Press-in lance sand flow regulation mechanism

Abstract

The utility model discloses a kind of press-in type spray gun sand flow regulating mechanism, it is related to sandblasting technical field, including sanding valve, the top of the sanding valve is provided with regulating mechanism, the regulating mechanism is used to adjust sandblasting flow, the outer wall of the sanding valve is provided with quick fixing mechanism, the quick fixing mechanism is used to quickly connect sand pipe, the regulating mechanism includes airflow valve shell, the airflow valve shell is fixed at the top of sanding valve, the inner wall upper end of the airflow valve shell is provided with fixed component, the bottom of the fixed component is provided with adjusting component, the bottom of the adjusting component is provided with rotating component, the bottom of the rotating component is provided with operating component.In the utility model, when adjusting spray gun sand flow, rotating rotating column makes rotating disc rotate, adjusting piece slides synchronous displacement in guide groove, leaves out middle space, the size of middle space is adjusted by controlling rotating disc angle, realizes sandblasting gun flow regulation.

Description

Technical Field

[0001] This utility model relates to the field of sandblasting technology, and in particular to a pressure-type sandblasting gun sand flow regulating mechanism. Background Technology

[0002] A sandblasting machine is a device that uses the impact of a high-speed sand stream to clean and roughen the surface of a substrate. It plays a crucial role in modern industrial production. Its main working principle is that, driven by compressed fluid, the abrasive material is propelled to impact the surface of the object to be treated in the form of a high-speed jet. The surface of the object can not only achieve specific cleanliness, smoothness, and roughness, but also improve its mechanical properties and fatigue resistance, laying a solid foundation for subsequent processes.

[0003] A search revealed a Chinese patent announcement number, CN208262620U, which discloses a sand flow adjustment mechanism for a sandblasting equipment. The mechanism includes: a mixing tank (1), a mixing shaft (2), a feeding screw (3), a supply channel (4), a conveying pipe (5), a sandblasting chamber (6), a spray gun device (7), an air compressor (8), a screen (9), a vibrator (10), and an inclined partition (11). This invention further filters the sand used for sandblasting by setting a screen, reducing the risk of sand clogging the spray gun nozzle. By setting a feeding motor and controlling the motor's rotation speed, the rotational speed of the feeding screw is adjusted to achieve the purpose of adjusting the sand supply. A vibrator is installed on the inclined partition to accelerate the sand feeding speed, ensuring uninterrupted sand supply. This sandblasting equipment is suitable for the fine processing of delicate surface components, meeting actual processing needs. However, the above structure cannot adjust the sandblasting volume during the sandblasting process, reducing the sandblasting efficiency of the sandblasting machine, increasing the frequency of switching on and off the sandblasting machine, increasing the workload of workers, and increasing the probability of errors. Utility Model Content

[0004] To overcome the above deficiencies, this utility model provides a pressure-type spray gun sand flow adjustment mechanism, which aims to improve the problem of not being able to adjust the sand flow during the sandblasting process.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a pressure-driven spray gun sand flow regulating mechanism, including a sanding valve, an regulating mechanism is provided on the top of the sanding valve, the regulating mechanism is used to regulate the sanding flow, and a quick-fixing mechanism is provided on the outer wall of the sanding valve, the quick-fixing mechanism is used to quickly connect the sand outlet pipe; The regulating mechanism includes an airflow valve housing, which is fixed to the top of the abrasive valve. A fixing component is provided at the upper end of the inner wall of the airflow valve housing, an regulating component is provided at the bottom of the fixing component, a rotating component is provided at the bottom of the regulating component, and an operating component is provided at the bottom of the rotating component.

[0006] The above technical solution includes a sandblasting valve with an adjustment mechanism installed at its top. The main function of this mechanism is to precisely control and adjust the sand flow rate during the sandblasting process, ensuring the stability and efficiency of the sandblasting operation. A quick-fixing mechanism is installed on the outer wall of the sandblasting valve, allowing for rapid and secure connection to the sand outlet pipe, simplifying the operation and improving work efficiency. The adjustment mechanism includes an airflow valve housing fixed to the top of the sandblasting valve, ensuring the stability of the entire adjustment mechanism. A fixing component is installed on the upper inner wall of the airflow valve housing, and an adjustment component is located at the bottom of the fixing component. This adjustment component is the core component for adjusting the sand flow rate, enabling precise control of the sandblasting flow. A rotating component is connected to the bottom of the adjustment component, transmitting and converting the operating force for smoother adjustment. An operating component is located at the bottom of the rotating component, allowing for convenient and quick adjustment of the sandblasting flow rate to meet the needs of different working conditions.

