Tunnel support jetting device

Abstract

The embodiment of the invention provides a tunnel support jetting device, and relates to the technical field of concrete jetting. A tunnel support spraying device comprises a concrete spraying device and a spraying head which is connected to one side of the concrete spraying device and used for spraying, a butt joint pipe is connected to one side of the concrete spraying device, and meanwhile a swing pipe and a rotating pipe which can rotate are sequentially arranged at an opening in one end of the butt joint pipe in a butt joint mode. After the second motor is started, the second worm gear is driven by the second worm at the output end of the second motor, the rotating pipe rotates upwards with the second worm gear as the center, and therefore the spray head is close to the top of the tunnel. Under the positive and negative rotation action of the first motor, the swing pipe continuously swings, and then the spray head is driven to swing back and forth to spray concrete, so that uniform supporting of the top area of the tunnel is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of concrete spraying, and in particular relates to a tunnel support spraying device. Background Art

[0002] Tunnel construction has become one of the important ways to connect different geographical areas. During the tunnel construction process, the reliability and construction efficiency of the support system are crucial to ensuring the quality and safety of the project. Among them, shotcrete is one of the key links in tunnel support, and its construction quality directly affects the safety performance of the entire tunnel.

[0003] In the prior art (publication number CN117888928B, patent name is a patent application for a tunnel support spraying device), a telescopic structure is included, and the two ends of the telescopic structure are respectively connected to connecting supports, and the connecting supports are respectively connected to pipes through which sprayed concrete passes, and the pipes are connected to a plurality of spraying heads of concrete. In the process of implementing the technical solution, it is found that the prior art has at least the following problems.

[0004] In the above patents, the operation mode of shotcrete in tunnel support mainly relies on manual handheld spray guns or simple hand-cranked brackets to complete the operation. Although this method can meet the construction needs to a certain extent, it also has some obvious disadvantages. First, manual hand-held spraying is not only labor-intensive, but also easily leads to excessive physical exhaustion of workers under long-term operation, affecting work efficiency; secondly, since the top of the tunnel is usually curved, when using a hand-cranked bracket for spraying, the position needs to be adjusted frequently, which not only increases the workload, but also may cause uneven spraying. Summary of the invention

[0005] The present application aims to solve at least one of the technical problems of uneven tunnel spraying in the prior art. To this end, the present application proposes a tunnel support spraying device.

[0006] To achieve the above-mentioned purpose, the specific technical scheme of the present invention is as follows: a tunnel support injection device, including a concrete injection device, and a nozzle for injection connected to one side of the concrete injection device, one side of the concrete injection device is connected to a docking tube, and at the same time, a rotatable swinging tube and a rotating tube are sequentially docked at the opening of one end of the docking tube, and a injection pipe is docked at the opening of the other end of the rotating tube, and the nozzle is connected to the surface of the injection pipe by a threaded connection.

[0007] Preferably, a worm gear is fixed at the opening of one end of the swing tube connected to the butt joint tube, and a worm screw that can drive the worm screw to rotate is also meshed on the outer peripheral surface of the worm gear, and a motor is connected to one end of the worm screw, and one end of the motor frame connected below the motor is fixedly connected to the surface of the butt joint tube.

[0008] Preferably, the swing tube is arranged in an L-shaped structure, and a rotating tube is docked at the opening of the other end of the swing tube, and a worm gear 2 is fixed at the docking point of the rotating tube, and a worm gear 2 is meshed on the outer peripheral surface of the worm gear 2, and a motor 2 is fixedly connected to the other end of the worm gear 2, and the bottom of the motor 2 is connected to a motor frame 2 fixedly connected to one side of the outer peripheral surface of the swing tube.

[0009] Preferably, an opening at one end of the rotating tube is butted against a spray tube, and spray heads are distributed in sequence and at equal intervals on the outer surface of the spray tube.

[0010] Preferably, a gear three is fixed at the joint of the injection pipe, and a limiting column extends to one side in the upper area of ​​the gear three, and a limiting plate is fixedly connected to the upper part of the outer circumference of the rotating tube, and a limiting groove is downwardly provided on one side of the upper surface of the limiting plate.

[0011] Preferably, a crown gear is fixed on one side of the outer surface of the swing tube, and a rotating frame is extended on one side of the outer surface of the rotating tube, and a rotating shaft 1 and a rotating shaft 2 are coaxially connected to the two rotating frames, and a gear 1 meshing with the crown gear is fixed on one end of the rotating shaft 1.

[0012] Preferably, a rotating sleeve is fixed to two opposite ends of the rotating shaft, and the rotating sleeve is a hollow structure with one end open, and the rotating sleeve is sleeved on the outer peripheral surface of a rotating head fixedly connected to one end of the rotating shaft.

