Scattering device

Abstract

The utility model discloses a scattering device which comprises a shell, a feeding pipe, a scattering sleeve cone and an air inlet pipe, a discharging opening is formed in the top of the shell, the discharging opening is communicated with a powder concentrator in the using state, a discharging pipe communicated with the shell is arranged at the bottom of the shell, and a discharging pipe air locking valve is arranged on the discharging pipe. The feeding pipe stretches into the shell from the upper portion of the shell and is bent downwards to be in a vertical shape after stretching into the shell, the scattering sleeve cone is arranged in the shell, the air inlet pipe stretches into the shell from the lower portion of the shell and is in a vertical shape in the shell, and the top end of the air inlet pipe is located under the scattering sleeve cone. Materials in the feeding pipe are discharged downwards and fall into the scattering sleeve cone to be scattered, fine powder is taken away by air of the air inlet pipe and discharged upwards from the discharging port to enter the powder concentrator, and coarse material particles fall downwards and are discharged from the discharging pipe. The technical defects that in the prior art, a V-shaped static powder concentrator is adopted as scattering equipment, the occupied space is large, air pipes are difficult to arrange, the airflow trend is not smooth, and energy consumption is high are overcome.

Description

Technical Field

[0001] The utility model relates to a dispersing device, belonging to the technical field of material sorting equipment. Background Art

[0002] In the grinding system of the cement building materials industry, generally a dispersing device is configured at the air inlet of the lower part of the classifier. The material passes through the dispersing device, so that the fine powder in the material is dispersed and is more easily carried by the air into the classifier for classification operation. The current common configuration is to use a V-type static classifier as the dispersing device. The main disadvantages of the V-type static classifier are irregular shape, large occupied space, difficult air duct layout during process arrangement, unsmooth air flow direction, increased system resistance, relatively complex structure and high energy consumption. Summary of the Invention

[0003] The purpose of the utility model is to provide a dispersing device to solve the technical defects of large occupied space, difficult air duct layout, unsmooth air flow direction and high energy consumption in the prior art when using a V-type static classifier as the dispersing device.

[0004] To solve the above problems, the technical solution adopted by the utility model is: a dispersing device, comprising a shell, a feed pipe, a dispersing sleeve cone and an air inlet pipe. An outlet is arranged at the top of the shell, and the outlet is communicated with the classifier in the use state. A discharge pipe communicated with the shell is arranged at the bottom of the shell, and a discharge pipe air lock valve is arranged on the discharge pipe. The feed pipe extends into the shell from the upper part of the shell and bends downward to be vertical after extending into the shell. The dispersing sleeve cone is arranged in the shell and is directly below the end of the feed pipe. The air inlet pipe extends into the shell from the lower part of the shell and is vertical inside the shell. The top end of the air inlet pipe is directly below the dispersing sleeve cone. The material in the feed pipe falls downward onto the dispersing sleeve cone and is dispersed. The fine powder is carried away by the air of the air inlet pipe and discharged upward from the outlet into the classifier, and the coarse material particles fall downward and are discharged from the discharge pipe. The utility model arranges the dispersing sleeve cone in the shell, and the feed pipe and the air inlet pipe are respectively located on the upper and lower sides of the dispersing sleeve cone. Therefore, the shell in the utility model can adopt a vertical cylindrical structure. Compared with the V-type structure in the prior art, the utility model occupies less space. The air inlet pipe only needs to be set in a vertical state inside the shell, so the layout of the utility model is simpler. In the utility model, the air flow flows upward from bottom to top, its direction is smooth, the system resistance is small, the power consumption is reduced, and the energy consumption of the utility model is lowered.

[0005] As a further improvement of the present utility model, it further includes a material blocking cone, which is arranged inside the housing and located between the dispersing sleeve cone and the air inlet pipe. The coarse material particles dispersed by the dispersing sleeve cone fall downward onto the material blocking cone, and then continue to fall downward from the periphery of the material blocking cone, avoiding the air outlet of the air inlet pipe. The material blocking cone is provided in the present utility model, so that the materials dispersed by the dispersing sleeve cone do not directly fall downward into the air inlet pipe, which is convenient for collecting coarse material particles and also avoids blocking the air inlet pipe due to excessive coarse material particles falling into the air inlet pipe.

