Fertilizer distributor for mixed fertilizer

Abstract

The utility model discloses a mixed fertilizer applicator which comprises a material box, the material box is arranged on a tractor or a traction rack, an opening in the upper end of the material box forms a feeding port, at least one discharging port is formed in the lower end of the material box, the discharging ports extend in the transverse direction to be in a strip shape, and the at least one discharging port is evenly arranged in the transverse direction. The distance between every two adjacent discharging openings is smaller than the transverse length of the discharging openings. The device further comprises a sliding plate and a controller, the sliding plate, the controller and the discharging opening are used in pairs, the sliding plate is slidably connected to the discharging opening, and the controller is connected with the sliding plate to pull the sliding plate to move under the action of external force. The bottom of the feed box is provided with the strip-shaped feed openings, the at least one feed opening is uniformly arranged along the transverse direction, and the distance between the two adjacent feed openings is smaller than the transverse length of the feed opening, so that a dotted line-shaped opening structure is formed, fertilizer in the feed box falls and is scattered on the ground in a planar manner through the feed openings, and the uniform spreading of the fertilizer is facilitated.

Description

Technical Field

[0001] This utility model relates to the field of planting technology, and in particular to a mixed fertilizer applicator. Background Technology

[0002] With the development of planting technology, its functions and applications are becoming more and more complete, gradually covering all planting operations, such as tilling, ditching, fertilizing, sowing, covering with soil and mulching.

[0003] For example, in the Chinese patent document "A trenching, fertilizing and soil covering device for crop planting, publication number CN218735867U", the upper end of the support is provided with a storage trough with an opening at the top, and the lower end of the storage trough has a discharge port on both the left and right sides. The size of the discharge port can be adjusted by adjusting the sliding plate, thereby adjusting the falling speed of the fertilizer.

[0004] For example, the Chinese patent document "Hydraulic Vibratory Deep Tillage Combined Land Preparation Machine, Publication No. CN109104922A" has multiple fertilizer discharge devices evenly distributed at the bottom of the fertilizer tank. The fertilizer discharge devices can be controlled to apply the fertilizer in the fertilizer tank into the soil through the fertilizer delivery pipe and the fertilizer ditch opener, which makes it easy to control the flow rate and speed of fertilizer application.

[0005] As mentioned above, most fertilizer applicators apply fertilizer in fertilizer trenches and cannot spread it over a surface, making them unsuitable for applying mixed fertilizers that improve soil, such as lime powder and magnesium sulfate powder. Utility Model Content

[0006] The purpose of this invention is to address the above-mentioned problems by providing a corrosion-resistant and high-temperature-resistant mixed fertilizer applicator with a strip-shaped opening that allows for the application of fertilizer in a surface manner.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0008] A mixed fertilizer applicator includes a feed hopper mounted on a tractor or traction frame. The upper opening of the feed hopper forms a feed inlet, and the lower end of the feed hopper has at least one discharge port. The discharge ports extend laterally in a strip shape, and the at least one discharge port is evenly distributed laterally, with the distance between two adjacent discharge ports being less than the lateral length of the discharge port. The applicator also includes a slide plate and a controller. The slide plate and controller are used in pairs with the discharge ports. The slide plate is slidably connected to the discharge port, and the controller is connected to the slide plate to pull the slide plate to move under the action of an external force.

[0009] Magnesium sulfate powder loses water and generates heat at high temperatures. To make the bin corrosion-resistant and high-temperature resistant, the bottom wall and all four side walls of the bin are made of stainless steel, such as stainless steel sheet or stainless steel plate.

[0010] The horizontal length of the discharge port is greater than 20cm, and the distance between two adjacent discharge ports is less than 5cm.

[0011] The controller is a throttle cable controller. The wheel of the throttle cable controller is located in the tractor's cab, and the end of the throttle cable controller is bolted to the slide plate.

[0012] It also includes linear bearing kits, with two linear bearing kits configured for each discharge port. The two linear bearing kits are arranged evenly in the transverse direction at the discharge port. The linear shaft of the linear bearing kit is fixedly connected to the material box, and the bearing of the linear bearing kit is fixedly connected to the slide plate.

