A filter washing and filtering two-in-one filter

Abstract

The utility model discloses a filter of filter and washing two in one, including jar body, the inside lower extreme fixed of jar body is equipped with a circle and is circularly shaped and places the board, and the placement board is circular, and five layer sintered net filter plate is fixed in the top of placement board, and five layer sintered net filter plate is the first filter plate, second filter plate, third filter plate, fourth filter plate, fifth filter plate splicing and is the board of cross section circular, and the bottom of placement board is equipped with a circle and is annular first support plate, and the bottom of first support plate is inclined, and the inner diameter of first support plate is consistent with the inner diameter of placement board, the square of first support plate and the liquid outlet corresponding place is equipped with the slot of giving room. The utility model has the advantages of convenient replacement five layer sintered net filter plate, five layer sintered net filter plate fixed stable.

Description

Technical Field

[0001] This utility model relates to the field of solid-liquid separation and filtration equipment, and in particular to a filter that combines filtration and washing. Background Technology

[0002] In the petrochemical, fine chemical, pharmaceutical, and food industries, there is a need for a combined filtration and washing filter to separate solids and liquids from materials.

[0003] Currently, a patent with authorization announcement number "CN219024017U" discloses a solid-liquid separation two-in-one filter, which includes a filter tank. The filter tank is equipped with a filtration device and a washing device. The filtration device includes a liquid inlet, a positive pressure port, a liquid outlet, and a five-layer sintered mesh filter plate. The liquid inlet is installed at one end of the top of the filter tank, the positive pressure port is also installed at the top of the filter tank, and the liquid outlet is installed at the bottom of the filter tank and is in a horizontal position. The five-layer sintered mesh filter plate is fixedly connected to the inside of the filter tank, and the horizontal plane of the liquid outlet is located at the bottom of the five-layer sintered mesh filter plate. The washing device includes a spray washing port, a spray ball, and a stirring assembly. The spray washing port is installed at the top of the filter tank, the spray ball is installed below the spray washing port, and the stirring assembly is located inside the filter tank. The five-layer sintered mesh filter plate requires cleaning and maintenance, necessitating its disassembly. It is specified that the five-layer sintered mesh filter plate is fixedly connected inside the filter tank. However, the filter tank is a single unit and cannot be divided into upper and lower parts. Furthermore, maintenance can only be performed through the inspection port, but the diameter of the inspection port cannot match the diameter of the tank. Moreover, for commonly used 316L stainless steel five-layer sintered mesh, the Vickers microhardness of its dense surface layer is typically in the range of HV250 to HV400, making it impossible to bend. Therefore, the five-layer sintered mesh filter plate cannot be placed inside the tank. Utility Model Content

[0004] The purpose of this utility model is to provide a filter that combines filtration and washing, which has the advantages of convenient replacement of the five-layer sintered mesh filter plate and stable fixation of the five-layer sintered mesh filter plate.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution:

[0006] A filter that combines filtration and washing, comprising a tank, a hydraulic lifting device, a motor, a stirring shaft, and a five-layer sintered mesh filter plate;

[0007] The hydraulic lifting device is fixedly located at the top of the tank, the motor is fixedly located at the top of the hydraulic lifting device, the stirring shaft passes vertically through the top of the tank, the upper end of the stirring shaft passes through the hydraulic lifting device and is connected to the motor for transmission, and the five-layer sintered mesh filter plate is fixedly located at the lower end of the inside of the tank.

[0008] The lower interior of the tank is fixed with a ring-shaped placement plate, and the five-layer sintered mesh filter plate is fixed on top of the placement plate.

[0009] The five-layer sintered mesh filter plate is a plate with a circular cross-section, formed by splicing together the first filter plate, the second filter plate, the third filter plate, the fourth filter plate, and the fifth filter plate.

[0010] The bottom right side of the first filter plate, the second filter plate, the third filter plate, and the fourth filter plate are all provided with a first opening in the shape of an "L" in vertical cross section. The top left side of the second filter plate, the third filter plate, the fourth filter plate, and the fifth filter plate are all provided with a second opening in the shape of an "L" in vertical cross section with the "L" opening facing downwards. The adjacent first openings and second openings interlock with each other.