[0006] As a further improvement of the present utility model, the material blocking cone includes an upper material blocking cone unit and a lower material blocking cone unit. The diameter of the upper end of the upper material blocking cone unit is smaller than that of the lower end, and the diameter of the upper end of the lower material blocking cone unit is larger than that of the lower end. The diameter of the lower end of the upper material blocking cone unit is equal to the diameter of the upper end of the lower material blocking cone unit, and the lower end of the upper material blocking cone is fixedly connected to the upper end of the lower material blocking cone. Multiple material blocking cone support columns are fixed on the air inlet pipe, and the lower material blocking cone unit is fixed at the top of the material blocking cone support columns. In the present utility model, the upper material blocking cone unit is used to disperse the coarse materials around to avoid the air outlet of the air inlet pipe, while the lower material blocking cone unit is used to blow the air blown out by the air inlet pipe upward from the periphery, reducing the resistance of the air flowing upward.

[0007] As a further improvement of the present utility model, the dispersing sleeve cone includes a guiding cylinder A, a guiding cylinder B, a spreading cone A, a spreading cone B and a spreading cone C. The spreading cone A is sleeved on the upper part of the guiding cylinder A and is fixed to the guiding cylinder A. The guiding cylinder A is fixed to the inner wall of the housing by multiple sleeve cone legs A. The guiding cylinder B is arranged inside the guiding cylinder A and is coaxially arranged with the guiding cylinder A. The guiding cylinder B is fixed inside the guiding cylinder A by multiple sleeve cone legs B. The bottom end of the guiding cylinder B extends downward out of the guiding cylinder A. The maximum diameter of the spreading cone B is smaller than the maximum diameter of the spreading cone A. The spreading cone B is sleeved and fixed on the lower part of the guiding cylinder B. The maximum diameter of the spreading cone C is smaller than the maximum diameter of the spreading cone B. The spreading cone C is fixedly connected to the bottom end of the guiding cylinder B by multiple material cone connecting rods. The coarse material particles in the present utility model fall downward onto the spreading cones A, B and C, and can more fully disperse the fine powder and the rough material particles, improving the dispersing effect of the present utility model.

[0008] As a further improvement of the present utility model, a plurality of cone sleeve supports are fixed on the inner wall of the housing. One end of the sleeve cone leg A away from the guiding cylinder A is fixedly connected to the cone sleeve support. The present utility model fixes the cone sleeve support on the inner wall of the housing, which is convenient for fixing the sleeve cone leg A to the housing.

[0009] As a further improvement of the present utility model, a part of the air inlet pipe located outside the housing is horizontal, and a collecting pipe communicating with the air inlet pipe is provided at the bottom of the bending part of the air inlet pipe, and a collecting pipe air lock valve is provided on the collecting pipe. The present utility model is provided with a collecting pipe on the air inlet pipe, and a small amount of coarse material particles falling into the air inlet pipe can be collected in the collecting pipe, and the collecting pipe air lock valve can be opened to clean them out in time.

[0010] As a further improvement of the present utility model, the bottom of the housing is inclined, and the side located on the discharge pipe side is inclined downward, and the coarse particles falling on the bottom of the housing slide toward the direction of the discharge pipe. In the present utility model, the inclined structure of the bottom of the housing facilitates the sliding and aggregation of the coarse material particles toward the direction of the discharge pipe, so as to facilitate the discharge of the coarse material particles from the discharge pipe.

[0011] As a further improvement of the present utility model, the housing includes an upper housing and a lower housing. The upper housing is cylindrical, the top of the lower housing is conical, the bottom end of the upper housing is fixedly connected to the top end of the lower housing, the dispersing sleeve cone is arranged in the upper housing, the feed pipe extends into the upper housing, and the air inlet pipe extends into the lower housing from the bottom of the lower housing. In the present utility model, the housing is composed of two parts, which is convenient for the installation of each component in the housing.

[0012] As a further improvement of the present utility model, a maintenance door is provided on the upper housing at the position of the dispersing sleeve cone, and the maintenance door is opened for entering and exiting the housing. The present utility model is provided with a maintenance door, which is convenient for entering and exiting the housing, so as to perform maintenance and cleaning on the present utility model.

[0013] As a further improvement of the present utility model, a plurality of housing supports are fixed on the outer surface of the lower housing, which are used to fix the housing to a fixed object in the use state. The present utility model is provided with housing supports, which is convenient for the fixation during the use of the present utility model.