[0013] As mentioned above, a strip-shaped discharge port is opened at the bottom of the material box, with at least one discharge port evenly arranged in the horizontal direction, and the distance between two adjacent discharge ports is less than the horizontal length of the discharge port. In this way, a dotted line opening structure is formed, so that the fertilizer in the material box falls and spreads out in a surface shape on the ground through the discharge port, which is conducive to the even application of fertilizer.

[0014] Based on the aforementioned solution, in an improved version, to achieve a detachable connection to the feed hopper, the fertilizer applicator also includes a support frame. One end of the support frame is located on the inner outer wall of the feed hopper, and the other end of the support frame has a support hole for bolt connection to the front bumper or rear towing seat of the tractor. Thus, it can be specifically mounted on a tractor for surface fertilizer application, or mounted on a towing frame and the opening and closing of the discharge port can be adjusted to apply fertilizer in the fertilizer trench.

[0015] Based on the aforementioned solution, in an improved solution, in order to observe the amount of fertilizer falling and its spread in real time, the discharge port is located at the bottom end of the inner outer wall of the hopper, and the slide plate can slide up and down to connect to the discharge port. The operator can see the amount of fertilizer falling and its spread on the ground from the tractor; the bottom wall of the hopper slopes downward from the outside to the inside so that the fertilizer falls downward.

[0016] Based on the aforementioned solution, in an improved version, to better constrain the sidewalls of the sliding plate on the lightweight material bin, the fertilizer applicator also includes a seat plate. The inner sidewall of the material bin is thin-skinned, and the seat plate is positioned above the discharge port on the inner outer wall of the material bin. The seat plate is located between the inner outer wall of the material bin and the sliding plate, and frame plates extend downward from both sides of the seat plate corresponding to each discharge port. This forms a door-frame-like limiting structure to constrain the sliding plate and slide it, creating a better seal and facilitating better fertilizer loading and spreading.

[0017] Based on the aforementioned solution, in an improved solution, to better limit the sliding direction and position of the slide plate, the fertilizer applicator further includes an upper positioning rod. The upper positioning rod extends laterally and is disposed on the inner outer wall of the material box. The upper positioning rod is positioned above the slide plate. When the slide plate slides upwards, its upper end approaches the upper positioning rod; when the slide plate slides downwards, its lower end approaches and can abut against the bottom wall of the material box. This limits the sliding direction of the slide plate, preventing excessive movement. In a preferred embodiment, a spring connects the upper positioning rod and the slide plate. The spring is in a natural state or a compressed state when the slide plate covers the discharge port. Thus, the restoring force of the spring is directed downwards (slide plate closed position), which can cause the slide plate to move towards the closed position, thereby closing the slide plate or making the slide plate more stable in the open state.

[0018] Based on the aforementioned solution, in an improved version, to facilitate the disassembly and assembly of the controller, the fertilizer applicator also includes a locking component. The locking component includes a sleeve rod and a locking bolt. One end of the sleeve rod has a locking hole, and the other end is connected to the inner wall of the sliding plate. A radially penetrating through hole is provided on the bottom wall of the locking hole of the sleeve rod. The end of the throttle cable controller's cable is engaged in the through hole, and the locking hole is threaded with a locking bolt. Thus, by threading the controller cable through and engaging it in the through hole, and then tightening the locking bolt, assembly and disassembly are easily achieved.

[0019] By adopting the above technical solution, this utility model has the following beneficial effects:

[0020] The mixed fertilizer applicator of this utility model has a strip-shaped discharge port at the bottom of the material box. At least one discharge port is evenly arranged in the horizontal direction, and the distance between two adjacent discharge ports is less than the horizontal length of the discharge port. In this way, a dotted line opening structure is formed, so that the fertilizer in the material box falls and spreads out in a surface shape on the ground through the discharge port, which is conducive to the even application of fertilizer. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of Example 1 of the fertilizer applicator of this utility model.

[0022] Figure 2 yes Figure 1 A magnified view of a portion of the image.

[0023] Figure 3 yes Figure 1 A partial structural diagram of the throttle cable controller.

[0024] Figure 4 yes Figure 1 A side view of the material bin.

[0025] Figure 5 yes Figure 4 A structural diagram.

[0026] Figure 6yes Figure 5 A magnified view of a portion of the image.