[0007] As a further description of the above technical solution: The quick-fixing mechanism includes a connecting pipe disposed on the outer wall of the abrasive valve, an outer ring fixedly connected to the outer wall of the abrasive valve, a groove opened on the outer wall of the outer ring, a clamping ring disposed on the inner wall of the outer ring, a lever assembly disposed on the outer wall of the clamping ring, a pressure assembly disposed at the other end of the lever assembly, and a threaded rod disposed in the middle of the pressure assembly.

[0008] The above technical solution includes a quick-fixing mechanism comprising a connecting pipe, which is installed on the outer wall of the abrasive valve to ensure a tight fit with the abrasive valve. An outer ring is fixed to the outer wall of the abrasive valve by a robust connection. A slot is provided on the outer wall of the outer ring, and a clamping ring is provided on the inner wall of the outer ring. The main function of the clamping ring is to provide a stable clamping force. A lever assembly is installed on the outer wall of the clamping ring. The lever assembly allows for flexible operation. A pressure assembly is provided at the other end of the lever assembly, and a threaded rod is provided in the middle of the pressure assembly.

[0009] As a further description of the above technical solution: The fixing component includes a fixing plate, which is fixed to the inner wall of the airflow valve housing, and the top surface of the fixing plate is provided with a plurality of guide grooves.

[0010] The above technical solution includes a fixing plate, which is installed on the inner wall of the airflow valve housing to ensure that it will not be displaced during use. The top surface of the fixing plate is provided with multiple guide grooves.

[0011] As a further description of the above technical solution: The adjustment assembly includes an adjustment plate, which is disposed at the bottom of the fixed plate. An upper fixing post is fixedly connected to the middle of the top surface of the adjustment plate, and a lower fixing post is fixedly connected to one end of the bottom of the adjustment plate.

[0012] The above technical solution involves an adjustment component consisting of an adjustment plate, which is located at the bottom of a fixed plate. An upper fixing stake is fixedly connected to the center of the top surface of the adjustment plate for positioning. A lower fixing stake is fixedly connected to one end of the bottom of the adjustment plate, and its function is similar to that of the upper fixing stake, both ensuring the stability and precise adjustment of the adjustment plate.

[0013] As a further description of the above technical solution: The rotating assembly includes a rotating disk, the outer wall of which is rotatably connected to the inner wall of the airflow valve housing, and a guide groove is provided on the top of the rotating disk.

[0014] Through the above technical solution: the rotating component includes a rotating disk, the outer wall of the rotating disk is rotatably connected to the inner wall of the airflow valve housing, so that the rotating disk can rotate freely in the airflow valve housing. The top of the rotating disk is provided with a second guide groove, which cooperates with the first guide groove on the fixed plate to guide and position the adjustment component.

[0015] As a further description of the above technical solution: The operating component includes meshing teeth, which are fixed to the bottom of the rotating disk. A rotating column is rotatably connected to the outer wall of the airflow valve housing. A bevel gear is fixedly connected to one end of the rotating column, and the outer wall of the bevel gear meshes with the outer wall of the meshing teeth.

[0016] The above technical solution includes a meshing tooth fixed at the bottom of the rotating disk to ensure that it will not be displaced during operation. A rotating column is rotatably connected to the outer wall of the airflow valve housing. One end of the rotating column is connected to a bevel gear through a fixed connection. The outer wall of the bevel gear and the outer wall of the meshing tooth form a meshing connection, thereby realizing the function of rotation transmission.

[0017] As a further description of the above technical solution: The lever assembly includes a connecting rod, one end of which is rotatably connected to the outer wall of the pressure ring, and a fixing post is fixedly connected to the middle of the connecting rod, with both ends of the fixing post rotatably connected to the inner wall of the outer ring.