[0014] In summary, the beneficial effects of the present utility model are as follows: The present utility model is provided with a dispersing sleeve cone in the housing, and the feed pipe and the air inlet pipe are respectively located on the upper and lower sides of the dispersing sleeve cone. Therefore, the housing in the present utility model can adopt a vertical cylindrical structure. Compared with the V-shaped structure in the prior art, the present utility model occupies less space. The air inlet pipe only needs to be set in a vertical state in the housing, so the layout of the present utility model is simpler. In the present utility model, the air flow flows upward from bottom to top, and its flow direction is smooth, the system resistance is small, the power consumption is reduced, and the energy consumption of the present utility model is lowered. Description of the Drawings

[0015] Figure 1 is the structural schematic diagram of the present utility model.

[0016] Figure 2 is the schematic diagram showing the structure at the dispersing sleeve cone in the present utility model.

[0017] Figure 3 is Figure 1 the A-A sectional view of

[0018] Wherein: 1. housing; 2. feed pipe; 3. dispersing sleeve cone; 4. air inlet pipe; 5. discharge port; 6. discharge pipe; 7. air lock valve of discharge pipe; 8. baffle cone; 9. upper baffle cone unit; 10. lower baffle cone unit; 11. baffle cone support pillar; 12. guide cylinder A; 13. guide cylinder B; 14. spreading cone A; 15. spreading cone B; 16. spreading cone C; 17. sleeve cone support leg A; 18. sleeve cone support leg B; 19. cone connecting rod; 20. cone sleeve support; 21. collecting pipe; 22. air lock valve of collecting pipe; 23. upper housing; 24. lower housing; 25. inspection door; 26. housing support. Specific embodiments

[0019] The following further describes the specific embodiments of the present invention in conjunction with the accompanying drawings. Embodiment 1

[0020] As Figures 1 to 3 shown, the dispersing device includes a housing 1, a feed pipe 2, a dispersing sleeve cone 3 and an air inlet pipe 4. A discharge port 5 is provided at the top of the housing 1. In the use state, the discharge port 5 communicates with the powder separator. In this embodiment, in the use state, the housing 1 can be directly connected to the powder inlet flange of the powder separator, or can be connected to the powder inlet of the powder separator by a pipeline. A discharge pipe 6 communicating with the housing 1 is provided at the bottom of the housing 1. The discharge pipe 6 is fixedly welded to the housing 1. In this embodiment, an air lock valve 7 of the discharge pipe is provided on the discharge pipe 6. Closing the air lock valve 7 of the discharge pipe can ensure that there is no air leakage in the use state and affect the system stability. The feed pipe 2 extends into the housing 1 from the upper part of the housing 1 and bends downward to be vertical after extending into the housing 1. The dispersing sleeve cone 3 is arranged in the housing 1 and is directly below the end of the feed pipe 2. The material in the feed pipe 2 falls downward onto the dispersing sleeve cone 3 and is dispersed. The air inlet pipe 4 extends into the housing 1 from the lower part of the housing 1, and the part of the air inlet pipe 4 inside the housing 1 is vertical. The top end of the air inlet pipe 4 is directly below the dispersing sleeve cone 3. The center line of the vertical part of the air inlet pipe 4 coincides with the center line of the vertical part of the feed pipe 2. The material in the feed pipe 2 is discharged downward onto the dispersing sleeve cone 3 and is dispersed. The fine powder after dispersion is carried away by the air in the air inlet pipe 4 and discharged upward from the discharge port 5 into the powder separator, while the remaining heavier coarse material particles fall downward and are discharged from the discharge pipe 6, realizing the dispersion of fine powder and coarse material particles. After the fine powder enters the powder separator, it is sorted again.

