Bagged liquid sealing performance detection device

Abstract

A bagged liquid sealing performance detection device comprises a support, an electric push rod is fixedly installed on the support, the movable end of the electric push rod is fixedly connected with the upper end of a spring telescopic rod, an extrusion plate is fixedly installed at the lower end of the spring telescopic rod, a placing plate is movably arranged below the extrusion plate, a first sliding block is slidably installed on the support, and a transverse shaft is rotatably installed on the first sliding block. The placing plate is fixedly installed on the transverse shaft, the supporting rods are movably arranged on the left side and the right side of the lower portion of the placing plate respectively, the supporting rods are installed on the support in a sliding mode, the supporting rods and the support are connected through the tension springs respectively, inserting holes are formed in the placing plate, inserting rods are movably arranged in the inserting holes, and two guide check blocks are installed on the support. The two ends of the insertion rod can be in sliding contact fit with the guide slopes of the corresponding guide check blocks respectively. The device is simple in structure and ingenious in conception, integrates sealing detection and sorting, adopts a pure mechanical structure, is high in reliability and durable, can meet actual requirements, and is suitable for popularization.

Description

Technical Field

[0001] The invention belongs to the field of packaging bag sealing detection, in particular to a bagged liquid sealing detection device. Background Art

[0002] In the existing production line of bagged liquids, it is impossible to effectively detect and handle broken packages. Conventional detection devices generally perform detection by simply applying pressure. If the sealing is not good, the liquid in the bag will be squeezed out, so that the bags with poor sealing can be found and then sorted and processed. Sorting is usually done manually, which is time-consuming and labor-intensive. Therefore, we have invented a bagged liquid sealing detection device that integrates sealing detection and sorting. Summary of the invention

[0003] The invention provides a bagged liquid sealing detection device to solve the defects in the prior art.

[0004] The present invention is achieved through the following technical solutions:

[0005] A bagged liquid sealing detection device comprises a bracket, an electric push rod is fixedly installed on the bracket, the movable end of the electric push rod is fixedly connected to the upper end of the spring telescopic rod, the lower end of the spring telescopic rod is fixedly installed with an extrusion plate, a placement plate is movably provided below the extrusion plate, a first sliding block is slidably installed on the bracket, a transverse axis is rotatably installed on the first sliding block, the placement plate is fixedly installed on the transverse axis, left and right sides below the placement plate are movably provided with support rods, the support rods are slidably installed on the bracket, the support rods and the bracket are respectively connected by tension springs, a jack is provided on the placement plate, an insertion rod is movably provided in the jack, two guide blocks are installed on the bracket, two ends of the insertion rod can respectively slide in contact with the guide inclined surfaces of the corresponding guide blocks, two bar racks are fixedly installed on the insertion rod, two coaxial gear rings are rotatably installed on the outer periphery of the transverse axis through a one-way bearing, the damping directions of the two one-way bearings are opposite, and the bar racks can mesh with the corresponding gear rings.

[0006] In the above-mentioned bagged liquid sealing detection device, two through grooves connected to the insertion hole are provided on the placement plate corresponding to the bar-shaped rack, the bar-shaped rack is located in the corresponding through grooves and connected to the insertion rod through the through grooves.

[0007] In the bagged liquid sealing detection device as described above, a vertical slide groove is provided on the bracket, the first slider is slidably installed in the vertical slide groove, and the first slider is connected to the vertical slide groove via a compression spring.

[0008] In the bagged liquid sealing detection device as described above, a transverse slide groove is provided on the bracket, and second sliders are slidably installed at both ends of the transverse slide groove, and the support rods are fixedly connected to the corresponding second sliders, and the second sliders are connected to the transverse slide groove by tension springs.

[0009] As described above, in a bagged liquid sealing detection device, the guide block on the right side of the bracket is fixedly connected to the bracket, and the guide block on the left side of the bracket is slidably installed on the bracket. A threaded through hole is provided on the guide block, and the internal thread of the threaded through hole cooperates with a mounting screw, and the screw is rotatably installed on the bracket.

