Smearing device for smearing mikania micrantha wilt virus

Abstract

The utility model relates to a smearing device for smearing mikania micrantha wilt virus. The smearing device comprises a storage unit and a smearing unit, the storage unit comprises a box body, a partition plate is arranged in the box body and divides the box body into a liquid storage chamber and a power chamber, a liquid inlet is formed in the top of the liquid storage chamber, a liquid outlet is formed in the side portion of the liquid storage chamber, and a water pump and a power source are arranged in the power chamber; the smearing unit comprises a guide pipe part and a smearing mechanism, the smearing mechanism comprises a hollow smearing body, at least two smearing discs and at least two drivers, the bottom of the smearing body is connected with the guide pipe part, the smearing discs are rotatably installed at the top of the smearing body, the drivers are rotatably connected with the smearing discs, and a first control switch is arranged on the guide pipe part; when the first control switch is turned on, the water pump is controlled to pump the smearing liquid to the smearing disc, and meanwhile, the driver drives the smearing disc to rotate so as to smear the smearing liquid on the leaves of the mikania micrantha. The smearing unit is used for uniformly smearing mikania micrantha wilt viruses on mikania micrantha plants, so that the control effect is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of biological control, and in particular to a smearing device for smearing micrantha wilt virus. Background Art

[0002] Mikania micrantha is a perennial herbaceous plant of the Asteraceae family and the genus Pseudo-Eupatorium. It is one of the first invasive harmful species in my country and is known as a "plant killer". The plant quickly climbs up trees and shrubs, and can achieve large-scale coverage in a short period of time, resulting in obstruction of plant light, and inhibits the normal growth of other plants by secreting allelopathic substances, causing serious harm to my country's ecological security. Mikania wilt virus belongs to the family of coproviridae, which can cause symptoms such as wrinkled leaves and top withering of Mikania micrantha, inhibiting the growth and reproduction of Mikania micrantha. Therefore, using Mikania wilt virus to infect Mikania micrantha is an effective method for preventing and controlling Mikania micrantha. In nature, the transmission of Mikania wilt virus between plants is mainly carried out by insects feeding on leaves with their mouthparts, but the transmission speed of this method is slow and there is a certain degree of randomness. Therefore, how to develop a smearing device that can quickly and effectively apply wilt virus to Mikania micrantha through artificial intervention is a problem that urgently needs to be solved. Utility Model Content

[0003] In view of the problems existing in the prior art, the purpose of the utility model is to provide a smearing device for smearing micrantha wilt virus, comprising a storage unit and a smearing unit. The micrantha wilt virus is evenly smeared on the micrantha plant through the smearing unit, which can greatly increase the infection rate of micrantha wilt virus on micrantha and improve the prevention and control effect. The use of biological control methods greatly reduces the harm to the environment and soil compared with chemical control.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A smearing device for smearing micrantha wilt virus comprises a storage unit and a smearing unit detachably connected to one side of the storage unit; the storage unit comprises a box body, a partition plate is provided in the box body, the partition plate divides the box body into a liquid storage chamber and a power chamber arranged up and down, the top of the liquid storage chamber is provided with a liquid inlet for receiving a smearing liquid, the side of the liquid storage chamber is provided with a liquid discharge port for discharging the smearing liquid, the power chamber comprises a water pump and a power supply, the water pump is used to extract the smearing liquid to the liquid discharge port; the smearing unit comprises a conduit member and a smearing mechanism, the conduit member is connected to the liquid discharge port, the smearing mechanism comprises a hollow smearing body, at least two smearing discs and at least two drivers, the bottom of the smearing body is connected to the conduit member, the smearing disc is rotatably mounted on the top of the smearing body, the driver is located at the lower part of the smearing body and is rotatably connected to the smearing disc, the driver is connected to a power circuit, the conduit member is provided with a first control switch, when the first control switch is turned on, the water pump is controlled to pump the smearing liquid to the smearing disc, and at the same time the driver drives the smearing disc to rotate so as to smear the smearing liquid on the leaves of micrantha wilt.

[0006] Furthermore, the smear plate is a hollow structure, with a plurality of smear holes on the top, and a liquid suction head for smearing the ragweed leaves is inserted into the smear holes. The bottom of the smear plate has a liquid inlet and a groove, and the top of the driver has a protrusion matching the groove.