[0021] As Figure 2As shown in the figure, the dispersion sleeve cone 3 in this embodiment includes a material guiding cylinder A12, a material guiding cylinder B13, a material spreading cone A14, a material spreading cone B15, and a material spreading cone C16. The material spreading cone A14 is sleeved on the upper part of the material guiding cylinder A12 and is fixedly welded to the material guiding cylinder A12. In this embodiment, the outer diameter of the material guiding cylinder B13 is smaller than the inner diameter of the material guiding cylinder A12, and an annular coarse material channel A is formed between the inner surface of the material guiding cylinder A12 and the outer surface of the material guiding cylinder B13. The material guiding cylinder A12 is fixed on the inner wall of the housing 1 by multiple sleeve cone legs A17. In this embodiment, preferably, four sleeve cone legs A17 evenly distributed in the circumferential direction are used to fix the material guiding cylinder A12 on the inner wall of the housing 1, and the sleeve cone legs A17 and the material guiding cylinder A12 are fixed by welding. The material guiding cylinder B13 is arranged inside the material guiding cylinder A12 and is coaxially arranged with the material guiding cylinder A12. The material guiding cylinder B13 is fixed inside the material guiding cylinder A12 by multiple sleeve cone legs B18. In this embodiment, four sleeve cone legs B18 evenly distributed in the circumferential direction are used to fixedly connect with the material guiding cylinder B13 at both the upper and lower ends of the inner surface of the material guiding cylinder A12. The length of the material guiding cylinder B13 is greater than the length of the material guiding cylinder A12, and the bottom end of the material guiding cylinder B13 extends downward out of the material guiding cylinder A12. The maximum diameter of the material spreading cone B15 is smaller than the maximum diameter of the material spreading cone A14. The material spreading cone B15 is sleeved and fixedly welded to the lower part of the material guiding cylinder B13. The material falling from the coarse material channel A onto the material spreading cone B15 is dispersed again. The central through hole of the material guiding cylinder B13 constitutes the coarse material channel B. The maximum diameter of the material spreading cone C16 is smaller than the maximum diameter of the material spreading cone B15. The material spreading cone C16 is fixedly connected to the bottom end of the material guiding cylinder B13 by multiple material cone connecting rods 19. In this embodiment, the coarse material in the coarse material channel B falls onto the material spreading cone C16 and is dispersed again, thereby improving the dispersion effect of the fine powder and coarse particles in the material and enabling the fine powder to fully enter the powder separator.

[0022] As Figure 1 and Figure 2 shown, for the convenience of fixing the sleeve cone leg A17 to the housing 1, in this embodiment, a plurality of cone sleeve supports 20 are fixedly welded to the inner wall of the housing 1 evenly in the circumferential direction. One end of the sleeve cone leg A17 away from the material guiding cylinder A12 is fixedly connected to the cone sleeve support 20. In this embodiment, the number of the cone sleeve supports 20 is equal to the number of the sleeve cone legs A17. Embodiment 2

[0023] This embodiment is a further improvement based on Embodiment 1. Compared with Embodiment 1, this embodiment is additionally provided with a baffle cone 8, as Figure 1As shown in the figure, the material blocking cone 8 is arranged inside the housing 1, and the material blocking cone 8 is located between the dispersion sleeve cone 3 and the air inlet pipe 4. There are spaces between the material blocking cone 8 and the dispersion sleeve cone 3, and between the material blocking cone 8 and the air inlet pipe 4. The coarse material particles dispersed by the dispersion sleeve cone 3 fall downward onto the material blocking cone 8, and then continue to fall downward from the periphery of the material blocking cone 8, avoiding the air outlet of the air inlet pipe 4. The air blown out by the air inlet pipe 4 is blocked by the material blocking cone 8 and flows upward from the periphery of the material blocking cone 8, reducing the amount of coarse particles entering the air inlet pipe 4.

[0024] As Figure 1 shown in the figure, the material blocking cone 8 in this embodiment includes an upper material blocking cone unit 9 and a lower material blocking cone unit 10. The diameter of the upper end of the upper material blocking cone unit 9 is smaller than that of the lower end, and the diameter of the upper end of the lower material blocking cone unit 10 is larger than that of the lower end. Moreover, the diameter of the lower end of the upper material blocking cone unit 9 is equal to the diameter of the upper end of the lower material blocking cone 8. The lower end of the upper material blocking cone 8 is fixedly connected to the upper end of the lower material blocking cone 8, such as by welding. In this embodiment, a plurality of material blocking cone support columns 11 are fixedly welded along the circumferential direction on the air inlet pipe 4. The bottom end of the material blocking cone support column 11 is fixed to the air inlet pipe 4, and the lower material blocking cone unit 10 is fixedly welded to the top end of the material blocking cone support column 11. The material blocking cone support column 11 supports the material blocking cone 8 above the air inlet pipe 4. The structure of the remaining part in this embodiment is the same as that in Embodiment 1, and specific details can be referred to Embodiment 1, which will not be elaborated in this embodiment. Embodiment 3