[0010] In the above-mentioned bagged liquid sealing detection device, the bracket is provided with a guide socket, a guide slide bar is slidably arranged in the guide socket, and the guide slide bar is fixed on the extrusion plate.

[0011] As described above, a bagged liquid sealing detection device, the insertion rod includes an inner rod and an outer tube, the inner rod is slidably installed in the outer tube, the outer tube is slidably installed in the insertion hole, the inner rod and the outer tube are connected by a first return spring, the outer tube and the extrusion plate are connected by a second return spring, the pulling force required for the first return spring to stretch is greater than the pulling force required for the second return spring to stretch, the two ends of the outer circumference of the inner rod are respectively fixed with blocks, two first slots distributed on the left and right are provided in the insertion hole, two second slots distributed on the left and right are provided on the inner rod, and a through hole is provided on the outer tube, a ball is movably provided in the through hole, and the ball can be inserted into the first slot or the second slot.

[0012] In the above-mentioned device for detecting the tightness of bagged liquid, rollers are rotatably mounted on both ends of the inner rod.

[0013] The advantages of the present invention are: the present invention has a simple structure, an ingenious design, integrates sealing detection and sorting, adopts a purely mechanical structure, has high reliability and durability, can meet actual needs, and is suitable for promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0015] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 yes Figure 1 Left view of Figure 3 is a schematic diagram of the connection between the guide block and the bracket; Figure 4 is a schematic diagram of a first state of the present invention; Figure 5 is a schematic diagram of a second state of the present invention; Figure 6 is a schematic diagram of a third state of the present invention; Figure 7 yes Figure 2 A partial enlarged view of location Ⅰ; Figure 8 yes Figure 1 A partial enlarged view of location II.