[0011] The lower interior of the tank is fixedly provided with a liquid outlet guide plate, which is located below the five-layer sintered mesh filter plate. The liquid outlet guide plate is inclined. A ring-shaped first support plate is fixedly provided at the bottom of the placement plate. The bottom of the first support plate is inclined and the bottom of the first support plate is fixedly connected to the top of the liquid outlet guide plate.

[0012] A liquid outlet is provided on the side of the tank, corresponding to the lowest point of the liquid outlet guide plate;

[0013] The first support plate has a square clearance groove corresponding to the liquid outlet. The front side of the first support plate has a bent edge towards the liquid outlet, and each bent edge is fixedly connected to the tank body, the placement plate, and the liquid outlet guide plate.

[0014] The preferred option is as follows:

[0015] Preferably, the bottom of the liquid outlet guide plate is fixedly provided with a plurality of concentric circular second support plates, the tops of the plurality of second support plates are all inclined, the bottoms of the plurality of second support plates are flush with the bottom of the tank body, the bottom of the tank body is fixedly provided with a sealing plate, the sealing plate is fixedly connected to the plurality of second support plates, and the bottom of the sealing plate is fixedly provided with a support leg.

[0016] Preferably, the hydraulic lifting device includes a hydraulic cylinder, three guide rods, a guide frame, three first linear bearings, and a second linear bearing;

[0017] The hydraulic cylinder and three guide rods are all flange-connected and fixed at the top of the tank. The top of the telescopic rod of the hydraulic cylinder is fixedly connected to the bottom of the guide frame. The three first linear bearings are fixedly located inside the guide frame. The three guide rods are slidably inserted into the three first linear bearings. The second linear bearing is placed vertically in the middle of the guide frame. The stirring shaft is inserted into the second linear bearing.

[0018] Preferably, the inner diameter of the first support plate is the same as the inner diameter of the placement plate.

[0019] Preferably, the angle between each of the bent edges and the side corresponding to the outer diameter of the first support plate is 135°.

[0020] Preferably, a maintenance manhole is provided on one side of the tank body, and the maintenance manhole is located above the five-layer sintered mesh filter plate.

[0021] Preferably, the bottom of the stirring shaft is fixedly provided with stirring blades.

[0022] Preferably, a mechanical seal is fixedly provided on the top of the tank, and the stirring shaft is slidably inserted into the mechanical seal.

[0023] Preferably, the top of the placement plate has an annular placement groove, the inner diameter of which is the same as the inner diameter of the placement plate, and the outer diameter of which is 1.1 times the outer diameter of the five-layer sintered mesh filter plate. The bottom wall of the placement groove has a plurality of first threaded perforations arranged in a circular array. A sealing gasket is placed on the bottom wall of the placement groove. The tops of the first filter plate, the second filter plate, the third filter plate, the fourth filter plate, and the fifth filter plate all have a plurality of first circular perforations corresponding to the first threaded perforations. The top of each first circular perforation has a first chamfer. A first countersunk bolt is fixed in each first circular perforation, and each first countersunk bolt is threadedly connected to its corresponding first threaded perforation.

[0024] Preferably, the top right side of the first filter plate, the second filter plate, the third filter plate, and the fourth filter plate are provided with a plurality of second circular perforations arranged in an array from front to back, corresponding to the first opening;

[0025] The bottom left side of the second filter plate, the third filter plate, the fourth filter plate, and the fifth filter plate are all provided with several second threaded perforations that correspond to several second circular perforations, arranged in an array from front to back.

[0026] Each of the second circular perforations has a second chamfer at the top;

[0027] Each of the second circular perforations is fixed with a second countersunk bolt, and each second countersunk bolt is threadedly connected to its corresponding second threaded perforation.

[0028] In summary, this utility model has the following beneficial effects:

[0029] 1. The five-layer sintered mesh filter plate, consisting of a first filter plate, a second filter plate, a third filter plate, a fourth filter plate, and a fifth filter plate, is arranged in a circular cross-section. This design allows for easy installation and disassembly of the five-layer sintered mesh filter plate by sequentially inserting the first filter plate, the second filter plate, the third filter plate, the fourth filter plate, and the fifth filter plate into the tank through the maintenance manhole and assembling them inside the tank.