[0007] Furthermore, a liquid delivery tube is provided in the conduit member, one end of the liquid delivery tube is connected to the liquid discharge port, and the other end of the liquid delivery tube is connected to the bottom of the smear body.

[0008] Furthermore, there are two smear plates and two drivers, and each driver is rotationally connected to the smear plate.

[0009] Furthermore, a three-way pipe is provided between the coating body and the conduit member, the two ends of the three-way pipe are respectively connected to the two ends of the bottom of the coating body and correspond to the two drivers respectively, and the third end of the three-way pipe is connected to the middle position of the bottom of the coating body.

[0010] Furthermore, a second control switch is provided on the outside of the power chamber, the second control switch and the water pump are respectively connected to the power circuit, the water pump is fixed to the partition plate, and the top of the water pump has an input port for extracting the coating liquid and an output port connected to the discharge port through a pipeline.

[0011] Furthermore, the second control switch includes a box body fixedly connected to the outside of the power chamber and a box cover movably connected to the box body, and the box body is provided with a charging interface and a switch button, and the charging interface and the switch button are respectively connected to the power circuit.

[0012] Furthermore, the top of the box body is provided with a handle.

[0013] Furthermore, the side of the box body also has a shoulder strap.

[0014] Furthermore, the catheter member includes an application tube and an extension tube. One end of the application tube is provided with a plurality of slots, and the extension tube is correspondingly provided with a plurality of through holes. The slots are fixedly connected to the through holes by limiting bolts.

[0015] The utility model has the following advantages:

[0016] 1. The smearing device of the utility model includes a storage unit and a smearing unit detachably connected to one side of the storage unit. The user can carry the storage unit with the help of a shoulder strap. The storage unit is provided with a concave surface, and its concave surface design greatly improves the comfort of use. During operation, the user only needs to hold the catheter part, put the smearing plate in close contact with the leaves of Mikania micrantha, and then turn on the first control switch on the catheter part. This action will allow the water pump to transport the smearing liquid to the smearing plate, and the driver will drive the smearing plate to rotate to achieve uniform smearing. This method not only improves the uniformity of smearing, but also significantly reduces the fatigue of the user.

[0017] 2. The smearing mechanism of the utility model, when the first control switch is turned on, the water pump starts quickly to deliver the smearing liquid to the smearing plate. Driven by the driver, the smearing plate rotates and the smearing liquid is evenly and directly covered on the leaves of Mikania micrantha, achieving a high infectivity effect. The direct contact between the smearing plate and the leaves can also cause slight damage to the leaves of Mikania micrantha, further increasing the infection rate of the virus. In addition, the rotating action of the smearing plate ensures the uniform distribution of the smearing liquid, greatly improves the smearing efficiency, and saves time and manpower. This device is particularly suitable for large-scale Mikania micrantha prevention and control work. Compared with traditional pesticides, it is more environmentally friendly and efficient, and can effectively prevent Mikania micrantha from growing again.

[0018] 3. The catheter member of the utility model includes an application tube and an extension tube. The user can adjust the length of the catheter member according to the height of the Mikania micrantha, ensuring that the application plate can accurately and efficiently contact the leaves of the Mikania micrantha. No matter where it is located, it can be evenly applied, thereby enhancing the flexibility and practicality of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The utility model is a three-dimensional structural schematic diagram of a smearing device for smearing Mikania wilt virus.

[0020] Figure 2 It is a three-dimensional structural schematic diagram of the storage unit of the utility model.

[0021] Figure 3 It is a three-dimensional cross-sectional view of the storage unit of the utility model.

[0022] Figure 4 It is a three-dimensional structural schematic diagram of the smearing mechanism of the utility model.

[0023] Figure 5 It is a cross-sectional view of the smearing mechanism of the utility model.