[0016] : 1. bracket, 2. electric push rod, 3. spring telescopic rod, 4. extrusion plate, 5. placement plate, 6. first slider, 7. horizontal axis, 8. support rod, 9. socket, 10. plug rod, 11. guide block, 12. bar rack, 13. gear ring, 14. tension spring, 20. through groove, 30. vertical slide groove, 31. compression spring, 40. horizontal slide groove, 41. second slider, 50. threaded through hole, 51. screw, 52. slide rod, 60. guide socket, 61. guide slide rod, 70. inner rod, 71. outer tube, 72. block, 73. first slot, 74. second slot, 75. through hole, 76. ball, 80. roller. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] A bagged liquid sealing detection device, such as Figure 1 , 2, 3, 4, 5, 6, 7, and 8, comprising a bracket 1, the bracket 1 comprising a bottom plate, a vertical plate and a top plate, an electric push rod 2 is fixedly installed on the bracket 1, the fixed end of the electric push rod 2 is fixedly connected to the upper end of the bracket 1, the movable end of the electric push rod 2 is fixedly connected to the upper end of the spring telescopic rod 3, the electric push rod 2 and the spring telescopic rod 3 can only be telescopically changed up and down, the lower end of the spring telescopic rod 3 is fixedly installed with an extrusion plate 4, and a placement plate 5 is movably provided below the extrusion plate 4, and a first slider 6 is slidably installed on the bracket 1, and the first slider 6 can only move up and down along the bracket 1 Sliding, the horizontal axis 7 is rotatably installed on the first slider 6, the rear end of the horizontal axis 7 is rotatably connected to the front side of the first slider 6 through a bearing, the placement plate 5 is fixedly installed on the horizontal axis 7, the front end of the horizontal axis 7 is fixedly connected to the middle of the rear side of the placement plate 5, the left and right sides below the placement plate 5 are movably provided with support rods 8, the support rods 8 are slidably installed on the bracket 1, the support rods 8 can only slide left and right, the support rods 8 and the placement plate 5 are in sliding contact and cooperation, the support rods 8 and the bracket 1 are respectively connected by tension springs 14, and a socket 9 is provided on the placement plate 5, and the socket 9 The left and right sides are connected to the outside world, and a plug rod 10 is movably provided in the plug hole 9. Both ends of the plug rod 10 extend out of the placement plate 5. Two guide blocks 11 are installed on the bracket 1. One guide block 11 is located at the lower left of the bracket 1, and the other guide block 11 is located at the upper right of the bracket 1. The two ends of the plug rod 10 can respectively slide and contact with the guide inclined surfaces of the corresponding guide blocks 11. Two bar racks 12 are fixedly installed on the plug rod 10. Two coaxial gear rings 13 are rotatably installed on the outer periphery of the horizontal axis 7 through a one-way bearing. The inner periphery of the gear ring 13 It is fixedly connected to the outer ring of the one-way bearing, and the inner ring of the one-way bearing is fixedly connected to the outer periphery of the horizontal axis 7. The damping directions of the two one-way bearings are opposite, and the bar-shaped rack 12 can mesh with the corresponding gear ring 13. After the left end of the plunger 10 slides and contacts with the guide bevel of the left guide block 11, the bar-shaped rack 12 on the left can mesh with the front gear ring 13. After the right end of the plunger 10 slides and contacts with the guide bevel of the right guide block 11, the bar-shaped rack 12 on the right can mesh with the rear gear ring 13. The present invention has a simple structure, an ingenious design, integrates sealing detection and sorting, and adopts a purely mechanical structure, which is highly reliable and durable, can meet actual needs, and is suitable for promotion.When using the present invention, first place the packaging bag containing liquid to be tested on the placement plate 5. At this time, the bottom side of the placement plate 5 is in contact with the top side of the support rod 8 to increase the stability of the placement plate 5. The placement plate 5 will not rotate along the axis of the horizontal axis 7. Then, the electric push rod 2 is energized to control the extension of the electric push rod 2. The electric push rod 2 drives the spring telescopic rod 3 and the extrusion plate 4 to move downward until the bottom side of the extrusion plate 4 is in contact with the top side of the packaging bag. The packaging bag is located between the placement plate 5 and the extrusion plate 4. The extrusion plate 4 applies pressure to the packaging bag. If the packaging bag has good sealing performance, it will not leak and the packaging bag cannot be flattened. At this time, the electric push rod 2 2 is extended, the squeezing plate 4 cannot move downward further, the spring telescopic rod 3 is compressed, and the squeezing plate 4 moves downward, driving the insertion rod 10 and the bar-shaped rack 12 to move downward. At this time, the bar-shaped rack 12 on the right side is meshed with the gear ring 13 on the rear side, and drives the gear ring 13 on the rear side to rotate clockwise. The gear ring 13 on the rear side cannot drive the horizontal shaft 7 to rotate clockwise through the one-way bearing. When the squeezing plate 4 moves upward again to reset, the squeezing plate 4 ends squeezing the packaging bag. At the same time, the bar-shaped rack 12 on the right side drives the gear ring 13 on the rear side to rotate counterclockwise. The gear ring 13 on the rear side drives the horizontal shaft 7 and the placement plate 5 to rotate counterclockwise through the one-way bearing, so that The packaging bag slides to the left; the extrusion plate 4 applies pressure to the packaging bag. If the sealing of the packaging bag is not good, it will leak and the packaging bag will be flattened. At this time, the electric push rod 2 extends, the extrusion plate 4 continues to move downward, and the spring telescopic rod 3 is not compressed. The left end of the insertion rod 10 slides in contact with the guide inclined surface of the guide block 11 on the left, giving the insertion rod 10 a rightward thrust. The insertion rod 10 drives the bar rack 12 to move to the right, so that the bar rack 12 on the left side engages with the gear ring 13 on the front side. When the bar rack 12 on the left side drives the gear ring 13 on the front side to rotate counterclockwise, it is impossible to drive the horizontal shaft 7 to rotate counterclockwise through the one-way bearing. At this time, the extrusion plate 4 When it moves upward to reset, the squeezing of the packaging bag by the squeezing plate 4 ends, and the bar rack 12 on the left drives the gear ring 13 on the front side to rotate clockwise, and the gear ring 13 on the front side drives the horizontal axis 7 and the placement plate 5 to rotate clockwise through the one-way bearing, and the packaging bag slides to the right, thereby realizing the sorting of packaging bags with poor sealing performance; the squeezing plate 4 continues to move upward until the right end of the insertion rod 10 slides in contact with the guide inclined surface of the guide block 11 on the right side, pushing the insertion rod 10 to the left, and the insertion rod 10 drives the bar rack 12 to move to the left to reset, and when the squeezing plate 4 moves downward again, the bar rack 12 on the right side can continue to mesh with the gear ring 13 on the rear side.