[0013] Preferably, the inner ring wall of the rotating sleeve is also provided with equidistantly distributed protrusions, and the outer circumferential surface of the rotating head is downwardly provided with a telescopic groove, the interior of which is provided with a limit block capable of telescopic displacement, a spring is provided between the bottom of the limit block and the bottom surface of the inner cavity of the telescopic groove, and gear 2 is fixed at the other end of the rotating shaft 2, and gear 2 is meshed and connected with gear 3.

[0014] Preferably, both ends of the injection pipe are respectively provided with a flippable swing frame, and both ends of the swing frame are provided with rotatable rotating rollers, and one end of one of the rotating rollers is connected to a motor four, and pulleys are respectively fixed at the other ends of the two rotating rollers, wherein a belt is connected between the two pulleys.

[0015] Preferably, a motor frame three is fixed to one side of the bottom surface of the injection pipe, and a motor three is fixed on the motor frame three. At the same time, a worm three is connected to the power output end of the motor three, and a worm wheel three is fixed to one side of the swing frame surface close to the worm wheel three, and the worm wheel three is meshingly connected with the worm wheel three.

[0016] The tunnel support injection device of the present invention has the following advantages:

[0017] 1. A tunnel support spraying device, when the motor 2 is started, the worm 2 at the output end drives the worm gear 2, so that the rotating tube rotates upward with the worm gear 2 as the center, so that the spray head approaches the top of the tunnel. Under the forward and reverse rotation of the motor 1, the swing tube continues to swing, thereby driving the spray head to swing back and forth to spray concrete, so as to achieve uniform support for the top area of ​​the tunnel.

[0018] 2. A tunnel support spraying device, when the rotating tube rotates with the worm gear 2 as the center, the gear 1 arranged on one side thereof will mesh with the crown gear, causing the rotating shaft 1 and the rotating shaft 2 to rotate. The rotation of the rotating shaft 2 drives the gear 3 to rotate 90 degrees through the gear 2, so that the spraying tube is parallel to the top of the tunnel, expanding the spraying range of the nozzle.

[0019] 3. In this tunnel support spraying device, when the spray head is swung to one side through the swing pipe to spray, the motor 3 is started, and the worm 3 at its output end drives the worm gear 3, so that the rotating roller is close to the support area to be sprayed. Then, the motor 4 rotates to drive the rotating roller to rotate. Under the rotation of the swing pipe, the rotating roller can clean the area to be sprayed, ensuring that the sprayed concrete can be well bonded with the surrounding rock or the original structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 It is a schematic diagram of the overall explosion structure of the present invention;

[0023] Figure 3 The rotary tube structure of the present invention is schematically shown in FIG. Figure 1 ;

[0024] Figure 4 The rotary tube structure of the present invention is schematically shown in FIG. Figure 2 ;

[0025] Figure 5 The rotary tube explosion structure of the present invention is schematically shown. Figure 1 ;

[0026] Figure 6 Schematic diagram of the explosion structure of the present invention Figure 2 ;

[0027] Figure 7It is a schematic diagram of the explosion structure of the rotating shaft 1 and the rotating shaft 2 of the present invention;

[0028] Figure 8 It is a schematic diagram of the top view of the rotating shaft 1 and the rotating shaft 2 of the present invention;

[0029] Fig. 9 For the present invention Figure 8 Schematic diagram of the AA section structure;

[0030] Fig.10 For the present invention Fig. 9 The enlarged structural diagram at A in the middle;

[0031] Fig.11 The swing frame structure of the present invention is shown in FIG. Figure 1 ;

[0032] Fig.12 The swing frame structure of the present invention is shown in FIG. Figure 2 .

[0033] Explanation of the markings in the figure: 1. Concrete spraying device; 11. Feeding port; 12. Butt pipe; 121. Motor frame 1; 122. Motor 1; 123. Worm 1; 13. Swinging pipe; 131. Crown gear; 132. Worm gear 1; 133. Motor frame 2; 14. Rotating pipe; 141. Worm gear 2; 142. Rotating frame; 143. Limiting plate; 144. Limiting groove; 15. Motor 2; 151. Worm gear 2; 2. Spraying pipe; 21. Spraying head; 22, limit column; 23, gear three; 24, motor frame three; 241, motor three; 242, worm three; 3, shaft one; 31, gear one; 32, shaft two; 321, gear two; 322, rotating sleeve; 323, bump; 33, rotating head; 331, telescopic slot; 332, limit block; 333, spring; 4, swing frame; 41, worm gear three; 42, rotating roller; 421, pulley; 422, belt; 43, motor four. DETAILED DESCRIPTION

[0034] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the embodiments of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0035] In the description of the embodiments of the present invention, it should be understood that the terms "length", "vertical", "horizontal", "top", "bottom", etc. indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present invention.