[0027] Figure 7 yes Figure 4 Another perspective structural diagram.

[0028] Figure 8 yes Figure 4 Another perspective structural diagram.

[0029] Figure 9 yes Figure 8 Enlarged view of the linear bearing connection.

[0030] Figure 10 yes Figure 8 Enlarged view of the locking component connection.

[0031] Figure 11 yes Figure 8 Enlarged view of another linear bearing connection.

[0032] Figure 12 yes Figure 4 A schematic diagram of the internal structure.

[0033] Figure 13 yes Figure 12 A magnified view of a portion of the image.

[0034] Figure 14 This is a schematic diagram of the structure of Example 2 of this utility model.

[0035] In the attached diagram, 100 is a tractor, 200 is a fertilizer applicator, 1 is a hopper, 11 is a discharge port, 12 is a feed port, 13 is a lower positioning plate, 2 is an upper ring rod, 21 is a lower ring rod, 22 is an upper positioning rod, 3 is a support frame, 301 is a support hole, 31 is a diagonal rod, 4 is a sliding plate, 41 is a seat plate, 5 is a linear bearing assembly, 6 is a throttle cable controller, 61 is a cable sleeve, 62 is a sleeve base, 63 is a cable core, and 64 is a locking component. Detailed Implementation

[0036] Example 1

[0037] See Figure 1 The tractor is positioned in front of the traction frame, which is the front-to-back direction. Correspondingly, its left and right sides are the lateral directions. With the center of the tractor, the front-to-back direction is divided into inner and outer sides.

[0038] See Figures 1-13The mixed fertilizer applicator of this embodiment 1 includes a feed box 1, which is mounted on a tractor 100 or a traction frame. The upper opening of the feed box 1 forms a feed inlet 13, and the lower end of the feed box 1 is provided with at least one discharge port 11. The discharge port 11 extends laterally in a strip shape, and the at least one discharge port 11 is evenly arranged laterally, and the distance between two adjacent discharge ports is less than the lateral length of the discharge port. It also includes a slide plate 4 and a controller. The slide plate 4 and the controller are used in pairs with the discharge port 11. The slide plate 4 is slidably connected to the discharge port 11, and the controller is connected to the slide plate to pull the slide plate to move under the action of external force.

[0039] Among them, the tractor (tractor) and tractor frame and other planting equipment are existing equipment. This application improves the fertilizer box and connecting structure of the fertilizer applicator, which can be installed on the front bumper of the tractor head or the rear side plate of the machine body, the rear traction seat, etc. This application takes the installation on the front bumper of the tractor as an example.

[0040] The material bin 1 can be configured as an open-top box structure, with a round bottom, a flat box, or a rectangular box, an elliptical bottom box, or a sloping platform box, etc., as needed. Its top surface is flush with the machine head or within 20cm above it, so as to load fertilizer.

[0041] Mixed fertilizers such as lime powder and magnesium sulfate powder may corrode the hopper. For example, magnesium sulfate powder loses water and generates heat at high temperatures, and if a plastic hopper is used, it will quickly corrode. To make the hopper corrosion-resistant and high-temperature resistant, the bottom wall and all four side walls of the hopper are made of stainless steel, such as stainless steel sheet or stainless steel plate.

[0042] As shown in the figure, taking a thin-skinned material box as an example, in order to support the thin-skinned material box, an upper ring rod 2 and a lower ring rod 21 are welded on the outside of the material box, and a welded vertical rod is configured to connect them. In order to stably support the feeding, a welded feeding ring rod is configured at the feeding port.

[0043] The discharge port can be located on the bottom wall of the hopper, or on the inner or outer side wall of the hopper. For example... Figures 1-13 As shown, taking discharge port 1 as an example, the horizontal length of the discharge port is greater than 20cm, and the distance between two adjacent discharge ports is less than 5cm. As shown in the figure, taking a sloping box shape as an example, the wall thickness of the thin plate is 0.1 or 0.2cm; the horizontal length of the inner side wall vertical plate is 200cm, and the vertical width is 50cm; the horizontal length of the bottom wall sloping plate is 200cm, and the sloping width is 75cm; the vertical width (height) of the discharge port is 3cm, and the horizontal length is 194cm; the wall thickness of the sliding plate is 1-3cm, and the height is 5-10cm.