[0019] Specifically, as shown in the figure, the placement plate 5 of the present embodiment has two through slots 20 connected to the insertion hole 9 corresponding to the bar-shaped rack 12, and the bar-shaped rack 12 is located in the corresponding through slots 20 and connected to the insertion rod 10 through the through slots 20. The bar-shaped rack 12 is slidably located in the corresponding through slots 20, which increases the stability of the bar-shaped rack 12 sliding left and right.

[0020] Specifically, as shown in the figure, the bracket 1 of this embodiment is provided with a vertical slide groove 30, and the first slider 6 is slidably installed in the vertical slide groove 30, and the first slider 6 is connected to the vertical slide groove 30 through a compression spring 31. When the first slider 6 slides upward along the vertical slide groove 30, the compression spring 31 is compressed and stores energy, and under the action of the compression spring 31, it is convenient for the first slider 6 to slide downward along the vertical slide groove 30 to reset.

[0021] Further, as shown in the figure, the bracket 1 of the present embodiment is provided with a transverse slide groove 40, and the second sliders 41 are slidably mounted at both ends of the transverse slide groove 40, and the support rods 8 are fixedly connected to the corresponding second sliders 41, and the second sliders 41 are connected to the transverse slide grooves through tension springs 14. When the support rod 8 slides inwardly in the transverse direction, the support rod 8 drives the second slider 41 to slide along the transverse slide groove 40, and the tension spring 14 is stretched. After the inward thrust on the support rod 8 is cancelled, the support rod 8 and the second slider 41 slide outward and reset under the tension of the tension spring 14.

[0022] Further, as shown in the figure, the guide block 11 on the right side of the bracket 1 in this embodiment is fixedly connected to the bracket 1, and the guide block 11 on the left side of the bracket 1 is slidably installed on the bracket 1. The bracket 1 is provided with a strip slide groove, and a slide bar 52 is slidably installed in the strip slide groove. The slide bar 52 is fixed on the left guide block 11, and a threaded through hole 50 is provided on the guide block 11. The threaded through hole 50 is threaded to fit the screw 51, and the screw 51 is rotatably installed on the bracket 1. The screw 51 is rotatably connected to the bracket 1 through a bearing. The screw 51 is rotated to move the left guide block 11 upward or downward, thereby adjusting the height of the left guide block 11, so as to meet the detection requirements of liquid packaging bags of different thicknesses.

[0023] Further, as shown in the figure, the bracket 1 of this embodiment is provided with a guide socket 60, and a guide slide bar 61 is slidably provided in the guide socket 60, and the guide slide bar 61 is fixed on the extrusion plate 4. When the extrusion plate 4 moves up and down, the guide slide bar 61 is driven to move up and down, and the guide slide bar 61 slides up and down along the guide socket 60, thereby increasing the stability of the extrusion plate 4 moving up and down.

