CN115781922A - A kind of fiber reinforced concrete preparation equipment - Google Patents

Abstract

The invention relates to the field of reinforced concrete manufacturing, in particular to fiber reinforced concrete preparation equipment which comprises a cylindrical mixing box, wherein the bottom side of the mixing box is fixedly connected with a support, one side of the bottom end of the mixing box is fixedly communicated with a grout discharging pipe with a valve, and the top end of the mixing box is opened and connected with a cover body; the inboard rotation of lid is connected with mixing stirring structure, and power structure is connected with mixing stirring structure transmission, and the lid top is rotated and is connected with the ultrasonic vibration structure, and the ultrasonic vibration structure is connected with mixing stirring structure transmission, and the ultrasonic vibration structure passes mixing stirring structure and extends to the mixing box inboard. Utilize these structures, realized one kind and can utilized ultrasonic vibration to clear up the caking phenomenon that exists fast among the fibre reinforcement concrete mixing, reduced the time of stirring, improved the effect of stirring simultaneously, set up mixing stirring structure simultaneously and drive the layering that ultrasonic vibration structure rotated together and also avoided the emergence when the concrete mixing was applied to the supersound because of the layering that solid material density difference leads to.

Description

A kind of fiber reinforced concrete preparation equipment

technical field

The invention relates to the field of reinforced concrete production, in particular to a fiber reinforced concrete preparation equipment.

Background technique

Concrete refers to the artificial stone made of cement as the main cementitious material, mixed with water, sand, stones, chemical admixtures and mineral admixtures when necessary, mixed in appropriate proportions, uniformly stirred, compacted and cured. Since the current concrete exhibits a brittle characteristic under tensile or bending loads, in order to improve the brittleness of the concrete material, a certain amount of chopped fibers are usually added to the concrete material to form high ductility concrete. Among them, fiber-reinforced concrete is a fiber-reinforced composite material based on the design principle of micro-mechanics. It has high ductility, high damage resistance, high durability, high strength, and good crack control ability. However, in the prior art, when adding fibers to the concrete for reinforcement, agglomeration often occurs. At this time, the staff generally adopts the method of prolonging the mixing time to break up the agglomerates, which is time-consuming and has great impact on engineering operations. Therefore, there is an urgent need for a device that can shorten the break-up time and improve the break-up effect to assist workers in processing fiber-reinforced concrete.

Contents of the invention

The purpose of the present invention is to provide a kind of fiber reinforced concrete preparation equipment to solve the above problems, achieve the purpose of quickly dispelling the agglomeration phenomenon, shorten the mixing time, and improve the mixing effect.

To achieve the above object, the present invention provides the following scheme:

A fiber-reinforced concrete preparation equipment, comprising a cylindrical mixing box, the bottom side of the mixing box is fixedly connected with a bracket, the side of the bottom end of the mixing box is fixedly connected with a slurry discharge pipe with a valve, the top of the mixing box is open and connected to There is a cover body; several lifting cylinders are fixedly connected to the top peripheral side of the mixing box, and the output shaft of the lifting cylinder is fixedly connected to the peripheral side of the cover body through a support rod; the inner bottom end of the mixing box is fixedly connected to a dynamic structure;

The inner side of the cover is rotatably connected with a mixing and stirring structure, the power structure is in transmission connection with the mixing and agitating structure, and the top of the cover is rotatably connected with an ultrasonic vibration structure, and the ultrasonic vibration structure is connected with the mixing and stirring structure. Structural transmission connection, the ultrasonic vibration structure extends through the mixing and stirring structure to the inside of the mixing box.

Preferably, the power structure includes a protective cover, a motor fixedly connected to the inner side of the protective cover, the protective cover is fixedly connected to the inner bottom side of the mixing box, and the output shaft of the motor vertically passes through the The top end of the protective cover is rotatably connected with the protective cover, and the top end of the output shaft of the motor is fixedly connected with a bar-shaped output shaft, and the bar-shaped output shaft is transmission-connected with the mixing and stirring structure.