[0036] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0037] In the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0038] The disclosure below provides many different embodiments or examples to implement different structures of the embodiments of the present invention. In order to simplify the disclosure of the embodiments of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the embodiments of the present invention. In addition, the embodiments of the present invention can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed.

[0039] like Figure 1-Figure 2 As shown, a tunnel support spraying device of the present invention includes a movable concrete spraying device 1, and a feed port 11 is fixed on one side above the concrete spraying device 1, through which the concrete to be sprayed can be sprayed to the tunnel support area. A butt joint 12 is connected to the spraying port of the concrete spraying device 1, and one end of the butt joint 12 is connected to the feed port 11, so that the concrete can enter the butt joint 12.

[0040] At the same time, a rotatable swing pipe 13 and a rotating pipe 14 are connected in sequence at one end opening of the butt joint pipe 12, and a spray pipe 2 is connected at the other end opening of the rotating pipe 14. The surface of the spray pipe 2 can spray concrete onto the surface of the tunnel to be supported through a nozzle 21 threadedly connected. Therefore, after the concrete enters the concrete spraying device 1 through the feed port 11, the concrete can be sprayed out from the butt joint pipe 12, the swing pipe 13, the rotating pipe 14 and the nozzle 21, and the tunnel spraying task is completed immediately.

[0041] like Figure 2-Figure 6As shown, a worm wheel 132 is fixed at the opening of one end of the swing tube 13 docked with the butt joint tube 12, and a worm 123 that can drive the worm wheel 132 to rotate is also meshed on the outer circumference of the worm wheel 132, and one end of the worm 123 is connected to the motor 122, and one end of the motor frame 121 connected below the motor 122 is fixedly connected to the surface of the butt joint tube 12. Therefore, after the motor 122 is running, the worm 123 connected to the output end of the motor 122 can drive the meshed worm wheel 132, and as the worm wheel 132 rotates, the swing tube 13 can swing back and forth.

[0042] The swing tube 13 is arranged in an L-shaped structure, and the rotating tube 14 is docked at the opening of the other end of the swing tube 13, and a worm gear 141 is fixed at the docking point of the rotating tube 14, and a worm gear 151 is meshed on the outer peripheral surface of the worm gear 141. The other end of the worm gear 151 is fixedly connected to the motor 15, and the bottom of the motor 15 is connected to the motor frame 133 fixedly connected to one side of the outer peripheral surface of the swing tube 13. As the motor 15 is running, the worm gear 151 provided at the output end of the motor 15 drives the worm gear 141. After the worm gear 141 rotates, the rotating tube 14 can rotate upward with the worm gear 141 as the axis, and then the nozzle 21 can approach the top of the tunnel. Under the continuous forward and reverse rotation of the motor 122, the swing tube 13 can be continuously swung, and then the nozzle 21 can be continuously swung back and forth to spray, which is convenient for spraying concrete in the tunnel support area.

[0043] like Figure 3-Figure 10 As shown, a jet pipe 2 is docked at the opening of one end of the rotating tube 14, and a plurality of nozzles 21 are distributed equidistantly on the outer surface of the jet pipe 2. By setting multiple groups of nozzles 21, the jet efficiency of tunnel support can be accelerated. At the same time, a gear 3 23 is fixed at the docking point of the jet pipe 2, and a limiting column 22 extends to one side in the upper area of ​​the gear 3 23. A limiting plate 143 is fixedly connected to the upper part of the outer peripheral surface of the rotating tube 14. A limiting groove 144 is downwardly provided on one side of the upper surface of the limiting plate 143, and one end of the limiting column 22 extends to the inside of the limiting groove 144, so that the rotation angle of the jet pipe 2 is limited to ninety degrees.