[0024] Further, as shown in the figure, the insertion rod 10 described in this embodiment includes an inner rod 70 and an outer tube 71. The inner rod 70 is slidably installed in the outer tube 71, and the outer tube 71 is slidably installed in the insertion hole 9. The inner rod 70 and the outer tube 71 can only slide left and right. The inner rod 70 and the outer tube 71 are connected by a first return spring, and the outer tube 71 is connected to the extrusion plate 4 by a second return spring. The tension required for the first return spring to stretch is greater than the tension required for the second return spring to stretch. The two ends of the outer periphery of the inner rod 70 are fixedly installed with stoppers 72 respectively, and two first card grooves 73 distributed left and right are provided in the insertion hole 9, and two second card grooves 74 distributed left and right are provided on the inner rod 70. A through hole 75 is provided on the outer tube 71, and a ball 76 is movably provided in the through hole 75. The ball 76 can be inserted into the first card groove 73 or the second card groove 74, and the two ends of the inner rod 70 can be in sliding contact with the guide inclined surfaces of the corresponding guide block 11. In the initial state, the through hole 75 is aligned with the first slot 73 on the left, the ball 76 is inserted into the first slot 73 on the left, and the second slot 74 on the right is not aligned with the through hole 75. Figure 4As shown, in the initial state, when the inner rod 70 moves leftward or rightward relative to the outer tube 71, the first return spring is stretched and stored energy, thereby facilitating the inner rod 70 to return to its original position relative to the outer tube 71. In the initial state, the bar rack 12 on the right side is meshed with the gear ring 13 on the rear side, and the bar rack 12 on the left side cannot be meshed with the gear ring 13 on the front side; when the extrusion plate 4 moves upward, the right end of the inner rod 70 abuts against and contacts the guide block 11 on the right side, giving the inner rod 70 a leftward thrust. At this time, the ball 76 is located in the first slot 73 on the left side, and the second slot 74 on the right side is not aligned with the through hole 75, so the outer tube 71 cannot move to the left, so the inner rod 70 slides leftward relative to the outer tube 71, and the first return spring is stretched until the extrusion plate 4 moves upward. 4 moves upward to the highest point, the second slot 74 on the right is aligned with the through hole 75, and when the right end of the inner rod 70 slides downward along the guide inclined surface of the guide block 11 on the right, the inner rod 70 moves to the right and resets. Under normal circumstances, the extrusion plate 4 moves up and down, and the above process is repeated; after the right end of the inner rod 70 is separated from the guide block 11 on the right, it returns to the initial state; when the packaging bag leaks, the extrusion plate 4 transitions downward, and the left end of the inner rod 70 slides and contacts with the guide inclined surface of the guide block 11 on the left, giving the inner rod 70 a rightward thrust, and the inner rod 70 first moves to the right relative to the outer tube 71, and the first reset spring is pulled until the second slot 74 on the left is aligned with the through hole 75, and as the inner rod 70 continues to move to the right, the first slot 73 on the left pushes the ball 76 The outer tube 71 starts to move rightward with the inner rod 70, and the ball moves rightward with the inner rod 70, the through hole 75 and the outer tube 71 until the through hole 75 is aligned with the first slot 73 on the right. The ball falls into the first slot 73 on the right under the action of its own gravity. At the same time, the outer tube 71 drives the bar rack 12 to move rightward, and the bar rack 12 on the left engages with the gear ring 13 on the front side. When the extrusion plate 4 moves upward to reset, since the pulling force required for the first reset spring to stretch is greater than the pulling force required for the second reset spring to stretch, the first reset spring first resets the inner rod 70 relative to the outer tube 71, and the second slot 74 on the left is no longer aligned with the through hole 75, so the ball 76 cannot be released from the first slot 73 on the right. When the outer tube 71 is moved out of the groove 73, the outer tube 71 cannot move to the left and reset, and the bar rack 12 on the left side keeps meshing with the gear ring 13 on the front side. When the extrusion plate 4 moves upward and resets, the bar rack 12 on the left side drives the gear ring 13 on the front side to rotate clockwise, and the gear ring 13 rotates clockwise through the one-way bearing horizontal shaft 7 and the placement plate 5, so that the packaging bag slides in the direction; when the extrusion plate 4 moves upward, the right end of the inner rod 70 contacts and contacts the guide inclined surface of the guide block 11 on the right side again, and the inner rod 70 pushes to the left, and the inner rod 70 moves to the left relative to the outer tube 71 until the second slot 74 on the right side is aligned with the through hole 75. The outer tube 71 moves to the left and resets under the action of the second reset spring and the first reset spring, and returns to the initial state.

[0025] Furthermore, as shown in the figure, rollers 80 are rotatably mounted on both ends of the inner rod 70 of this embodiment. The rollers 80 can reduce the friction between the inner rod 70 and the guide inclined surface of the guide block 11, and convert the sliding friction into rolling friction.