[0018] Through the above technical solution: the lever assembly is mainly composed of a connecting rod. One end of the connecting rod is connected to the outer wall of the pressure ring by a rotating connection to ensure flexible rotation during operation. A fixed column is fixedly connected to the middle of the connecting rod. The two ends of the fixed column are respectively connected to the inner wall of the outer ring by a rotating connection to maintain the stability and flexibility of the entire lever assembly.

[0019] As a further description of the above technical solution: The pressure assembly includes a movable rod, one end of which is rotatably connected to one end of a connecting rod, and the other end of which is rotatably connected to a threaded sleeve, the inner wall of which is threadedly connected to the outer wall of the threaded rod.

[0020] The above technical solution includes a movable rod, one end of which is rotatably connected to one end of a connecting rod to ensure coordinated operation. The other end of the movable rod is rotatably connected to a threaded sleeve, the inner wall of which is connected to the outer wall of the threaded rod via a threaded connection, thereby achieving precise adjustment and control of the pressure.

[0021] This utility model has the following beneficial effects: 1. In this utility model, when adjusting the sand flow rate of the spray gun, the rotating column is rotated to make the rotating disk rotate, and the adjusting plate slides synchronously in the guide groove to leave a central space. The size of the central space is adjusted by controlling the angle of the rotating disk, thereby realizing the adjustment of the sandblasting gun flow rate.

[0022] 2. In this utility model, the sand outlet pipe is sleeved on the outer wall of the connecting pipe, and the threaded sleeve is connected to the threaded rod for displacement. When the threaded sleeve is displaced, the movable rod pushes one end of the connecting rod, and the connecting rod rotates around the fixed column. The other end pushes the clamping ring, and the clamping ring squeezes out the outer wall of the sand outlet pipe and fixes it to the outer wall of the connecting pipe, thus achieving quick and stable installation. Attached Figure Description

[0023] Figure 1 This is a perspective view of a pressure-type spray gun sand flow adjustment mechanism proposed in this utility model.

[0024] Figure 2 This is a partial structural exploded view of the airflow valve housing of a pressure-type spray gun sand flow regulating mechanism proposed in this utility model.

[0025] Figure 3 This is a partial structural exploded view of the regulating component of the pressurized spray gun sand flow regulating mechanism proposed in this utility model.

[0026] Figure 4 This is a partial structural diagram of the operating component of the pressure-type spray gun sand flow adjustment mechanism proposed in this utility model.

[0027] Figure 5This is a partial structural exploded view of the quick-fixing mechanism of the pressure-type spray gun sand flow adjustment mechanism proposed in this utility model.

[0028] Figure 6 This is a partial structural schematic diagram of a lever assembly for a pressure-type spray gun sand flow regulating mechanism proposed in this utility model.

