Five-degree-of-freedom general flexible rail car for equipment installation

Abstract

According to the five-degree-of-freedom universal flexible rail car for equipment installation, the problem that the installation efficiency and precision of a simple rail car are not high is solved. Comprising a rail wheel assembly (100), a brake assembly (200), a lower frame (300), a detachable frame (500), an upper frame (600), a two-degree-of-freedom assembly (700), a supporting plate supporting seat (800), a horizontal adjusting mechanism (900), a rotary adjusting assembly (1000), a selectively-installed stabilizing assembly (400) and a counterweight assembly (1100) which are sequentially installed from bottom to top, the brake assembly (200) is installed on the lower frame (300), the stabilizing assembly (400) is connected to the lower frame (300), and the detachable frame (500) is installed on the upper frame (600). The balance weight assembly (1100) is connected to the supporting plate supporting seat (800), the two-degree-of-freedom assembly (700) is used for adjusting the degree of freedom of Y-direction translation, Z-direction translation and rotation around the Y axis, the horizontal adjusting mechanism (900) is used for adjusting the degree of freedom of X-direction translation, and the rotation adjusting assembly (1000) is used for adjusting the degree of freedom of rotation around the X axis. The structure can effectively improve the efficiency and quality of field equipment installation of workers, and is suitable for production and butt joint of large and small batches of equipment.

Description

Technical Field

[0001] The present invention relates to a universal track vehicle for equipment installation, adjustment and rotation with multiple degrees of freedom. The mechanism has five degrees of freedom, namely, X, Y, Z translation and rotation around the X axis and the Y axis. Compared with conventional equipment installation vehicles, the degrees of freedom are greatly improved, the equipment installation vehicle is made universal, modular and flexible, and the work efficiency and installation quality are improved. Background Art

[0002] The commonly used equipment installation vehicle is a simple rail-mounted vehicle. Due to its insufficient degree of freedom, it requires auxiliary equipment or tooling to be used, which increases costs. Secondly, since the equipment installation vehicle has a low degree of freedom, the installation position needs to be repeatedly adjusted manually, and the installation efficiency and accuracy are not high. Summary of the invention

[0003] The present invention solves the problem of low installation efficiency and precision of simple track driving by designing a five-degree-of-freedom universal flexible track vehicle for equipment installation.

[0004] The present invention is achieved by the following technical solutions:

[0005] A universal flexible rail vehicle with five degrees of freedom for equipment installation comprises a rail wheel assembly 100, a brake assembly 200, a lower frame 300, a detachable frame 500, an upper frame 600, a two-degree-of-freedom assembly 700, a pallet support seat 800, a horizontal adjustment mechanism 900, a rotation adjustment assembly 1000 and selectively installable stabilization assembly 400 and a counterweight assembly 1100, which are sequentially installed from bottom to top. The brake assembly 200 is installed on the lower frame 300, the stabilization assembly 400 is connected to the lower frame 300, the counterweight assembly 1100 is connected to the pallet support seat 800, the two-degree-of-freedom assembly 700 is used to adjust the degrees of freedom of Y-direction translation, Z-direction translation, and rotation around the Y-axis, the horizontal adjustment mechanism 900 is used to adjust the degrees of freedom of X-direction translation, and the rotation adjustment assembly 1000 is used to adjust the degrees of freedom of rotation around the X-axis.

[0006] The detachable frame 500 is a stacking type installation frame, and you can choose whether to install it or how many to install according to your needs.

[0007] The device can be installed on the flange at the end of the rotation adjustment assembly 1000, or it can be installed on the flat plate of the pallet support seat 800. When the device is installed on the flat plate of the pallet support seat 800, the horizontal adjustment mechanism 900, the rotation adjustment assembly 1000 and the counterweight assembly 1100 need to be removed.

[0008] The two-degree-of-freedom assembly 700 includes a two-degree-of-freedom assembly mounting plate 707, a guide rail slider assembly 706 mounted on the two-degree-of-freedom assembly mounting plate 707, an elevator mounting plate 705 slidingly connected to the guide rail slider assembly 706, an elevator 704 mounted on the elevator mounting plate 705, a screw support assembly 702 fixedly connected to the two-degree-of-freedom assembly mounting plate 707, a screw assembly 703 connected to the screw support assembly 702 and the elevator mounting plate 705 via a screw and a nut, a Y-axis moving handwheel 701 fixedly connected to the screw assembly 703, and an elevator handwheel 708 connected to the elevator 704.