Preferably, the cover is of a ring structure, the top end of the cover extends out of the side of the mixing box and is fixedly connected to the support rod, and the bottom of the cover is provided with an outer edge of the cover, so The outer edge of the cover is in contact with the mixing box, and the inner edge of the cover is provided with a gear ring groove and a sliding groove, the gear ring groove is located above the sliding groove, and the inner edge of the cover is fixedly connected above the gear ring groove. .

Preferably, the mixing and stirring structure includes a turntable, the turntable is rotatably connected in the sliding groove, the center of the top surface of the turntable is rotatably connected with a driving gear, and the bar-shaped output shaft is connected to the driving gear Clamping; several driven gears are meshed on the peripheral side of the driving gear, and the side of the driven gear away from the driving gear is meshed with the gear ring groove;

The turntable is provided with several turntable drive holes along the axis of the turntable; the turntable drive hole is connected with a hollow rotating rod, and the top end of the hollow rotating rod is fixedly connected with the driven gear.

Preferably, a central hole of the turntable is provided in the center of the turntable, the diameter of the central hole of the turntable is larger than the diameter of the bar-shaped output shaft, a gear slot is opened in the center of the driving gear, and the bar-shaped output shaft is connected to the bar-shaped output shaft. match the gear slots described above.

Preferably, spiral fan blades are fixedly connected around the bottom end of the hollow rotating rod.

Preferably, the ultrasonic vibration structure includes a slip ring box and an ultrasonic generator rotationally connected to the slip ring box, the slip ring box is fixedly connected to the cover through an ultrasonic bracket; the slip ring box is fixedly connected There are a positive pole fixed ring and a negative pole fixed ring, and the peripheral side of the ultrasonic generator is fixedly connected with a positive pole contact ring and a negative pole contact ring. The positive pole stationary ring is in rotational contact with the positive pole contact ring. The contact ring rotates the contact.

Preferably, the ultrasonic generator is arranged coaxially with the mixing and stirring structure, the output shaft of the ultrasonic generator is fixedly connected with a connecting shaft, and the end of the connecting shaft far away from the ultrasonic generator is fixedly connected with a branch rod , one end of the branch rod away from the connecting shaft is fixedly connected with several sliding rods;

The sliding rod is rotationally connected with the driven gear and the hollow rotating rod, and the axis of the driven gear is provided with a driven gear socket, and the sliding rod passes through the driven gear socket, the hollow rotating rod in sequence The rod extends to the inside of the mixing box, and one end of the sliding rod located at the mixing box is fixedly connected with an excitation head.

Preferably, several second balls are rotationally connected between the driven gear and the rotating table, and several first balls are rotationally connected between the rotating table and the bottom side of the slide groove.

Preferably, the turn table is a round table structure, the diameter of the bottom surface of the turn table is smaller than the diameter of the top surface, the driven gear is arranged obliquely on the table surface of the turn table, and the hollow rotating rod and the sliding rod are all along the The shaft center setting of the driven gear.

The present invention has following technical effect:

By setting the power structure in the mixing box, during operation, the cover is placed on the top of the mixing box, and then the mixing and stirring structure connected to the inner side of the cover can be connected with the power structure, so that the power structure can drive the mixing and stirring structure to perform Rotate to continuously stir the concrete mixed with fibers in the mixing box, and when the mixing and stirring structure rotates, the ultrasonic vibration structure on it is driven to rotate together, and one end of the ultrasonic vibration structure extends to the inside of the mixing box, The concrete with fibers in the mixing box can be continuously ultrasonically mixed. One end of the ultrasonic vibration structure is located at the bottom side of the mixing box, which ensures that it can not only ensure the mixing effect, but also reduce the agglomeration of the fibers on the bottom side. The flocculation is broken up, driven by the mixing and stirring structure, the ultrasonic vibration structure can stably rotate along the bottom side of the mixing box, realizing comprehensive and continuous mixing of fiber reinforced concrete, with a good mixing effect.

Utilizing these structures, it realizes a method that can stably provide ultrasonic vibration when mixing concrete, and then quickly eliminate the agglomeration phenomenon existing in the mixing of fiber-reinforced concrete, reducing the mixing time and improving the mixing effect at the same time. Setting the mixing and stirring structure to drive the ultrasonic vibration structure to rotate together also avoids the stratification caused by the difference in density between solids when ultrasonic is applied to concrete mixing.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required in the embodiments. Obviously, the accompanying drawings in the following description are only some of the present invention. Embodiments, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without paying creative labor.