[0029] Explanation of reference numerals in the attached figures: 1. Scrubber valve; 2. Adjusting mechanism; 201. Airflow valve housing; 202. Fixing assembly; 2021. Fixing plate; 2022. Guide groove one; 203. Adjusting assembly; 2031. Adjusting plate; 2032. Upper fixing post; 2033. Lower fixing post; 204. Rotating assembly; 2041. Rotating disc; 2042. Guide groove two; 205. Operating assembly; 2051. Meshing gear; 2052. Bevel gear; 2053. Rotating column; 3. Quick fixing mechanism; 301. Connecting pipe; 302. Outer ring; 303. Slotted; 304. Lever assembly; 3041. Connecting rod; 3042. Fixing column; 305. Pressure ring; 306. Pressure assembly; 3061. Movable rod; 3062. Threaded sleeve; 307. Threaded rod. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] Reference Figure 1 - Figure 3 An embodiment of this utility model is provided: a pressure-type spray gun sand flow regulating mechanism, including a sanding valve 1, an regulating mechanism 2 is provided on the top of the sanding valve 1, the regulating mechanism 2 is used to regulate the sanding flow, and a quick fixing mechanism 3 is provided on the outer wall of the sanding valve 1, the quick fixing mechanism 3 is used to quickly connect the sand outlet pipe. The regulating mechanism 2 includes an airflow valve housing 201, which is fixed to the top of the abrasive valve 1. A fixing component 202 is provided at the upper end of the inner wall of the airflow valve housing 201, an regulating component 203 is provided at the bottom of the fixing component 202, a rotating component 204 is provided at the bottom of the regulating component 203, and an operating component 205 is provided at the bottom of the rotating component 204. Specifically, the device includes a sandblasting valve 1, with an adjusting mechanism 2 installed at its top. The main function of the adjusting mechanism 2 is to precisely control and adjust the sand flow rate during the sandblasting process to ensure the stability and efficiency of the sandblasting operation. A quick-fixing mechanism 3 is provided on the outer wall of the sandblasting valve 1. The main function of the quick-fixing mechanism 3 is to quickly and securely connect the sand outlet pipe, thereby simplifying the operation process and improving work efficiency. The adjusting mechanism 2 includes an airflow valve housing 201, which is fixed to the top of the sandblasting valve 1 to ensure the stability of the entire adjusting mechanism 2. To ensure stability, a fixing component 202 is installed on the upper inner wall of the airflow valve housing 201. An adjusting component 203 is set at the bottom of the fixing component 202. The adjusting component 203 is the core component for adjusting the sand flow rate, which can achieve precise control of the sandblasting flow rate. The bottom of the adjusting component 203 is connected to a rotating component 204. The function of the rotating component 204 is to transmit and convert the operating force, making the adjustment process smoother. An operating component 205 is set at the bottom of the rotating component 204, which can conveniently and quickly adjust the sandblasting flow rate to meet the needs of different working conditions.

[0032] Reference Figure 4 - Figure 6 The quick-fixing mechanism 3 includes a connecting pipe 301 disposed on the outer wall of the abrasive valve 1. An outer ring 302 is fixedly connected to the outer wall of the abrasive valve 1. A groove 303 is opened on the outer wall of the outer ring 302. A clamping ring 305 is disposed on the inner wall of the outer ring 302. A lever assembly 304 is disposed on the outer wall of the clamping ring 305. A pressure assembly 306 is disposed at the other end of the lever assembly 304. A threaded rod 307 is disposed in the middle of the pressure assembly 306. Specifically, the quick-fixing mechanism 3 includes a connecting pipe 301, which is installed on the outer wall of the abrasive valve 1 to ensure a tight fit with the abrasive valve 1. An outer ring 302 is fixed to the outer wall of the abrasive valve 1 by a robust connection. A slot 303 is provided on the outer wall of the outer ring 302. A clamping ring 305 is provided on the inner wall of the outer ring 302. The main function of the clamping ring 305 is to provide a stable clamping force. A lever assembly 304 is installed on the outer wall of the clamping ring 305. The lever assembly 304 allows for flexible operation. A pressure assembly 306 is provided at the other end of the lever assembly 304. A threaded rod 307 is provided in the middle of the pressure assembly 306.

[0033] Reference Figure 1 - Figure 3The fixing component 202 includes a fixing plate 2021, which is fixed to the inner wall of the airflow valve housing 201. The top surface of the fixing plate 2021 is provided with a plurality of guide grooves 2022. The adjusting component 203 includes an adjusting plate 2031, which is disposed at the bottom of the fixing plate 2021. An upper fixing post 2032 is fixedly connected to the middle of the top surface of the adjusting plate 2031, and a lower fixing post 2033 is fixedly connected to one end of the bottom of the adjusting plate 2031. The rotating component 204 includes a rotating disk 2041, the outer wall of which is rotatably connected to the inner wall of the airflow valve housing 201. The top of the rotating disk 2041 is provided with a guide groove 2042. Specifically, the fixing component 202 includes a fixing plate 2021, which is installed on the inner wall of the airflow valve housing 201 to ensure that it will not shift during use. The top surface of the fixing plate 2021 has multiple guide grooves 2022. The adjusting component 203 mainly consists of an adjusting piece 2031, which is located at the bottom of the fixing plate 2021. An upper fixing post 2032 is fixedly connected to the center of the top surface of the adjusting piece 2031 for positioning. A bottom end of the adjusting piece 2031 is fixedly connected to... A lower fixed stake 2033 has a similar function to the upper fixed stake 2032, which together ensures the stability and precise adjustment of the adjusting plate 2031. The rotating component 204 includes a rotating disk 2041. The outer wall of the rotating disk 2041 is rotatably connected to the inner wall of the airflow valve housing 201, so that the rotating disk 2041 can rotate freely within the airflow valve housing 201. A second guide groove 2042 is provided on the top of the rotating disk 2041. The second guide groove 2042 cooperates with the first guide groove 2022 on the fixed plate 2021 to guide and position the adjusting component 203.