[0024] Among them, 1 is a storage unit, 101 is a box body, 102 is a partition plate, 103 is a liquid storage chamber, 103a is a liquid inlet, 103b is a liquid discharge port, 104 is a power chamber, 104a is a water pump, 104a1 is an input port, 104a2 is an output port, 104b is a power source, 104c is a second control switch, 104c1 is a box body, 104c2 is a box cover, 104c3 is a charging interface, and 104c4 is a switch button , 105 is a handle, 106 is a shoulder strap, 2 is a coating unit, 201 is a conduit member, 201a is a first control switch, 201b is a liquid delivery pipe, 201c is a three-way pipe, 202 is a coating mechanism, 202a is a coating body, 202b is a coating plate, 202b1 is a coating hole, 202b2 is a liquid suction head, 202b3 is a liquid inlet, 202b4 is a groove, 202c is a driver, and 202c1 is a protrusion. DETAILED DESCRIPTION

[0025] The following description is essentially only exemplary and is not intended to limit the present invention, its application or use. It will be further understood that the term "include" and / or "comprising" specifies the existence of the features, wholes, steps, operations, elements and / or parts described when used in this specification, but does not exclude the existence of one or more other features, wholes, steps, operations, elements, parts and / or its groups or add one or more other features, wholes, steps, operations, elements, parts and / or its groups. As used in this article, the term "and / or" includes any and all combinations of one or more of the associated listed items. It will be understood that when an element, component and / or part is referred to as "connected to another element, component and / or part", it can be directly connected to another element, component and / or part, or there can be an intermediate element. It will be understood that although the terms "first", "second" and the like can be used to describe various elements, components and / or parts in this article, these elements, components and / or parts should not be limited by these terms. These terms are only used to distinguish an element, component or part from another element, component or part. Therefore, the first element, component or part discussed below can be referred to as the second element, component or part without departing from the teaching of the utility model. Unless otherwise defined, all terms (including technical terms and scientific terms) used in this article have the same meanings as those commonly understood by those of ordinary skill in the field to which the utility model belongs. It will be further understood that terms such as those defined in commonly used dictionaries should be interpreted as having meanings consistent with their meanings in the relevant field and / or the context of this specification, and will not be interpreted in an idealized or overly formal sense, unless explicitly defined as such herein.

[0026] It should be understood that, in order to clearly show the contents therein, the drawings herein are not drawn to scale, and the same or similar reference numerals indicate the same or similar components or parts. In addition, it should be understood that any embodiments described in this application and the technical features included therein can be combined with each other.

[0027] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0028] like Figure 1-5 As shown, a smearing device for smearing micrantha wilt virus comprises a storage unit and a smearing unit detachably connected to one side of the storage unit; the storage unit comprises a box body, a partition plate is provided in the box body, the partition plate divides the box body into a liquid storage chamber and a power chamber arranged up and down, the top of the liquid storage chamber has a liquid inlet for receiving the smearing liquid, the side of the liquid storage chamber has a liquid discharge port for discharging the smearing liquid, the power chamber comprises a water pump and a power supply, the water pump is used to extract the smearing liquid to the liquid discharge port; the smearing unit comprises a conduit member and a smearing mechanism, the conduit member is connected to the liquid discharge port, the smearing mechanism comprises a hollow smearing body, at least two smearing discs and at least two drivers, the bottom of the smearing body is connected to the conduit member, the smearing disc is rotatably mounted on the top of the smearing body, the driver is located at the lower part of the smearing body and is rotatably connected to the smearing disc, the driver is connected to the power circuit, the conduit member has a first control switch, when the first control switch is turned on, the water pump is controlled to pump the smearing liquid to the smearing disc, and at the same time the driver drives the smearing disc to rotate so as to smear the smearing liquid on the leaves of micrantha. The box body is made of double-layer insulation material, and the liquid storage chamber and the power chamber are divided into two relatively closed spaces by a partition plate. The liquid storage chamber is used to store the coating liquid, which is generally wilt virus, but can also include other agents for use in combination. The power chamber is used to load the power supply and water pump, and the power supply is a battery, which provides a power source for the water pump and the driver. There are two liquid inlets, and each liquid inlet is provided with a cover body to facilitate the delivery of different coating liquids therein. In addition, the sizes of the two liquid inlets can be designed to be different sizes. Such a design not only helps to distinguish the two liquid inlets, but also allows users to quickly identify the type of coating liquid corresponding to the liquid inlets of different sizes, thereby improving the convenience and efficiency of operation. The connection method between the conduit member and the coating body and the discharge port can be a threaded connection, a snap connection or other quick-disassembly connection method. The driver can be a motor, a pneumatic motor or any other power source that can drive the coating disc to rotate.