Fig. 1 is the front view of the present invention;

Fig. 2 is a sectional view of the present invention;

Fig. 3 is the structural representation of power structure;

Fig. 4 is the structural representation of mixing structure;

Fig. 5 is the schematic diagram of part A in Fig. 2;

Fig. 6 is a partial schematic view of the ultrasonic vibration structure;

Fig. 7 is a schematic diagram of the meshing condition of the driven gear and the driving gear.

Among them, 1. Mixing box; 2. Support; 3. Slurry discharge pipe; 4. Lifting cylinder; 5. Cover body; 6. Ultrasonic vibration structure; 7. Mixing and stirring structure; 8. Power structure; 401. Support rod ;501, inner edge of the cover; 502, gear ring groove; 503, sliding groove; 504, outer edge of the cover; 505, ultrasonic bracket; 601, ultrasonic generator; 602, slip ring box; 603, positive fixed ring; 604, negative Fixed ring; 605, positive contact ring; 606, negative contact ring; 607, connecting shaft; 608, branch rod; 609, sliding rod; Two balls; 704, driven gear; 705, driving gear; 706, gear slot; 707, turntable center hole; 708, driven gear jack; 709, turntable driving hole; 710, hollow rotating rod; 711, spiral fan leaf; 801, motor; 802, protective cover; 803, bar output shaft.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Referring to Figures 1-7, the present invention provides: a fiber reinforced concrete preparation equipment, including a cylindrical mixing box 1, the bottom side of the mixing box 1 is fixedly connected with a bracket 2, and the side of the bottom end of the mixing box 1 is fixedly connected with a belt The slurry discharge pipe 3 of the valve, the top opening of the mixing box 1 is connected with the cover body 5; the top peripheral side of the mixing box 1 is fixedly connected with several lifting cylinders 4, and the output shaft of the lifting cylinder 4 passes through the support rod 401 and the cover body 5 The bottom of the peripheral side is fixedly connected; the inner bottom of the mixing box 1 is fixedly connected with a power structure 8;

The inner side of the cover body 5 is rotatably connected to a mixing and stirring structure 7, the power structure 8 is connected to the mixing and stirring structure 7, and the top of the cover 5 is rotatably connected to an ultrasonic vibration structure 6, and the ultrasonic vibration structure 6 is connected to the mixing and stirring structure 7 through transmission. The ultrasonic vibration structure 6 extends to the inside of the mixing box 1 through the mixing and stirring structure 7 .

By setting the power structure 8 in the mixing box 1, during operation, the cover body 5 is placed on the top of the mixing box 1, and then the mixing and stirring structure 7 connected to the inner side of the cover body 5 can be connected with the power structure 8, so that the power structure 8 can drive the mixing and stirring structure 7 to rotate, and continuously mix the concrete mixed with fibers in the mixing box 1, and when the mixing and stirring structure 7 rotates, the ultrasonic vibration structure 6 on it is driven to rotate together, And one end of the ultrasonic vibration structure 6 extends to the inside of the mixing box 1, so that the concrete with fibers in the mixing box 1 can be continuously ultrasonically mixed, and one end of the ultrasonic vibration structure 6 is located at the bottom part of the mixing box 1, ensuring its While ensuring the mixing effect, it is possible to break up the flocculation of the bottom side fiber agglomeration, driven by the mixing and stirring structure 7, the ultrasonic vibration structure 6 can stably rotate along the bottom side of the mixing box 1, realizing a comprehensive, Continuous mixing of fiber reinforced concrete with good mixing effect.

To further optimize the solution, the power structure 8 includes a protective cover 802, a motor 801 fixedly connected to the inner side of the protective cover 802, the protective cover 802 is fixedly connected to the inner bottom side of the mixing box 1, and the output shaft of the motor 801 passes through the bottom of the protective cover 802 vertically upwards. The top is rotatably connected with the protective sleeve 802 , the top of the output shaft of the motor 801 is fixedly connected with a bar-shaped output shaft 803 , and the bar-shaped output shaft 803 is transmission-connected with the mixing and stirring structure 7 .