[0044] A crown gear 131 is fixed on one side of the outer surface of the swing tube 13, and a rotating frame 142 is extended on one side of the outer surface of the rotating tube 14. The two rotating frames 142 are coaxially connected to the rotating shaft 13 and the rotating shaft 2 32, and a gear 1 31 meshing with the crown gear 131 is fixed on one end of the rotating shaft 13. A rotating sleeve 322 is fixed on the end of the rotating shaft 2 32 opposite to the rotating shaft 13. The rotating sleeve 322 is a hollow structure with one end open. The rotating sleeve 322 is sleeved on the outer circumference of the rotating head 33 fixedly connected to one end of the rotating shaft 13. The inner ring wall of the rotating sleeve 322 is also equidistantly distributed with protrusions 323. The outer circumference of the rotating head 33 is downwardly provided with a telescopic groove 331, and a limit block 332 capable of telescopic displacement is provided inside the telescopic groove 331. A spring 333 is provided between the bottom of the limit block 332 and the bottom surface of the inner cavity of the telescopic groove 331. A gear 2 321 is fixed to the other end of the second rotating shaft 32, and the gear 2 321 is meshed with the gear 3 23. Therefore, when the rotating tube 14 rotates with the worm gear 2 141 as the axis, the gear 1 31 provided on one side of the rotating tube 14 is meshed with the crown gear 131, so that the rotating shaft 1 3 and the second rotating shaft 32 can rotate. As the rotating shaft 2 32 rotates, the gear 3 23 is driven to rotate 90 degrees through the gear 2 321, so that the spraying tube 2 can be parallel to the top of the tunnel, so that the spraying area of ​​the spray head 21 is increased.

[0045] like Figure 11-Figure 12 As shown, a flippable swing frame 4 is respectively provided at both ends of the injection pipe 2, and a rotatable rotating roller 42 is provided at both ends of the swing frame 4, and a motor 43 is connected to one end of one of the rotating rollers 42. When the motor 43 is turned on, the rotating roller 42 can be rotated, and pulleys 421 are respectively fixed at the other ends of the two rotating rollers 42, wherein a belt 422 is sleeved between the two pulleys 421, so that when one of the rotating rollers 42 is rotated, the other one can be rotated.

[0046] A motor frame 3 24 is fixed on one side of the bottom surface of the spraying pipe 2, and a motor 3 241 is fixed on the motor frame 3 24, and a worm 3 242 is connected to the power output end of the motor 3 241. A worm gear 3 41 is fixed on one side of the surface of the swing frame 4 close to the worm gear 3 242, and the worm gear 3 41 is meshed and connected with the worm gear 3 242. Therefore, when the nozzle 21 swings to one side through the swing tube 13 to spray, the motor 3 241 is running at this time. As the motor 3 241 runs, the worm gear 3 242 provided at its output end drives the worm gear 3 41, and then the rotating roller 42 on one side is close to the support area to be sprayed, and the motor 43 rotates at the same time. As the motor 43 rotates, the rotating roller 42 connected to the output end rotates, and then the rotating roller 42 on one side can clean the support area to be sprayed under the rotation of the swing tube 13, ensuring that the sprayed concrete can be well bonded with the surrounding rock or the original structure.

[0047] A tunnel support spraying device has a working principle: when the motor 15 is started, it drives the worm gear 141 through the worm gear 151 at its output end. As the worm gear 141 rotates, the rotating tube 14 connected thereto can move upward with the worm gear 141 as the center. In this way, the spray head 21 can approach the top of the tunnel. When the motor 122 continuously rotates forward and reverse, the swing tube 13 will continuously swing back and forth, so that the spray head 21 can repeatedly swing to spray concrete, thereby effectively completing the support work of the top area of ​​the tunnel;

[0048] When the rotating tube 14 rotates around the axis of the worm gear 2 141, the gear 1 31 installed on one side of the rotating tube 14 will mesh with the crown gear 131. This meshing allows the rotating shaft 1 3 and the rotating shaft 2 32 to rotate accordingly. When the rotating shaft 2 32 rotates and drives the gear 3 23 to rotate 90 degrees through the gear 2 321 on it, the spray pipe 2 can be adjusted to a position parallel to the top of the tunnel. In this way, the spray range of the nozzle 21 can be expanded to cover a larger area;

[0049] When the nozzle 21 swings to one side through the swing tube 13 to perform the spraying operation, the motor 3 241 also starts to run. When the motor 3 241 is running, the worm 3 242 at its output end drives the worm gear 3 41, so that the rotating roller 42 on one side moves to the vicinity of the support area to be sprayed. At the same time, the motor 43 is also started and drives the rotating roller 42 connected to its output end to rotate. Under the swinging action of the swing tube 13, the rotating roller 42 can clean the area where concrete is to be sprayed, ensuring that the sprayed concrete can fully bond with the surrounding rock of the tunnel or the existing structural surface.

[0050] It should be noted that the specific model specifications of motor 1 122, motor 2 15, motor 3 241 and motor 4 43 need to be selected and determined based on the actual specifications of the device, and the specific selection calculation method adopts the existing technology in the field, so it will not be elaborated again.