[0026] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A bagged liquid sealing detection device, comprising a bracket (1), an electric push rod (2) fixedly mounted on the bracket (1), a movable end of the electric push rod (2) fixedly connected to the upper end of a spring telescopic rod (3), a pressing plate (4) fixedly mounted on the lower end of the spring telescopic rod (3), a placement plate (5) movably arranged below the pressing plate (4), characterized in that: A first slider (6) is slidably mounted on the bracket (1), a transverse shaft (7) is rotatably mounted on the first slider (6), a placement plate (5) is fixedly mounted on the transverse shaft (7), support rods (8) are movably mounted on the left and right sides below the placement plate (5), the support rods (8) are slidably mounted on the bracket (1), the support rods (8) and the bracket (1) are connected via tension springs (14), a plug hole (9) is provided on the placement plate (5), a plug rod (10) is movably mounted in the plug hole (9), two guide blocks (11) are mounted on the bracket (1), two ends of the plug rod (10) can respectively slide in contact with the guide inclined surfaces of the corresponding guide blocks (11), two bar racks (12) are fixedly mounted on the plug rod (10), two coaxial gear rings (13) are rotatably mounted on the outer periphery of the transverse shaft (7) via a one-way bearing, the damping directions of the two one-way bearings are opposite, and the bar racks (12) can mesh with the corresponding gear rings (13).

2. A bagged liquid sealing detection device according to claim 1, characterized in that: The placement plate (5) is provided with two through slots (20) corresponding to the bar-shaped rack (12) and connected to the insertion hole (9); the bar-shaped rack (12) is located in the corresponding through slots (20) and is connected to the insertion rod (10) through the through slots (20).

3. A bagged liquid sealing detection device according to claim 1, characterized in that: The bracket (1) is provided with a vertical slide groove (30), and the first slider (6) is slidably installed in the vertical slide groove (30). The first slider (6) and the vertical slide groove (30) are connected via a compression spring (31).

4. A bagged liquid sealing detection device according to claim 1, characterized in that: The bracket (1) is provided with a transverse sliding groove (40), and second sliders (41) are slidably mounted at both ends of the transverse sliding groove (40), and the support rods (8) are fixedly connected to the corresponding second sliders (41), and the second sliders (41) are connected to the transverse sliding groove via tension springs (14).

5. The device for detecting the sealing performance of bagged liquid according to claim 1, characterized in that: The guide block (11) on the right side of the bracket (1) is fixedly connected to the bracket (1), and the guide block (11) on the left side of the bracket (1) is slidably mounted on the bracket (1). A threaded through hole (50) is provided on the guide block (11), and the internal thread of the threaded through hole (50) is matched with a screw rod (51) for mounting, and the screw rod (51) is rotatably mounted on the bracket (1).

6. A bagged liquid sealing detection device according to claim 1, characterized in that: The bracket (1) is provided with a guide insertion hole (60), a guide sliding rod (61) is slidably arranged in the guide insertion hole (60), and the guide sliding rod (61) is fixed on the extrusion plate (4).

7. A bagged liquid sealing detection device according to claim 1, characterized in that: The insertion rod (10) comprises an inner rod (70) and an outer tube (71), wherein the inner rod (70) is slidably mounted in the outer tube (71), and the outer tube (71) is slidably mounted in the insertion hole (9). The inner rod (70) and the outer tube (71) are connected via a first return spring, and the outer tube (71) and the extrusion plate (4) are connected via a second return spring. The tension required for the first return spring to stretch is greater than the tension required for the second return spring to stretch. Stoppers (72) are fixedly mounted at both ends of the outer periphery of the inner rod (70), two first slots (73) distributed on the left and right are provided in the insertion hole (9), two second slots (74) distributed on the left and right are provided on the inner rod (70), and a through hole (75) is provided on the outer tube (71), and a ball (76) is movably provided in the through hole (75), and the ball (76) can be inserted into the first slot (73) or the second slot (74).

8. A bagged liquid sealing detection device according to claim 7, characterized in that: Rollers (80) are rotatably mounted on both ends of the inner rod (70).

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