The protective cover 802 can be used to protect the internal structure of the power structure 8 from being polluted by concrete, and the bar-shaped output shaft 803 of the motor 801 can be set to match the shape of the gear slot 706, and then drive the driving gear 705 through clamping to carry out turn.

To further optimize the scheme, the cover body 5 is an annular structure, the top peripheral side of the cover body 5 extends out of the edge of the mixing box 1 and is fixedly connected with the support rod 401, the bottom peripheral side of the cover body 5 is provided with a cover outer edge 504, and the outer edge 504 of the cover body Abutting against the mixing box 1, the inner edge of the cover body 5 is provided with a gear ring groove 502 and a sliding groove 503, the gear ring groove 502 is located above the sliding groove 503, and the upper edge of the cover body 502 is fixedly connected with the inner edge 501 of the cover.

The gear ring groove 502 in the cover body 5 can allow the driven gear 704 to rotate along its tooth groove, and the other end of the driven gear 704 is driven to rotate by the driving gear 705, and there is a relatively large gap between the driving gear 705 and the driven gear 704. A large transmission ratio can enhance the power of the motor 801 and allow the driven gear 704 to have greater power. The sliding groove 503 ensures that the rotating table 701 and the structure on it can rotate around the sliding groove 503 stably, providing support for the rotating table 701 .

To further optimize the scheme, the mixing and stirring structure 7 includes a rotating table 701, which is rotatably connected in the sliding groove 503, and the center of the top surface of the rotating table 701 is rotatably connected to a driving gear 705, and the bar-shaped output shaft 803 is clamped with the driving gear 705; There are several driven gears 704 meshed on the peripheral side of the driving gear 705, and the end of the driven gear 704 away from the driving gear 705 meshes with the gear ring groove 502;

Turntable 701 is provided with several turntable driving holes 709 along the circumference of turntable central hole 707;

The driving gear 705 on the turntable 701 drives the driven gear 704 to rotate along the gear ring groove 502, and the hollow rotating rod 710 is fixedly connected to the bottom of the driven gear 704, and the hollow rotating rod 710 also follows the driven gear 704 to rotate and rotate. It revolves around the driving gear 705, and then can rotate around the axis of the driving gear 705 along the inside of the mixing box 1 while rotating by the spiral fan blade 711 below. The hollow rotating rod 710 and the rotating table 701 are rotating connected, when the hollow rotating rod 710 rotates, it can drive the rotating table 701 to rotate.

To further optimize the scheme, the center of the turntable 701 is provided with a turntable center hole 707, the diameter of the turntable center hole 707 is larger than the diameter of the bar output shaft 803, and the center of the driving gear 705 is provided with a gear slot 706, and the bar output shaft 803 and the gear slot 706 matches.

In a further optimized solution, a helical fan blade 711 is fixedly connected to the periphery of the bottom end of the hollow rotating rod 710 .

In a further optimization scheme, the ultrasonic vibration structure 6 includes a slip ring box 602, an ultrasonic generator 601 rotationally connected with the slip ring box 602, the slip ring box 602 and the cover body 5 are fixedly connected through an ultrasonic bracket 505; the slip ring box 602 is fixedly connected with Positive electrode fixing ring 603, negative electrode fixing ring 604, positive electrode contact ring 605 and negative electrode contact ring 606 are fixedly connected to the peripheral side of ultrasonic generator 601, positive electrode fixing ring 603 is in rotational contact with positive electrode contact ring 605, negative electrode fixing ring 604 is in contact with negative electrode contact ring 606 Rotating contact.

The positive fixing ring 603 provides the positive pole for the ultrasonic generator 601 , and the negative fixing ring 604 provides the negative pole for the ultrasonic generator 601 , so that when the ultrasonic generator 601 rotates, it can also provide power for the ultrasonic generator 601 .