[0034] Reference Figure 3 - Figure 5 The operating component 205 includes a meshing tooth 2051, which is fixed to the bottom of the rotating disk 2041. A rotating column 2053 is rotatably connected to the outer wall of the airflow valve housing 201. A bevel gear 2052 is fixedly connected to one end of the rotating column 2053. The outer wall of the bevel gear 2052 meshes with the outer wall of the meshing tooth 2051. The lever component 304 includes a connecting rod 3041, one end of which is rotatably connected to the outer wall of the clamping ring 305. A fixed column 3042 is fixedly connected to the middle of the connecting rod 3041. Both ends of the fixed column 3042 are rotatably connected to the inner wall of the outer ring 302. The pressure component 306 includes a movable rod 3061, one end of which is rotatably connected to one end of the connecting rod 3041. A threaded sleeve 3062 is rotatably connected to the other end of the movable rod 3061. The inner wall of the threaded sleeve 3062 is threadedly connected to the outer wall of the threaded rod 307. Specifically, the operating component 205 includes a meshing tooth 2051, which is fixed to the bottom of the rotating disk 2041 to ensure no displacement during operation. A rotating column 2053 is rotatably connected to the outer wall of the airflow valve housing 201. One end of the rotating column 2053 is connected to a bevel gear 2052 via a fixed connection. The outer wall of the bevel gear 2052 and the outer wall of the meshing tooth 2051 form a meshing connection, thereby realizing the function of rotational transmission. The lever assembly 304 is mainly composed of a connecting rod 3041, one end of which is rotatably connected to the outer wall of the pressure ring 305 to ensure flexible rotation during operation. The lever assembly 304 has a fixed post 3042 fixedly connected to the middle of the connecting rod 3041. The two ends of the fixed post 3042 are respectively connected to the inner wall of the outer ring 302 by a rotating connection to maintain the stability and flexibility of the entire lever assembly 304. The pressure assembly 306 includes a movable rod 3061. One end of the movable rod 3061 is connected to one end of the connecting rod 3041 by a rotating connection to ensure coordinated action during operation. The other end of the movable rod 3061 is rotatably connected to a threaded sleeve 3062. The inner wall of the threaded sleeve 3062 is connected to the outer wall of the threaded rod 307 by a threaded connection, thereby realizing precise adjustment and control of pressure.

[0035] Working principle: When the sandblasting gun flow rate needs to be adjusted, the rotating column 2053 is rotated. The bevel gear 2052 fixed at the other end of the rotating column 2053 meshes with the meshing teeth 2051 set at the bottom of the rotating disk 2041. That is, the rotating disk 2041 rotates, the lower fixed stake 2033 at the bottom of the adjusting plate 2031 slides in the second guide groove 2042, and the upper fixed stake 2032 at the top of the adjusting plate 2031 slides in the inner wall of the first guide groove 2022 opened on the outer wall of the fixed plate 2021. This causes multiple adjusting plates 2031 to move synchronously. The multiple adjusting plates 2031 are staggered to leave a central space for airflow. By controlling the rotation angle of the rotating disk 2041, the displacement of the adjusting plate 2031 can be controlled, thereby adjusting the area of ​​the central space and thus adjusting the flow rate of the sandblasting gun. When installing the sand outlet pipe, one end of the sand outlet pipe is fitted onto the outer wall of the connecting pipe 301, and then the threaded rod 307 is rotated. One end of the threaded rod 307 is set on the outer wall of the outer ring 302. The threaded sleeve 3062 is threadedly connected to the threaded rod 307, that is, the threaded sleeve 3062 moves along the outer wall of the threaded rod 307. The middle part of the connecting rod 3041 is rotatably connected to the inner wall of the slot 303 through the fixed column 3042. When the threaded sleeve 3062 moves along the threaded rod 307, the movable rod 3061 pushes one end of the connecting rod 3041, so that the connecting rod 3041 rotates around the fixed column 3042. The other end of the connecting rod 3041 pushes the clamping ring 305. The inner wall of the clamping ring 305 squeezes the outer wall of the sand outlet pipe, and fixes the sand outlet pipe firmly on the outer wall of the connecting pipe 301, thus achieving a quick and stable installation of the sand outlet pipe.

