (105) and the supporting barrel (101) are connected with a return spring (106), so that the separation block (105) can be automatically returned under the action of the return spring (106) after the external force is removed.

4. A rotary fig-picking device according to claim 3, characterized in that: The bottom end of the traction line (104) is fixedly connected with the outer surface of the center rod (110) after passing through the movable barrel (107) in sequence, the outer surface of the connecting barrel (102) is provided with a plurality of unlocking rods (108), each unlocking rod (108) is arranged in the circumferential direction of the connecting barrel (102) and is fixedly connected with the movable barrel (107) after passing through the supporting barrel (101), a plurality of rectangular holes are formed in the side wall of the connecting barrel (102), and a locking block (109) is slidably arranged in each rectangular hole, the locking block (109) is located above the spiral rod (103), and the locking block (109) is slidably connected with the corresponding unlocking rod (108).

5. A rotary fig-picking device according to claim 1, characterized in that: The outer surface of the extension tube (3) is provided with a transmission sleeve (201), the transmission sleeve (201) is movably arranged in the axial direction of the extension tube (3) and is located below the connecting barrel (102), and a strip-shaped hole is formed in the side wall of the extension tube (3) in the axial direction.

6. A rotary fig-picking device according to claim 5, characterized in that: The inside of the extension pipe (3) is provided with an extension block (202) which is slidably arranged along the axial direction of the extension pipe (3), and the outside surface of the extension block (202) is partially exposed outside the extension pipe (3) through a strip-shaped hole, so that the extension block (202) can be in contact with the transmission sleeve (201), and the bottom end of the transmission sleeve (201) is in abutment with the outside surface of the extension block (202).

7. A rotary fig-picking device according to claim 6, characterized in that: The bottom end of the extension pipe (3) is fixedly provided with a limiting block (301), and the bottom end of the extension block (202) is fixedly provided with a plurality of guide rods (203) which are arranged in the inside of the limiting block (301) along the axial direction, and the bottom end of the limiting block (301) is fixedly provided with an isolation cover (302), and the isolation cover (302) is connected with the main rod (2) through an elastic spring (304).

8. A rotary fig-picking device according to claim 7, characterized in that: The inside end of the limiting block (301) is provided with a plurality of clamping blocks (305), and the inside end of the main rod (2) is provided with a locking clamping groove (204) at the corresponding position, and the end of the clamping block (305) away from the limiting block (301) is arranged in and clamped in the inside of the locking clamping groove (204).

9. A rotary fig-picking device according to claim 4, characterized in that: The bottom end of the central rod (110) is fixedly connected with a tow line (303), and the tow line (303) extends downward along the inside of the main rod (2), and the bottom end of the tow line (303) is fixedly connected to the inside of the handle (1).

10. A rotary fig-picking device according to claim 7, characterized in that: The guide rod (203) is arranged in the inside of the clamping block (305), and the outside surface of the guide rod (203) is fixedly provided with a triangular block (205), and the triangular block (205) is arranged towards the central rod (110), and one side of the triangular block (205) is provided with an inclined surface which is in abutment with the inside wall of the corresponding clamping block (305).

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