[0029] like Figure 5As shown, the smear plate is a hollow structure, and the top of the smear plate has a plurality of smear holes, and the smear holes are plugged with a liquid suction head for smearing the leaves of Mikania micrantha. The bottom of the smear plate has a liquid inlet and a groove, and the top of the driver has a protrusion that matches the groove. The smear plate can have smear holes of different shapes and sizes to accommodate Mikania micrantha leaves of different sizes, that is, the smear plate can be replaced as needed. Specifically, the smear plate is a hollow disc structure, and the smear holes are evenly arranged on the top of the smear plate, and the size of each smear hole is equal. However, the size of the smear holes can also be unequal, for example, the size of the smear holes near the center of the smear plate is larger than that of the edge. Such a design ensures that when the smear plate rotates, the smear liquid at the center can be applied to the leaves more, while the smear liquid at the edge plays an auxiliary application role, while avoiding the waste of smear liquid due to excessive liquid discharge at the edge during the rotation process, thereby achieving efficient use of the smear liquid. The liquid suction head is inserted into the smear hole to absorb the smear liquid in the smear plate and smear it on the blades. The material of the liquid suction head can be polypropylene (PP), polytetrafluoroethylene (PTFE) or nylon.

[0030] like Figure 1 , 4 As shown in Figure 5, there is a liquid delivery pipe in the conduit part, one end of the liquid delivery pipe is connected to the discharge port, and the other end of the liquid delivery pipe is connected to the bottom of the coating body. Among them, the space between the conduit part and the liquid delivery pipe can accommodate the wiring harness, which is not only connected to the driver to ensure that the coating plate can rotate according to the preset speed and mode, but also connected to the first control switch, so that the user can control the coating liquid to be delivered to the coating plate. At the same time, the wiring harness is also connected to the water pump and the power supply to provide stable power support for the entire coating device. The first control switch is mainly used to control the water pump to pump the coating liquid into the coating plate through the conduit part, and is connected to the driver circuit to control the start and stop of the driver through the first control switch.

[0031] like Figure 1 , 4 As shown in Figure 5, there are two smear plates and two drivers, and each driver is rotatably connected to the smear plate. Two openings are arranged side by side on the top of the smear body, the smear plate is mounted on the opening, and the driver is located below the smear plate and rotatably connected. The rotation directions of the two smear plates may be the same or different. In the present embodiment, the two smear plates have the same rotation direction and the same rotation speed, so that the smearing process is more uniform and stable. In order to prevent the smearing liquid from leaking during operation, a sealing gasket is installed between the smearing plate and the opening. The sealing gasket has good elasticity and corrosion resistance, can fit the smearing plate and the opening tightly, and effectively prevent the smearing liquid from leaking out of the gap.

[0032] like Figure 5As shown, there is also a three-way pipe between the coating body and the conduit member, and the two ends of the three-way pipe are respectively connected to the two ends of the bottom of the coating body and correspond to the two drivers respectively, and the third end of the three-way pipe is connected to the middle position of the bottom of the coating body. This layout ensures the efficiency and stability of the coating liquid during the transportation process. After the coating liquid enters the three-way pipe from the conduit member, the coating liquid flows into the coating body through the two ends of the three-way pipe, passes through the driver without direct contact with it, and directly enters the interior of the coating plate. At the same time, the coating liquid entering the coating body from the third end of the three-way pipe flows directly into the interior of the coating plate. The coating liquid is transported through three channels to ensure that the coating liquid can be evenly and stably distributed to the coating body and the coating plate. This distribution method not only improves the coating efficiency and uniformity, but also ensures the consistency and reliability of the coating operation.