[0036] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A pressure-driven spray gun sand flow regulating mechanism, comprising a sanding valve (1), characterized in that: The top of the sandblasting valve (1) is provided with an adjustment mechanism (2), which is used to adjust the sandblasting flow rate. The outer wall of the sandblasting valve (1) is provided with a quick fixing mechanism (3), which is used to quickly connect the sand outlet pipe. The regulating mechanism (2) includes an airflow valve housing (201), which is fixed to the top of the abrasive valve (1). A fixing component (202) is provided on the upper end of the inner wall of the airflow valve housing (201). An regulating component (203) is provided at the bottom of the fixing component (202). A rotating component (204) is provided at the bottom of the regulating component (203). An operating component (205) is provided at the bottom of the rotating component (204).

2. The pressure-feed spray gun sand flow regulating mechanism according to claim 1, characterized in that: The quick-fixing mechanism (3) includes a connecting pipe (301) disposed on the outer wall of the abrasive valve (1), an outer ring (302) fixedly connected to the outer wall of the abrasive valve (1), a groove (303) being provided on the outer wall of the outer ring (302), a pressing ring (305) being provided on the inner wall of the outer ring (302), a lever assembly (304) being provided on the outer wall of the pressing ring (305), a pressure assembly (306) being provided at the other end of the lever assembly (304), and a threaded rod (307) being provided in the middle of the pressure assembly (306).

3. The pressure-feed spray gun sand flow regulating mechanism according to claim 1, characterized in that: The fixing component (202) includes a fixing plate (2021), which is fixed to the inner wall of the airflow valve housing (201). The top surface of the fixing plate (2021) is provided with a plurality of guide grooves (2022).

4. The pressure-feed spray gun sand flow regulating mechanism according to claim 3, characterized in that: The adjustment component (203) includes an adjustment piece (2031), which is disposed at the bottom of the fixed plate (2021). An upper fixed stake (2032) is fixedly connected to the middle of the top surface of the adjustment piece (2031), and a lower fixed stake (2033) is fixedly connected to one end of the bottom of the adjustment piece (2031).

5. The pressure-feed spray gun sand flow regulating mechanism according to claim 1, characterized in that: The rotating assembly (204) includes a rotating disk (2041), the outer wall of which is rotatably connected to the inner wall of the airflow valve housing (201), and a guide groove (2042) is provided on the top of the rotating disk (2041).

6. The pressure-feed spray gun sand flow regulating mechanism according to claim 5, characterized in that: The operating component (205) includes a meshing tooth (2051), which is fixed to the bottom of the rotating disk (2041). A rotating column (2053) is rotatably connected to the outer wall of the airflow valve housing (201). A bevel gear (2052) is fixedly connected to one end of the rotating column (2053). The outer wall of the bevel gear (2052) meshes with the outer wall of the meshing tooth (2051).

7. The pressure-feed spray gun sand flow regulating mechanism according to claim 2, characterized in that: The lever assembly (304) includes a connecting rod (3041), one end of which is rotatably connected to the outer wall of the clamping ring (305), and a fixing post (3042) is fixedly connected to the middle of the connecting rod (3041), and both ends of the fixing post (3042) are rotatably connected to the inner wall of the outer ring (302).

8. The pressure-feed spray gun sand flow regulating mechanism according to claim 7, characterized in that: The pressure assembly (306) includes a movable rod (3061), one end of which is rotatably connected to one end of a connecting rod (3041), and the other end of which is rotatably connected to a threaded sleeve (3062), the inner wall of which is threadedly connected to the outer wall of a threaded rod (307).

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