[0030] 2. The first support plate can support the placement plate and guide the liquid. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the overall structure of the embodiment;

[0032] Figure 2 This is a schematic diagram of the overall structure of the five-layer sintered mesh filter plate and the first support plate in the embodiment.

[0033] Figure 3 This is a bottom side view of the five-layer sintered mesh filter plate and the first support plate in the embodiment;

[0034] Figure 4 This is a partial cross-sectional view of the five-layer sintered mesh filter plate and the first support plate in the embodiment.

[0035] In the diagram, 1. Tank body; 2. Hydraulic lifting device; 3. Motor; 4. Agitator shaft; 5. Five-layer sintered mesh filter plate; 6. Liquid outlet guide plate; 111. Placement plate; 112. First support plate; 113. Liquid outlet; 114. Bending edge; 115. Sealing plate; 116. Support leg; 117. Inspection manhole; 118. Mechanical seal; 119. First countersunk bolt; 120. Second countersunk bolt; 211. Hydraulic cylinder; 212. Guide rod; 213. Guide frame; 214. First linear bearing; 215. Second linear bearing; 411. Agitator blade; 511. First filter plate; 512. Second filter plate; 513. Third filter plate; 514. Fourth filter plate; 515. Fifth filter plate; 611. Second support plate. Detailed Implementation

[0036] The present invention will be further described in detail below with reference to the accompanying drawings.

[0037] Identical components are indicated by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the following description refer to directions in the accompanying drawings.

[0038] A filter that combines filtration and washing, such as Figures 1-4As shown, it includes a tank body 1, a hydraulic lifting device 2, a motor 3, a stirring shaft 4, and a five-layer sintered mesh filter plate 5;

[0039] The top of the tank 1 is provided with a liquid inlet, a spray washing port and a positive pressure port. The upper part of the inside of the tank 1 is provided with a spray ball, and the lower part of the tank 1 is also provided with a discharge port. The specific structure of the tank 1 is described in a solid-liquid separation two-in-one filter disclosed in the patent with authorization announcement number "CN219024017U", and will not be elaborated here.

[0040] The hydraulic lifting device 2 is fixedly located at the top of the tank body 1, the motor 3 is fixedly located at the top of the hydraulic lifting device 2, the stirring shaft 4 passes vertically through the top of the tank body 1, the upper end of the stirring shaft 4 passes through the hydraulic lifting device 2 and is connected to the motor 3 for transmission, the five-layer sintered mesh filter plate 5 is fixedly located at the lower end of the inside of the tank body 1, and the bottom of the stirring shaft 4 is fixedly provided with stirring blades 411.

[0041] A ring-shaped placement plate 111 is fixedly installed at the lower end of the interior of the tank body 1. The placement plate 111 is ring-shaped, and the five-layer sintered mesh filter plate 5 is fixedly located on the top of the placement plate 111.

[0042] The five-layer sintered mesh filter plate 5 is a plate with a circular cross-section, which is spliced ​​together from the first filter plate 511, the second filter plate 512, the third filter plate 513, the fourth filter plate 514, and the fifth filter plate 515.

[0043] The bottom right side of the first filter plate 511, the second filter plate 512, the third filter plate 513, and the fourth filter plate 514 are all provided with a first opening in the shape of an "L" in vertical cross section. The top left side of the second filter plate 512, the third filter plate 513, the fourth filter plate 514, and the fifth filter plate 515 are all provided with a second opening in the shape of an "L" in vertical cross section with the "L" opening facing downwards. Adjacent first openings and second openings interlock with each other. The top right side of the first filter plate 511, the second filter plate 512, the third filter plate 513, and the fourth filter plate 514, corresponding to the first opening, are provided with a number of second circular perforations arranged in an array from front to back.

[0044] The bottom left side of the second filter plate 512, the third filter plate 513, the fourth filter plate 514, and the fifth filter plate 515 are each provided with a number of second threaded perforations corresponding to a number of second circular perforations, arranged from front to back.

[0045] Each second circular perforation has a second chamfer at the top;

[0046] Each second circular perforation is fixed with a second countersunk bolt 120, and each second countersunk bolt 120 is threadedly connected to its corresponding second threaded perforation, which can complete the installation and fixation of the five-layer sintered mesh filter plate 5 in the tank 1.