To further optimize the scheme, the ultrasonic generator 601 is coaxially arranged with the mixing and stirring structure 7, the output shaft of the ultrasonic generator 601 is fixedly connected with a connecting shaft 607, and the end of the connecting shaft 607 away from the ultrasonic generator 601 is fixedly connected with a branch rod 608, and the branch One end of the rod 608 away from the connecting shaft 607 is fixedly connected with several sliding rods 609;

The sliding rod 609 is rotationally connected with the driven gear 704 and the hollow rotating rod 710, and the axis of the driven gear 704 is provided with a driven gear jack 708, and the sliding rod 609 passes through the driven gear jack 708, the hollow rotating rod 710 and Extending to the inside of the mixing box 1 , one end of the sliding rod 609 located at the mixing box 1 is fixedly connected with an excitation head 610 .

The sliding rod 609 sequentially passes through the driven gear socket 708, the hollow rotating rod 710 and is fixedly connected with the excitation head 610. The vibration generated by the upper ultrasonic generator 601 drives the vibration excitation head 610 to vibrate, which is the vibration of the bottom side. Concrete provides ultrasonic vibrations. When the hollow rotating rod 710 rotates, it can drive the sliding rod 609 to rotate, and the ultrasonic generator 601 above the sliding rod 609 will also be driven to rotate, so it is necessary to set the slip ring box 602 to provide power for the rotating ultrasonic generator 601 .

In a further optimization scheme, several second balls 703 are rotationally connected between the driven gear 704 and the rotating table 701 , and several first balls 702 are rotationally connected between the rotating table 701 and the bottom side of the sliding groove 503 . The arrangement of the first ball 702 and the second ball 703 reduces the friction between the driven gear 704 , the rotating table 701 and the slide groove 503 .

To further optimize the scheme, the turntable 701 is a circular platform structure, the diameter of the bottom surface of the turntable 701 is smaller than the diameter of the top surface, the driven gear 704 is obliquely arranged on the table surface of the turntable 701, and the hollow rotating rod 710 and the sliding rod 609 are all along the direction of the driven gear 704. axis settings. The inclined hollow rotating rod 710 and sliding rod 609 can better stir the concrete below, allowing the concrete in the mixing box 1 to form a certain flow direction, and can fully mix the concrete in all directions and corners.

In describing the present invention, it should be understood that the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", The orientations or positional relationships indicated by "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention, rather than indicating or It should not be construed as limiting the invention by implying that a referenced device or element must have a particular orientation, be constructed, and operate in a particular orientation.

The above-mentioned embodiments are only to describe the preferred mode of the present invention, not to limit the scope of the present invention. Without departing from the design spirit of the present invention, those skilled in the art may make various Variations and improvements should fall within the scope of protection defined by the claims of the present invention.

Claims (10)

1. A fiber reinforced concrete preparation equipment is characterized in that: the device comprises a cylindrical mixing box (1), wherein a support (2) is fixedly connected to the bottom side of the mixing box (1), a pulp discharge pipe (3) with a valve is fixedly communicated with one side of the bottom end of the mixing box (1), and an opening is formed in the top end of the mixing box (1) and is connected with a cover body (5); the periphery of the top end of the mixing box (1) is fixedly connected with a plurality of lifting cylinders (4), and output shafts of the lifting cylinders (4) are fixedly connected with the periphery of the cover body (5) through support rods (401); the bottom end of the inner side of the mixing box (1) is fixedly connected with a power structure (8);

lid (5) inboard is rotated and is connected with mixing stirring structure (7), power structure (8) with mixing stirring structure (7) transmission is connected, lid (5) top is rotated and is connected with ultrasonic vibration structure (6), ultrasonic vibration structure (6) with mixing stirring structure (7) transmission is connected, ultrasonic vibration structure (6) are passed mixing stirring structure (7) extend to mixing box (1) is inboard.

2. The fiber reinforced concrete preparation equipment of claim 1, characterized in that power structure (8) includes protective sheath (802), fixed connection is in motor (801) of protective sheath (802) inboard, protective sheath (802) fixed connection in the inside bottom side of mixing box (1), the output shaft of motor (801) vertically upwards pass the top of protective sheath (802) and with protective sheath (802) rotate and be connected, the output shaft top fixed connection of motor (801) has bar output shaft (803), bar output shaft (803) with mixing stirring structure (7) transmission is connected.