[0025] This embodiment is a further improvement on Embodiment 2. Compared with Embodiment 2, a part of the air inlet pipe 4 located outside the housing 1 is horizontal, and an aggregate pipe 21 communicating with the air inlet pipe 4 is arranged at the bottom of the bending part of the air inlet pipe 4. The aggregate pipe 21 is fixedly welded to the air inlet pipe 4 and communicates with the air inlet pipe 4. An aggregate pipe air lock valve 22 is arranged on the aggregate pipe 21. As Figure 1 shown in the figure, when this embodiment is in use, some of the coarse material particles that fall into the air inlet pipe 4 can be discharged from the aggregate pipe 21, and the arrangement of the aggregate pipe air lock valve 22 can effectively prevent air leakage from the aggregate pipe 21. By opening the aggregate pipe air lock valve 22, the coarse material particles can be discharged. The structure of the remaining part in this embodiment is the same as that in Embodiment 2, and specific details can be referred to Embodiment 2, which will not be elaborated in this embodiment. Embodiment 4

[0026] This embodiment is a further improvement based on Embodiment 3. Compared with Embodiment 3, the bottom of the housing 1 in this embodiment is inclined, with one side located on the side of the discharge pipe 6 inclined downward. In this way, the coarse particles that fall downward onto the bottom of the housing 1 can slide along the inclined surface towards the direction of the discharge pipe 6.

[0027] As Figure 1As shown in the figure, the housing 1 in this embodiment includes an upper housing 23 and a lower housing 24. The upper housing 23 is cylindrical, the top of the lower housing 24 is conical, the bottom of the lower housing 24 is closed and inclined, and the bottom end of the upper housing 23 is fixedly connected to the top end of the lower housing 24. In this embodiment, the upper housing 23 and the lower housing 24 are flange-connected. Among them, the dispersion sleeve cone 3 is arranged in the upper housing 23, the feed pipe 2 extends into the upper housing 23, and the air inlet pipe 4 extends into the lower housing 24 from the bottom of the lower housing 24. In order to facilitate the maintenance of this embodiment, a maintenance door 25 is provided on the upper housing 23 at the position of the dispersion sleeve cone 3. Opening the maintenance door 25 is used to enter and exit the housing 1, so as to perform maintenance and cleaning on the interior of the embodiment. In order to facilitate the fixation of this embodiment, as Figure 3 shown, a plurality of housing supports 26 are fixed on the outer surface of the lower housing 24 in this embodiment. The housing supports 26 are used to fix the housing 1 to a fixed object in the use state. For example, the housing supports 26 are fixed on the support frame by bolts, so as to fix this embodiment. The structure of the remaining part of this embodiment is the same as that of Embodiment 3, and specific reference can be made to Embodiment 3, which will not be elaborated in this embodiment.

[0028] Parts not specifically described in the above description are all prior art or can be realized through prior art. Moreover, the specific implementation cases described in this utility model are only the preferred implementation cases of the present invention, and are not used to limit the implementation scope of the present utility model. That is, equivalent changes and modifications made according to the content of the scope of the patent of the present utility model should all be regarded as the technical scope of the present utility model.

Claims

1. A breaking device, characterized in that: The invention comprises a shell (1), a feed pipe (2), a scattering cone (3) and an air inlet pipe (4); a discharge port (5) is provided at the top of the shell (1); the discharge port (5) is connected to a powder selector when in use; a discharge pipe (6) is provided at the bottom of the shell (1) and is connected to the shell (1); a discharge pipe air lock valve (7) is provided on the discharge pipe (6); the feed pipe (2) extends from the upper part of the shell (1) into the shell (1) and is bent downward to be vertical after being extended into the shell (1); the scattering cone (3) is provided at the bottom of the shell (1) and is connected to the powder selector when in use; The housing (1) is located directly below the end of the feed pipe (2). The air inlet pipe (4) extends from the lower part of the housing (1) into the housing (1) and is vertically arranged inside the housing (1). The top end of the air inlet pipe (4) is located directly below the scattering cone (3). The material in the feed pipe (2) falls downward to the scattering cone (3) and is dispersed. The fine powder is carried away by the wind from the air inlet pipe (4) and is discharged upward from the discharge port (5) into the powder classifier. The coarse material particles fall downward and are discharged from the discharge pipe (6).