[0047] A liquid outlet guide plate 6 is fixedly installed at the lower end of the interior of the tank body 1. The liquid outlet guide plate 6 is located below the five-layer sintered mesh filter plate 5. The liquid outlet guide plate 6 is inclined. A ring-shaped first support plate 112 is fixedly installed at the bottom of the placement plate 111. The bottom of the first support plate 112 is inclined. The bottom of the first support plate 112 is fixedly connected to the top of the liquid outlet guide plate 6. The inner diameter of the first support plate 112 is the same as the inner diameter of the placement plate 111.

[0048] A liquid outlet 113 is provided on the side of the tank body 1, corresponding to the lowest position of the liquid outlet guide plate 6;

[0049] A square clearance groove is provided at the position of the first support plate 112 corresponding to the liquid outlet 113. The front side of the first support plate 112 is provided with a bent edge 114 towards the liquid outlet 113. The angle between each bent edge 114 and the side corresponding to the outer diameter of the first support plate 112 is 135°. Each bent edge 114 is fixedly connected to the tank body 1, the placement plate 111, and the liquid outlet guide plate 6, thus completing the liquid guiding function.

[0050] The bottom of the liquid discharge guide plate 6 is fixedly provided with a plurality of concentric circular second support plates 611. The tops of the plurality of second support plates 611 are all inclined. The bottoms of the plurality of second support plates 611 are flush with the bottom of the tank body 1. The bottom of the tank body 1 is fixedly provided with a sealing plate 115. The sealing plate 115 is fixedly connected to the plurality of second support plates 611. The bottom of the sealing plate 115 is fixedly provided with a support leg 116.

[0051] The hydraulic lifting device 2 includes a hydraulic cylinder 211, three guide rods 212, a guide frame 213, three first linear bearings 214, and a second linear bearing 215;

[0052] The hydraulic cylinder 211 and three guide rods 212 are all flange-connected and fixed at the top of the tank body 1. The top of the telescopic rod of the hydraulic cylinder 211 is fixedly connected to the bottom of the guide frame 213. The three first linear bearings 214 are fixedly located inside the guide frame 213. The three guide rods 212 are slidably inserted into the three first linear bearings 214. The second linear bearing 215 is placed vertically in the middle position inside the guide frame 213. The stirring shaft 4 is inserted into the second linear bearing 215.

[0053] A maintenance manhole 117 is provided on one side of the tank body 1. The maintenance manhole 117 is located above the five-layer sintered mesh filter plate 5. Maintenance personnel can enter the tank body 1 through the maintenance manhole 117 to install the filter plate and the stirring blade 411.

[0054] A mechanical seal 118 is fixedly installed on the top of the tank body 1, and the stirring shaft 4 is slidably inserted into the mechanical seal 118.

[0055] The top of the placement plate 111 is provided with an annular placement groove. The inner diameter of the placement groove is the same as the inner diameter of the placement plate 111. The outer diameter of the placement groove is 1.1 times the outer diameter of the five-layer sintered mesh filter plate 5. The bottom wall of the placement groove is provided with a number of first threaded through holes in a circular array. A sealing gasket is placed on the bottom wall of the placement groove. The tops of the first filter plate 511, the second filter plate 512, the third filter plate 513, the fourth filter plate 514, and the fifth filter plate 515 are all provided with a number of first circular through holes corresponding to the first threaded through holes. The top of each first circular through hole is provided with a first chamfer. A first countersunk bolt 119 is fixed in each first circular through hole. Each first countersunk bolt 119 is threadedly connected to its corresponding first threaded through hole.

[0056] Specific implementation process:

[0057] Installation of the five-layer sintered mesh filter plate 5:

[0058] Step 1: When installing the five-layer sintered mesh filter plate 5, first place the sealing gasket on the bottom wall of the placement groove through the inspection manhole 117;

[0059] Step 2: The operator first places the fifth filter plate 515 into the tank 1 through the maintenance manhole 117, places the fifth filter plate 515 on the right side of the placement slot, and connects the first countersunk bolt 119 on the fifth filter plate 515 to its corresponding first threaded through hole. The first countersunk bolt 119 is not tightened, and the fifth filter plate 515 can slide up and down along the first countersunk bolt 119 at this time.