[0033] like Figure 1-3 As shown, there is a second control switch on the outside of the power chamber, and the second control switch and the water pump are respectively connected to the power circuit. The water pump is fixed to the partition plate, and the top of the water pump has an input port for extracting the coating liquid and an output port connected to the discharge port through a pipeline. The input port is used to extract the coating liquid in the liquid storage chamber into the water pump, and the output port is used to discharge and transport the coating liquid to the discharge port. The second control switch mainly controls the extraction action of the water pump. When the user needs to start the coating operation, he only needs to operate the second control switch to start the water pump to extract the coating liquid from the liquid storage chamber. At the same time, the first control switch on the conduit member is used to achieve precise control of the coating liquid delivery. The first control switch can control the speed and amount of discharge from the output port of the water pump, thereby controlling the amount of coating liquid discharged from the coating plate.

[0034] like Figure 2 As shown, the second control switch includes a box body fixedly connected to the outside of the power chamber and a box cover movably connected to the box body. The box body is provided with a charging interface and a switch button, and the charging interface and the switch button are respectively connected to the power circuit. The box cover and the box body are designed to be waterproof and dustproof to ensure that the internal circuit can be kept dry and clean even in harsh working environments. The opening and closing method of the box cover is designed to be easy to operate and safe and reliable, which can effectively prevent accidental touch or accidental opening. The charging interface and the switch button are integrated inside the box body. The charging interface is used to charge the power supply to ensure that energy can be quickly replenished when the power supply is insufficient. The switch button controls the water pump to extract the coating liquid. The user presses the switch button to start or stop the pumping action of the water pump.

[0035] like Figure 1-3 As shown, the top of the box body is also provided with a handle to facilitate the user to carry or move the application device.

[0036] like Figure 1 and Figure 2As shown, the side of the box body is also provided with a shoulder strap. The user can carry the box body with the help of the shoulder strap. The box body is provided with a concave surface, which matches the back of the user. The concave surface design greatly improves the comfort of use.

[0037] In an embodiment not shown, the side of the box body also has a buckle for clamping the conduit member, and the size and shape of the buckle are adapted to the conduit member, so that the user can conveniently take and put it in. When the conduit member is not in use, the conduit member can be better stored so that it will not slide off when the box body is moved and tilted, and it is convenient to carry and store.

[0038] In an embodiment not shown, the catheter member includes an application tube and an extension tube, one end of the application tube is provided with a plurality of slots, and the extension tube is correspondingly provided with a plurality of through holes, and the slots are fixedly connected to the through holes by limit bolts. By adjusting the fixed connection between the limit bolts and different slots and through holes, the length of the application tube and the extension tube can be easily adjusted, thereby realizing the telescopic function of the catheter member. This arrangement not only allows the user to flexibly adjust the height of the application mechanism, effectively avoiding the inconvenience of the user having to climb high for application, but also improves work efficiency and safety. In addition, the use of a telescopic catheter member can prevent and control ragweed growing on the ground and walls, and has strong applicability.

[0039] The working method of the utility model is as follows:

[0040] The user carries the storage unit on his back through the strap, the concave surface matches the user's back, starts the second control switch, the power source drives the water pump to extract the coating liquid, then holds the coating unit, starts the first control switch, the water pump pumps the coating liquid to the coating plate, and the driver drives the coating plate to rotate, so as to apply the coating liquid on the leaves of Mikania micrantha. Specifically, by adjusting the length of the coating tube and the extension tube to adjust the height of the coating mechanism, the coating plate can be applied to plants in different directions.

[0041] In general, the smearing device of the utility model includes a storage unit and a smearing unit detachably connected to one side of the storage unit. The user can carry the storage unit with the help of a shoulder strap. The storage unit is provided with a concave surface, and its concave surface design greatly improves the comfort of use. During operation, the user only needs to hold the catheter part, put the smearing plate in close contact with the leaves of Mikania micrantha, and then turn on the first control switch on the catheter part. This action will allow the water pump to deliver the smearing liquid to the smearing plate, and the driver will drive the smearing plate to rotate to achieve uniform smearing. This method not only improves the uniformity of smearing, but also significantly reduces the fatigue of the user. In the smearing mechanism of the utility model, when the first control switch is turned on, the water pump starts quickly to deliver the smearing liquid to the smearing plate. Under the drive of the driver, the smearing plate rotates and the smearing liquid is evenly and directly covered on the leaves of Mikania micrantha, achieving the effect of high infectivity. The direct contact between the smearing plate and the leaves can also cause slight damage to the leaves of Mikania micrantha, further increasing the infection rate of the virus. In addition, the rotating action of the smearing plate ensures the uniform distribution of the smearing liquid, greatly improves the smearing efficiency, and saves time and manpower. This device is particularly suitable for large-scale prevention and control of Mikania micrantha. Compared with traditional pesticides, it is more environmentally friendly and efficient, and can effectively prevent Mikania micrantha from growing again. The catheter member of the utility model includes an application tube and an extension tube. The user can adjust the length of the catheter member according to the height of Mikania micrantha, ensuring that the application plate can accurately and efficiently contact the leaves of Mikania micrantha, and can be evenly applied no matter where it is located, thereby enhancing the flexibility and practicality of the device.