2. The breaking device according to claim 1, characterized in that: The invention also comprises a material blocking cone (8), which is arranged in the housing (1) and is located between the scattering cone (3) and the air inlet pipe (4). The coarse material particles dispersed by the scattering cone (3) fall downward onto the material blocking cone (8), and then continue to fall downward from the surrounding of the material blocking cone (8) and avoid the air outlet of the air inlet pipe (4).

3. The breaking device according to claim 2, characterized in that: The material stopper cone (8) comprises an upper material stopper cone unit (9) and a lower material stopper cone unit (10); the diameter of the upper end of the upper material stopper cone unit (9) is smaller than the diameter of the lower end; the diameter of the upper end of the lower material stopper cone unit (10) is larger than the diameter of the lower end; the diameter of the lower end of the upper material stopper cone unit (9) is equal to the diameter of the upper end of the lower material stopper cone (8); the lower end of the upper material stopper cone (8) is fixedly connected to the upper end of the lower material stopper cone (8); a plurality of material stopper cone pillars (11) are fixed on the air inlet pipe (4); and the lower material stopper cone unit (10) is fixed to the top of the material stopper cone pillar (11).

4. The breaking device according to claim 1, characterized in that: The scattering cone (3) comprises a material guide cylinder A (12), a material guide cylinder B (13), a material spreading cone A (14), a material spreading cone B (15) and a material spreading cone C (16). The material spreading cone A (14) is sleeved on the upper part of the material guide cylinder A (12) and is fixed to the material guide cylinder A (12). The material guide cylinder A (12) is fixed to the inner wall of the housing (1) by a plurality of cone legs A (17). The material guide cylinder B (13) is arranged in the material guide cylinder A (12) and is coaxially arranged with the material guide cylinder A (12). The material guide cylinder B (13) is The root cone leg B (18) is fixed in the material guide barrel A (12), the bottom end of the material guide barrel B (13) extends downward from the material guide barrel A (12), the maximum diameter of the spreading cone B (15) is smaller than the maximum diameter of the spreading cone A (14), the spreading cone B (15) is sleeved and fixed on the lower part of the material guide barrel B (13), the maximum diameter of the spreading cone C (16) is smaller than the maximum diameter of the spreading cone B (15), and the spreading cone C (16) is fixedly connected to the bottom end of the material guide barrel B (13) by using a plurality of cone connecting rods (19).

5. The breaking device according to claim 4, characterized in that: A plurality of cone sleeve supports (20) are fixed to the inner wall of the housing (1), and one end of the cone sleeve support leg A (17) away from the material guide cylinder A (12) is fixedly connected to the cone sleeve support (20).

6. The breaking device according to claim 1, characterized in that: A portion of the air inlet pipe (4) located outside the housing (1) is horizontal, and a collecting pipe (21) communicating with the air inlet pipe (4) is provided at the bottom of the bend of the air inlet pipe (4), and a collecting pipe air lock valve (22) is provided on the collecting pipe (21).

7. The breaking device according to claim 1, characterized in that: The bottom of the shell (1) is arranged to be inclined, wherein one side located at the discharge pipe (6) is inclined downward, and the coarse particles dropped onto the bottom of the shell (1) slide towards the discharge pipe (6).

8. The breaking device according to claim 1, characterized in that: The shell (1) comprises an upper shell (23) and a lower shell (24); the upper shell (23) is cylindrical, the top of the lower shell (24) is conical, the bottom end of the upper shell (23) is fixedly connected to the top end of the lower shell (24), the breaking cone (3) is arranged in the upper shell (23), the feed pipe (2) extends into the upper shell (23), and the air inlet pipe (4) extends from the bottom of the lower shell (24) into the lower shell (24).

9. The breaking device according to claim 8, characterized in that: An inspection door (25) is provided on the upper shell (23) at the location where the breaking cone sleeve (3) is formed. The inspection door (25) is opened for entering and exiting the shell (1).

10. The breaking device according to claim 8, characterized in that: A plurality of housing supports (26) are fixed on the outer surface of the lower housing (24) and are used to fix the housing (1) to a fixed object when in use.

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