[0044] The controller is a throttle cable controller. The wheel of the throttle cable controller is arranged in the tractor's cab, and the end of the cable is bolted to the slide plate. The throttle cable controller 6 includes a wheel, a cable sleeve 61, a sleeve base 62 (welded to the lower ring rod 21), and a cable core 63, etc. The throttle cable controller is an existing device, and this application uses it as a control structure for manually controlling the size of the feed port opening.

[0045] The fertilizer applicator also includes a linear bearing assembly 5. Each discharge port is equipped with two linear bearing assemblies 5. The two linear bearing assemblies 5 are evenly arranged laterally at the discharge port 11. The linear bearing assembly is an existing device. The linear shaft of the linear bearing assembly 5 is fixedly connected to the material box 1, and the bearing bolts of the linear bearing assembly 5 are fixedly connected to the slide plate 4, so that the slide plate slides along the linear shaft (sliding up and down on the inner and outer walls, or sliding back and forth on the bottom wall).

[0046] As mentioned above, during use, the slide plate is pulled by the throttle cable controller, thereby adjusting the position of the slide plate and thus adjusting the size of the discharge port opening.

[0047] As mentioned above, a strip-shaped discharge port is opened at the bottom of the material box, with at least one discharge port evenly arranged in the horizontal direction, and the distance between two adjacent discharge ports is less than the horizontal length of the discharge port. In this way, a dotted line opening structure is formed, so that the fertilizer in the material box falls and spreads out in a surface shape on the ground through the discharge port, which is conducive to the even application of fertilizer.

[0048] Example 2

[0049] Compared with the aforementioned Embodiment 1, Embodiment 2 has a different sliding connection structure, as detailed below.

[0050] See Figures 1-13 One approach is to replace the linear bearing assembly with a pulley sliding connection structure, installing U-shaped sleeves on the left and right sides of the slide plate on the material box, and installing pulleys on the left and right side walls of the slide plate, thereby allowing the slide plate to slide smoothly connected to the material box. Another approach is to replace the linear bearing assembly with a ball bearing slide connection structure, such as common drawer slide hardware, to slide the slide plate smoothly connected to the material box.

[0051] Example 3

[0052] This embodiment 3 is an improvement on the aforementioned embodiment 1 or embodiment 2, and has a detachable connection structure. For other details not covered herein, please refer to the aforementioned embodiment 1 and embodiment 2.

[0053] See Figures 1-13To enable a detachable connection to the feed bin, the fertilizer applicator also includes a support frame 3. One end of the support frame 3 is located on the inner outer wall of the feed bin 1, and the other end of the support frame 3 has a support hole 301 for bolt connection to the front bumper 101 or rear towing seat of the tractor 100. To enhance the connection strength, a welded diagonal rod 31 is provided. Thus, it can be specifically mounted on a tractor for surface fertilizer application, or mounted on a towing frame and the opening and closing of the discharge port can be adjusted for fertilizer application in fertilization trenches.

[0054] Example 4

[0055] This embodiment 4 is an improvement on the aforementioned embodiments 1-3, and features real-time observation of the material feeding structure. For other details not covered herein, please refer to the aforementioned embodiments 1-3.

[0056] See Figures 1-13 In order to observe the amount of fertilizer falling and its spread in real time, the discharge port 11 is set at the bottom end of the inner outer wall of the material box 1. The slide plate 4 can slide up and down and is connected to the discharge port 11. The operator can see the amount of fertilizer falling and its spread on the ground from the tractor.

[0057] Based on the aforementioned examples, in a preferred embodiment, the bottom wall of the feed hopper 1 slopes downwards from the outside to the inside, as shown in the figure, forming a sloping platform structure so that the fertilizer falls downwards. Of course, for feed hoppers with a very high height, the lower bottom wall is sloped, and the upper end can adopt a cylindrical or rectangular surface structure, thereby having a larger volume and increasing the amount of fertilizer that can be placed.

[0058] Example 5

[0059] This embodiment 5 is an improvement on the aforementioned embodiments 1-4, and has a movable limiting structure. For other details not covered herein, please refer to the aforementioned embodiments 1-4.