[0060] Step 3: Place the fourth filter plate 514 into the tank 1 through the maintenance manhole 117, and engage the first opening on the right side of the fourth filter plate 514 with the second opening on the left side of the fifth filter plate 515.

[0061] Place the third filter plate 513 into the tank 1 through the maintenance manhole 117, and engage the first opening on the right side of the third filter plate 513 with the second opening on the left side of the fourth filter plate 514.

[0062] Place the second filter plate 512 into the tank 1 through the maintenance manhole 117, and engage the first opening on the right side of the second filter plate 512 with the second opening on the left side of the third filter plate 513.

[0063] Place the first filter plate 511 into the tank 1 through the maintenance manhole 117, and engage the first opening on the right side of the first filter plate 511 with the second opening on the left side of the second filter plate 512.

[0064] Step 4: Insert a first countersunk bolt 119 into each first circular through hole. Each first countersunk bolt 119 is threadedly connected to its corresponding first threaded through hole. At this time, each first countersunk bolt 119 is not tightened.

[0065] A second countersunk bolt 120 is inserted into each second circular through hole, and each second countersunk bolt 120 is threadedly connected to its corresponding second threaded through hole. At this time, each second countersunk bolt 120 is not tightened.

[0066] Step 5: Tighten each of the first countersunk bolt 119 and the second countersunk bolt 120;

[0067] Work process:

[0068] Filtration process: The operation is carried out under pressure or vacuum. The raw material liquid is injected into the tank 1 through the inlet and then pressurized by introducing nitrogen or compressed air through the positive pressure port, so that the clear liquid flows out from the outlet 113. The solid filter cake accumulates on the top of the five-layer sintered mesh filter plate 5. During filtration, the filter cake is flat and the solid-liquid separation effect is good.

[0069] Washing process: The 360° rotating spray ball below the spray washing port inside the tank 1 is used to introduce washing liquid. Under the action of the spray ball, the washing liquid is evenly distributed inside the tank 1, which can realize the internal cleaning of the tank 1 and the slurry washing of the filter cake. The hydraulic lifting device 2 causes the stirring blades to rise and fall repeatedly inside the tank to continuously stir, mix the filter cake and washing liquid, and make the filter cake thoroughly washed.

[0070] Unloading process: The material is loosened and automatically unloaded from the unloading port on the side of the tank 1 by rotating the stirring blade 411 counterclockwise.

[0071] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.

Claims

1. A filter that combines filtration and washing, characterized in that: Includes tank body (1), hydraulic lifting device (2), motor (3), stirring shaft (4), and five-layer sintered mesh filter plate (5); The hydraulic lifting device (2) is fixedly located at the top of the tank (1), the motor (3) is fixedly located at the top of the hydraulic lifting device (2), the stirring shaft (4) passes vertically through the top of the tank (1), the upper end of the stirring shaft (4) passes through the hydraulic lifting device (2) and is connected to the motor (3) for transmission, and the five-layer sintered mesh filter plate (5) is fixedly located at the lower end of the inside of the tank (1); The lower end of the tank (1) is fixedly provided with a ring-shaped placement plate (111). The placement plate (111) is ring-shaped, and the five-layer sintered mesh filter plate (5) is fixedly located on the top of the placement plate (111). The five-layer sintered mesh filter plate (5) is a plate with a circular cross-section, formed by splicing together the first filter plate (511), the second filter plate (512), the third filter plate (513), the fourth filter plate (514), and the fifth filter plate (515). The bottom right side of the first filter plate (511), the second filter plate (512), the third filter plate (513), and the fourth filter plate (514) are all provided with a first opening with a vertical cross section in the shape of an "L". The top left side of the second filter plate (512), the third filter plate (513), the fourth filter plate (514), and the fifth filter plate (515) are all provided with a second opening with a vertical cross section in the shape of an "L" and the "L" opening facing downwards. The adjacent first openings and second openings interlock with each other. The lower end of the tank (1) is fixedly provided with a liquid outlet guide plate (6). The liquid outlet guide plate (6) is located below the five-layer sintered mesh filter plate (5). The liquid outlet guide plate (6) is inclined. A ring-shaped first support plate (112) is fixedly provided at the bottom of the placement plate (111). The bottom of the first support plate (112) is inclined. The bottom of the first support plate (112) is fixedly connected to the top of the liquid outlet guide plate (6). The side of the tank (1) is provided with an outlet (113) corresponding to the lowest position of the liquid outlet guide plate (6). The first support plate (112) has a square clearance groove corresponding to the liquid outlet (113). The front side of the first support plate (112) is provided with a bent edge (114) towards the liquid outlet (113). Each bent edge (114) is fixedly connected to the tank body (1), the placement plate (111), and the liquid outlet guide plate (6).