[0042] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited by the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principle of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A smearing device for smearing Mikania wilt virus, characterized in that: It includes a storage unit and a smearing unit detachably connected to one side of the storage unit; The storage unit includes a box body, a partition plate is provided in the box body, and the partition plate divides the box body into a liquid storage chamber and a power chamber arranged up and down, the top of the liquid storage chamber is provided with a liquid inlet for receiving the coating liquid, and the side of the liquid storage chamber is provided with a liquid discharge port for discharging the coating liquid, and the power chamber includes a water pump and a power supply, and the water pump is used to draw the coating liquid to the liquid discharge port; The smearing unit includes a conduit member and a smearing mechanism, the conduit member is connected to the discharge port, the smearing mechanism includes a hollow smearing body, at least two smearing plates and at least two drivers, the bottom of the smearing body is connected to the conduit member, the smearing plate is rotatably mounted on the top of the smearing body, the driver is located at the lower part of the smearing body and is rotatably connected to the smearing plate, the driver is connected to the power supply circuit, and a first control switch is provided on the conduit member. When the first control switch is turned on, the water pump is controlled to pump the smearing liquid to the smearing plate, and at the same time the driver drives the smearing plate to rotate so as to smear the smearing liquid on the leaves of the ragweed.

2. The smearing device for smearing Mikania wilt virus according to claim 1, characterized in that: The smear plate is a hollow structure with a plurality of smear holes on the top, and liquid suction heads for smearing the Mikania leaves are inserted into the smear holes. The bottom of the smear plate has a liquid inlet and a groove, and the top of the driver has a protrusion matching the groove.

3. The smearing device for smearing Mikania wilt virus according to claim 1, characterized in that: A liquid delivery pipe is arranged in the conduit part, one end of the liquid delivery pipe is connected with the liquid discharge port, and the other end of the liquid delivery pipe is connected with the bottom of the smear body.

4. The smearing device for smearing Mikania wilt virus according to claim 1, characterized in that: The number of the smearing discs is two, the number of the drivers is two, and each driver is rotationally connected to the smearing disc.

5. The smearing device for smearing Mikania wilt virus according to claim 4, characterized in that: There is also a three-way pipe between the coating body and the conduit member, the two ends of the three-way pipe are respectively connected to the two ends of the bottom of the coating body and correspond to the two drivers respectively, and the third end of the three-way pipe is connected to the middle position of the bottom of the coating body.

6. The smearing device for smearing Mikania wilt virus according to claim 1, characterized in that: A second control switch is provided on the outside of the power chamber. The second control switch and the water pump are respectively connected to the power circuit. The water pump is fixed to the partition plate. The top of the water pump has an input port for extracting the coating liquid and an output port connected to the discharge port through a pipeline.

7. The smearing device for smearing Mikania wilt virus according to claim 6, characterized in that: The second control switch comprises a box body fixedly connected to the outside of the power chamber and a box cover movably connected to the box body. The box body is provided with a charging interface and a switch button, and the charging interface and the switch button are respectively connected to the power circuit.

8. The smearing device for smearing Mikania wilt virus according to claim 1, characterized in that: The top of the box also has a handle.

9. The smearing device for smearing Mikania wilt virus according to claim 1, characterized in that: The sides of the case also have shoulder straps.

10. The smearing device for smearing Mikania wilt virus according to claim 1, characterized in that: The catheter part includes an application tube and an extension tube. One end of the application tube is provided with a plurality of slot holes, and the extension tube is correspondingly provided with a plurality of through holes. The slot holes are fixedly connected with the through holes by limiting bolts.

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