[0060] See Figures 1-13 To better limit the sliding direction and position of the slide plate, the fertilizer applicator also includes an upper positioning rod 22. The upper positioning rod 22 extends laterally and is disposed on the inner outer wall of the material box 1, positioned above the slide plate 4. When the slide plate 4 slides upward, its upper end approaches the upper positioning rod 22; when the slide plate 4 slides downward, its lower end approaches and abuts against the bottom wall of the material box 1. As shown in the figure, to improve the strength of the thin-walled box, the upper positioning rod is extended axially to form a ring structure. This limits the sliding direction of the slide plate, preventing excessive movement.

[0061] Example 6

[0062] This embodiment 6 is an improvement on the aforementioned embodiments 1-5, and has a side limiting structure. For other details not covered herein, please refer to the aforementioned embodiments 1-5.

[0063] See Figures 1-13To better constrain the sidewalls of the sliding plate on the lightweight material box, the fertilizer applicator also includes a seat plate 41. The inner wall of the material box 1 is thin-skinned, and the seat plate 41 is positioned above the discharge port 11 on the inner outer wall of the material box 1. The seat plate 41 is located between the inner outer wall of the material box 1 and the sliding plate 4, and frame plates extend downward from both sides of the seat plate 41 corresponding to each discharge port. This forms a door frame-like limiting structure to constrain the sliding plate and slide it, creating a better seal and preventing gaps from forming due to deformation of the thin-skinned box, which would cause fertilizer leakage, thus better holding and spreading fertilizer.

[0064] Additionally, as shown in the figure, an example of a linear shaft connection is given. The two ends of the linear shaft are respectively connected to the upper positioning rod 22 and the bottom wall of the material box 1 through supports. The lower end of the linear shaft is connected at the lower positioning plate 13. The lower positioning plate is used to strengthen the connection strength of the opening of the bottom wall of the thin-skinned box, so that the sliding plate and the bottom wall have better contact performance and avoid deformation that could cause gaps and fertilizer leakage.

[0065] Example 7

[0066] This embodiment 7 is an improvement on the aforementioned embodiments 1-6, and has a side limiting structure. For other details not covered herein, please refer to the aforementioned embodiments 1-6.

[0067] See Figures 1-13 To facilitate the assembly and disassembly of the controller, the fertilizer applicator also includes a locking component 64. The locking component 64 comprises a sleeve rod and a locking bolt. One end of the sleeve rod has a locking hole, and the other end is connected to the inner wall of the sliding plate. A radially penetrating through hole is provided on the bottom wall of the locking hole of the sleeve rod. The end of the throttle cable controller's cable is engaged in the through hole, and the locking bolt is threaded into the locking hole. Thus, the controller cable is threaded through and engaged in the through hole, and then the locking bolt is tightened for assembly, facilitating assembly and disassembly.

[0068] Example 8

[0069] This embodiment 8 is an improvement on the aforementioned embodiments 1-7, and has an elastic limiting structure. For other details not covered herein, please refer to the aforementioned embodiments 1-7.

[0070] See Figures 1-13 To ensure the slide plate remains stable in both open and closed positions, the fertilizer applicator also includes a spring. In one example, a spring is installed between the bearing and the upper support of the linear shaft, with the spring sleeved on the linear shaft. The spring is in its natural or compressed state when the slide plate covers the feed inlet. In another example, a spring connects the upper positioning rod 22 and the slide plate 4. The spring is in its natural or compressed state when the slide plate covers the feed inlet. Thus, the restoring force of the spring is directed downwards (to the closed position of the slide plate), causing the slide plate to move towards the closed position. The slide plate is continuously subjected to force to close, or to make the slide plate more stable in the open position.

[0071] Example 9

[0072] The difference between this embodiment 9 and the aforementioned embodiments 1-8 is the structure of the feeding port. For other details not covered, please refer to the aforementioned embodiments 1-7.

[0073] See Figure 14 This fertilizer applicator has two feed inlets, corresponding to two sliding plates, two controllers, and two pairs of linear bearing assemblies. The feed inlets are spaced apart, and the base plate has a rake-like structure. The two sliding plates are also spaced apart. This allows for opening a specific feed inlet for fertilization depending on the usage situation; details will not be elaborated here. Alternatively, it can be configured with three feed inlets, etc.