2. The filter-washing combined filter according to claim 1, characterized in that: The bottom of the liquid outlet guide plate (6) is fixedly provided with a plurality of concentric circular second support plates (611). The tops of the plurality of second support plates (611) are all inclined. The bottoms of the plurality of second support plates (611) are flush with the bottom of the tank body (1). The bottom of the tank body (1) is fixedly provided with a sealing plate (115). The sealing plate (115) is fixedly connected to the plurality of second support plates (611). The bottom of the sealing plate (115) is fixedly provided with a support leg (116).

3. The filter that combines filtration and washing according to claim 2, characterized in that: The hydraulic lifting device (2) includes a hydraulic cylinder (211), three guide rods (212), a guide frame (213), three first linear bearings (214), and a second linear bearing (215). The hydraulic cylinder (211) and the three guide rods (212) are all flange-connected and fixed at the top of the tank (1). The top of the telescopic rod of the hydraulic cylinder (211) is fixedly connected to the bottom of the guide frame (213). The three first linear bearings (214) are fixedly located in the guide frame (213). The three guide rods (212) are slidably inserted into the three first linear bearings (214). The second linear bearing (215) is placed vertically in the middle of the guide frame (213). The stirring shaft (4) is inserted into the second linear bearing (215).

4. The filter that combines filtration and washing according to claim 3, characterized in that: The inner diameter of the first support plate (112) is the same as the inner diameter of the placement plate (111).

5. A filter combining filtration and washing according to claim 4, characterized in that: The angle between each of the bent edges (114) and the side corresponding to the outer diameter of the first support plate (112) is 135°.

6. A filter combining filtration and washing according to claim 5, characterized in that: A maintenance manhole (117) is provided on one side of the tank (1), and the maintenance manhole (117) is located above the five-layer sintered mesh filter plate (5).

7. A filter combining filtration and washing according to claim 6, characterized in that: The bottom of the stirring shaft (4) is fixedly provided with stirring blades (411).

8. A filter combining filtration and washing according to claim 7, characterized in that: The top of the tank (1) is fixedly provided with a mechanical seal (118), and the stirring shaft (4) is slidably inserted into the mechanical seal (118).

9. A filter combining filtration and washing according to claim 8, characterized in that: The top of the placement plate (111) is provided with an annular placement groove. The inner diameter of the placement groove is the same as the inner diameter of the placement plate (111). The outer diameter of the placement groove is 1.1 times the outer diameter of the five-layer sintered mesh filter plate (5). The bottom wall of the placement groove is provided with a plurality of first threaded through holes in a circular array. A sealing gasket is placed on the bottom wall of the placement groove. The tops of the first filter plate (511), the second filter plate (512), the third filter plate (513), the fourth filter plate (514), and the fifth filter plate (515) are provided with a plurality of first circular through holes corresponding to the first threaded through holes. The top of each first circular through hole is provided with a first chamfer. A first countersunk bolt (119) is fixed in each first circular through hole. Each first countersunk bolt (119) is threadedly connected to its corresponding first threaded through hole.

10. A filter combining filtration and washing according to claim 9, characterized in that: Several second circular perforations are arranged in an array from front to back on the top right side of the first filter plate (511), the second filter plate (512), the third filter plate (513), and the fourth filter plate (514), corresponding to the first opening. The bottom left side of the second filter plate (512), the third filter plate (513), the fourth filter plate (514), and the fifth filter plate (515) are provided with a number of second threaded perforations corresponding to a number of second circular perforations, arranged from front to back. Each of the second circular perforations has a second chamfer at the top; Each of the second circular through holes is fixed with a second countersunk bolt (120), and each of the second countersunk bolts (120) is threadedly connected to its corresponding second threaded through hole.

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