[0051] The power supply and principles of motor 1 122 , motor 2 15 , motor 3 241 and motor 4 43 are clear to those skilled in the art and will not be described in detail herein.

[0052] It is to be understood that the present invention is described by some embodiments, and it is known to those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A tunnel support spraying device, comprising a concrete spraying device (1), and a spraying head (21) for spraying connected to one side of the concrete spraying device (1), characterized in that: One side of the concrete spraying device (1) is connected to a butt joint pipe (12), and a rotatable swing pipe (13) and a rotating pipe (14) are sequentially butt jointed at an opening at one end of the butt joint pipe (12), and a spray pipe (2) is butt jointed at an opening at the other end of the rotating pipe (14), and a spray head (21) is connected to the surface of the spray pipe (2) via a threaded connection.

2. The tunnel support injection device according to claim 1, characterized in that: A worm gear (132) is fixed at the opening of one end of the swing tube (13) docked with the docking tube (12), and a worm (123) capable of driving the worm gear (132) to rotate is also meshed on the outer peripheral surface of the worm gear (132), and one end of the worm (123) is connected to a motor (122), and one end of a motor frame (121) connected below the motor (122) is fixedly connected to the surface of the docking tube (12).

3. The tunnel support injection device according to claim 2 is characterized in that: The swing tube (13) is arranged in an L-shaped structure, and a rotating tube (14) is butted against an opening at the other end of the swing tube (13), and a worm gear (141) is fixed at the butt joint of the rotating tube (14), and a worm gear (151) is meshed on the outer peripheral surface of the worm gear (141), and a motor (15) is fixedly connected to the other end of the worm gear (151), and the bottom of the motor (15) is connected to a motor frame (133) fixedly connected to one side of the outer peripheral surface of the swing tube (13).

4. The tunnel support injection device according to claim 3 is characterized in that: The opening at one end of the rotating tube (14) is butt-jointed with a spray tube (2), and spray heads (21) are distributed in sequence and at equal intervals on the outer surface of the spray tube (2).

5. The tunnel support injection device according to claim 4, characterized in that: A gear three (23) is fixed at the joint of the injection pipe (2), and a limiting column (22) extends to one side in the upper area of ​​the gear three (23), and is fixedly connected to a limiting plate (143) located at the upper part of the outer peripheral surface of the rotating tube (14), and a limiting groove (144) is downwardly provided on one side of the upper surface of the limiting plate (143).

6. The tunnel support injection device according to claim 5, characterized in that: A crown gear (131) is fixed on one side of the outer surface of the swing tube (13), and a rotating frame (142) is extended on one side of the outer surface of the rotating tube (14). A rotating shaft (3) and a rotating shaft (32) are coaxially connected to the two rotating frames (142), and a gear (31) meshing with the crown gear (131) is fixed on one end of the rotating shaft (3).

7. The tunnel support injection device according to claim 6, characterized in that: A rotating sleeve (322) is fixed to the end of the rotating shaft 2 (32) opposite to the rotating shaft 1 (3). The rotating sleeve (322) is a hollow structure with one end open. The rotating sleeve (322) is sleeved on the outer peripheral surface of a rotating head (33) fixedly connected to one end of the rotating shaft 1 (3).

8. The tunnel support injection device according to claim 7, characterized in that: The inner ring wall of the rotating sleeve (322) is also provided with convex blocks (323) at equal intervals, and the outer circumferential surface of the rotating head (33) is provided with a telescopic groove (331) downwardly, and a limit block (332) capable of telescopic displacement is provided inside the telescopic groove (331), and a spring (333) is provided between the bottom of the limit block (332) and the bottom surface of the inner cavity of the telescopic groove (331), and a gear 2 (321) is fixed to the other end of the rotating shaft 2 (32), and the gear 2 (321) is meshedly connected with the gear 3 (23).

9. The tunnel support injection device according to claim 8, characterized in that: Both ends of the injection pipe (2) are respectively provided with a swing frame (4) that can be turned over, and at the same time, both ends of the swing frame (4) are provided with a rotating roller (42) that can rotate, and one end of one of the rotating rollers (42) is connected to a motor four (43), and pulleys (421) are respectively fixed at the other ends of the two rotating rollers (42), and a belt (422) is sleeved between the two pulleys (421).

10. The tunnel support injection device according to claim 9, characterized in that: A motor frame three (24) is fixed to one side of the bottom surface of the injection pipe (2), and a motor three (241) is fixed on the motor frame three (24), and a worm three (242) is connected to the power output end of the motor three (241), and a worm gear three (41) is fixed to one side of the surface of the swing frame (4) close to the worm gear three (242), and the worm gear three (41) is meshed and connected with the worm gear three (242).

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