3. The fiber reinforced concrete preparation device of claim 2, wherein the cover body (5) is of an annular structure, the top end periphery of the cover body (5) extends out of the edge of the mixing box (1) and is fixedly connected with the support rod (401), the bottom end periphery of the cover body (5) is provided with a cover body outer edge (504), the cover body outer edge (504) is abutted against the mixing box (1), the inner edge of the cover body (5) is provided with a gear ring groove (502) and a sliding groove (503), the gear ring groove (502) is positioned above the sliding groove (503), and the cover body inner edge (501) is fixedly connected above the gear ring groove (502).

4. The fiber reinforced concrete preparation equipment according to claim 3, wherein the mixing and stirring structure (7) comprises a rotating table (701), the rotating table (701) is rotatably connected in the sliding groove (503), the center of the top surface of the rotating table (701) is rotatably connected with a driving gear (705), and the strip-shaped output shaft (803) is clamped with the driving gear (705); a plurality of driven gears (704) are meshed with the peripheral side of the driving gear (705), and one side, far away from the driving gear (705), of each driven gear (704) is meshed with the gear ring groove (502);

the rotating table (701) is provided with a plurality of rotating table driving holes (709) along the axial center circumference; the rotary table is connected with a hollow rotating rod (710) in the rotary table driving hole (709), and the top end of the hollow rotating rod (710) is fixedly connected with the driven gear (704).

5. The fiber reinforced concrete preparation device of claim 4, wherein a turntable central hole (707) is formed in the center of the rotating table (701), the diameter of the turntable central hole (707) is larger than that of the strip-shaped output shaft (803), a gear slot (706) is formed in the center of the driving gear (705), and the strip-shaped output shaft (803) is matched with the gear slot (706).

6. The apparatus for manufacturing fiber reinforced concrete according to claim 4, wherein a spiral fan blade (711) is fixedly connected to the bottom peripheral side of the hollow rotating rod (710).

7. A fibre-reinforced concrete production plant according to claim 4, characterised in that said ultrasonic vibrating structure (6) comprises a slip-ring box (602), an ultrasonic generator (601) rotatably connected to said slip-ring box (602), said slip-ring box (602) being fixedly connected to said cover (5) by means of an ultrasonic support (505); the ultrasonic generator is characterized in that an anode fixing ring (603) and a cathode fixing ring (604) are fixedly connected in the slip ring box (602), an anode contact ring (605) and a cathode contact ring (606) are fixedly connected on the peripheral side of the ultrasonic generator (601), the anode fixing ring (603) is in rotating contact with the anode contact ring (605), and the cathode fixing ring (604) is in rotating contact with the cathode contact ring (606).

8. The fiber reinforced concrete preparation equipment according to claim 7, wherein the ultrasonic generator (601) and the blending and stirring structure (7) are coaxially arranged, an output shaft of the ultrasonic generator (601) is fixedly connected with a connecting shaft (607), one end of the connecting shaft (607) far away from the ultrasonic generator (601) is fixedly connected with a branch rod (608), and one end of the branch rod (608) far away from the connecting shaft (607) is fixedly connected with a plurality of sliding rods (609);

slide bar (609) with driven gear (704), hollow bull stick (710) rotate and are connected, driven gear jack (708) have been seted up in the axle center of driven gear (704), slide bar (609) pass in proper order driven gear jack (708), hollow bull stick (710) and extend to inside mixing box (1), slide bar (609) are located the one end fixedly connected with excitation head (610) of mixing box (1).

9. A fibre-reinforced concrete production plant according to claim 7, characterised in that a number of second balls (703) are rotatably connected circumferentially between the driven gear (704) and the rotating table (701), and a number of first balls (702) are rotatably connected between the rotating table (701) and the underside of the sliding channel (503).

10. A fiber reinforced concrete preparing apparatus according to claim 7, wherein said rotating table (701) is a circular truncated cone structure, the diameter of the bottom surface of said rotating table (701) is smaller than that of the top surface, said driven gear (704) is obliquely arranged on the top surface of said rotating table (701), and said hollow rotating rod (710) and said sliding rod (609) are arranged along the axis of said driven gear (704).

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