[0074] As described in Examples 1-9 above, the upper ring rod and support frame, etc., can be made of stainless steel or steel square tube or U-shaped rod, the plate-shaped parts such as the slide plate can be made of stainless steel sheet, and the thin-skinned material box wall panel is made of stainless steel sheet welded together. These are all existing technologies and will not be described in detail here.

[0075] It should be noted that the examples of the above embodiments can preferably be combined with one or more of each other according to actual needs, and the accompanying drawings of multiple examples adopt a set of combined technical features, which will not be described in detail here.

[0076] It should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", 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 this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation.

[0077] The above description is a detailed explanation and illustration of the preferred embodiments of the present utility model. However, these descriptions are not intended to limit the scope of protection claimed by the present utility model. All equivalent changes or modifications made under the technical teachings of the present utility model shall fall within the patent protection scope covered by the present utility model.

Claims

1. A mixed fertilizer applicator, comprising a feed hopper mounted on a tractor or tractor frame, characterized in that, The upper opening of the material box forms a feed inlet, and the lower end of the material box is provided with at least one discharge port. The discharge port extends laterally in a strip shape, and the at least one discharge port is evenly arranged laterally, with the distance between two adjacent discharge ports being less than the lateral length of the discharge port. It also includes a slide plate and a controller. The slide plate and the controller are used in pairs with the discharge ports. The slide plate is slidably connected to the discharge port, and the controller is connected to the slide plate to pull the slide plate to move under the action of external force.

2. The mixed fertilizer applicator according to claim 1, characterized in that: It also includes a support frame. One end of the support frame is provided on the inner outer wall of the material box, and the other end of the support frame is provided with a support hole to be bolted to the front bumper or rear towing seat of the tractor. The lateral length of the discharge port is greater than or equal to 20cm, and the distance between two adjacent discharge ports is less than or equal to 5cm.

3. The mixed fertilizer applicator according to claim 1, characterized in that: It also includes linear bearing kits, with two linear bearing kits configured for each discharge port. The two linear bearing kits are arranged evenly in the transverse direction at the discharge port. The linear shaft of the linear bearing kit is fixedly connected to the material box, and the bearing of the linear bearing kit is fixedly connected to the slide plate. A spring is provided between the bearing and the upper support of the linear shaft. The spring is sleeved on the linear shaft. When the slide plate covers the discharge port, the spring is in a natural state or a compressed state.

4. The mixed fertilizer applicator according to claim 1, characterized in that: The bottom wall of the hopper slopes downward from the outside to the inside, and the discharge port is located at the bottom end of the inner outer wall of the hopper. The slide plate can slide up and down and is connected to the discharge port.

5. The mixed fertilizer applicator according to claim 4, characterized in that: It also includes a seat plate. The inner wall of the material box is made of thin skin. A seat plate is provided above the material outlet on the inner outer wall of the material box. The seat plate is located between the inner outer wall of the material box and the slide plate. The seat plate has a frame plate extending downward on both sides corresponding to each material outlet.

6. The mixed fertilizer applicator according to claim 4, characterized in that: It also includes an upper positioning rod, which extends laterally and is located on the inner outer wall of the material box. The upper positioning rod is positioned above the slide plate. When the slide plate slides upward, its upper end approaches the upper positioning rod. When the slide plate slides downward, its lower end approaches and can abut against the bottom wall of the material box. A spring is connected between the upper positioning rod and the slide plate. The spring is in a natural state or a compressed state when the slide plate covers the material outlet.

7. The mixed fertilizer applicator according to claim 1, characterized in that: The controller is a throttle cable controller, the wheel of which is located in the tractor's cab, and the cable end of which is bolted to the slide plate; the bottom wall and all four side walls of the hopper are made of stainless steel.

8. The mixed fertilizer applicator according to claim 7, characterized in that: It also includes a locking component, which includes a sleeve rod and a locking bolt. One end of the sleeve rod is provided with a locking hole, and the other end of the sleeve rod is connected to the inner side wall of the slide plate. A radial through hole is provided at the bottom wall of the locking hole of the sleeve rod. The end of the throttle cable controller is engaged with the through hole, and the locking hole is threaded with a locking bolt.

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