[0009] There are two elevators 704, which are connected by an elevator connecting rod 709 and a coupling 710, and are lifted and lowered simultaneously by the rotation of an elevator hand wheel 708.

[0010] The horizontal adjustment mechanism 900 includes a lower mounting plate 905 and an upper mounting plate 906, and a guide rail slider assembly 904 is installed between the lower mounting plate 905 and the upper mounting plate 906. The screw support assembly 902 is fixedly connected to the lower mounting plate 905, and the screw assembly 903 is connected to the upper mounting plate 906 through a screw and a nut. The rotating handwheel 901 is fixedly connected to the screw assembly 903.

[0011] The rotation adjustment assembly 1000 includes a mounting plate 1001, a reducer mounting bracket 1002, an intermediate bearing mounting seat assembly 1003, a front end bearing seat mounting assembly 1004, a reducer 1005, an adapter shaft assembly 1006, a bearing 1 1007, a shaft 1009, a bearing 2 1010, an end flange 1012, a handwheel 1014 and a handwheel mounting shaft 1015. The reducer mounting bracket 1002, the intermediate bearing mounting seat assembly 1003 and the front end bearing seat mounting assembly 1004 are fixedly mounted on the mounting plate 1001. 001, the reducer 1005 is installed on the reducer mounting bracket 1002, the intermediate bearing mounting seat assembly 1003 and the front end bearing seat mounting assembly 1004 are respectively installed with bearing 1 1007 and bearing 2 1010, the shaft 1009 is installed in the bearing 1 1007 and the bearing 2 1010, one end is fixedly connected to the reducer 1005 through the adapter shaft assembly 1006, and the other end is fixedly connected to the end flange 1012 of the mounting equipment, and the handwheel 1014 is connected to the reducer 1005 through the handwheel mounting shaft 1015.

[0012] The stabilizing assembly 400 is welded into a frame shape by profile 402, with a counterweight mounting rod 407 welded in the middle, a mounting plate 401 for connecting with the lower frame 300 is welded at one end of the frame, and a lifting rod 404 is welded at the other end, a support foot 403 is installed at the bottom end of the lifting rod 404, and a handle 405 is installed at the top end, and a mounting hole for installing the counterweight is formed on the counterweight mounting rod 407.

[0013] The brake assembly 200 includes a handwheel 201, a mounting standard part 202, a clamping screw 203, a mounting bracket 204, a brake plate 205 and a brake rubber 206. The mounting bracket 204 is installed on the lower frame 300 through the mounting standard part 202. The clamping screw 203 with the handwheel 201 is threadedly connected to the mounting bracket 204. The brake plate 205 is installed at the lower end of the clamping screw 203. The brake rubber 206 is installed on the brake plate 205.

[0014] The pallet support seat 800 includes a profile 801, two two-degree-of-freedom component connecting joints and a mounting plate 803. The mounting plate 803 is welded to the profile 801. The two-degree-of-freedom component connecting joint is installed on the mounting plate 803. The two-degree-of-freedom component connecting joint is provided with a circular hole or an oblong hole. The mounting plate 803 is provided with a coordinate system and array holes for providing standardized mounting hole positions, on which a horizontal adjustment mechanism 900 and a rotation adjustment component 1000 are installed.

[0015] The structure of the present invention can effectively improve the efficiency and quality of workers' on-site equipment installation, and is suitable for production docking of large and small batch equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic diagram of a multi-degree-of-freedom track driving structure;

[0017] Figure 2 is a structural diagram of a rail wheel assembly 100;

[0018] Figure 3 is a structural diagram of a brake assembly 200;

[0019] Figure 4 is a structural diagram of the lower frame 300;

[0020] Figure 5 is a structural diagram of a stabilizing assembly 400;

[0021] Figure 6 is a structural diagram of a detachable frame 500;

[0022] Figure 7 is a structural diagram of the upper frame 600;

[0023] Figure 8 is a structural diagram of a two-degree-of-freedom assembly 700;

[0024] Fig. 9 It is a structural diagram of the pallet support seat 800;

[0025] Fig.10 is a structural diagram of the horizontal adjustment mechanism 900;

[0026] FIG11 is a structural diagram of the rotation adjustment assembly 1000;

[0027] Fig.12 1100 is a structural diagram of the counterweight assembly 1100. DETAILED DESCRIPTION

[0028] In order to facilitate the description of direction, the X-axis and Z-axis directions of this rail vehicle are defined as follows Figure 1b As shown, the coordinate system is a Cartesian coordinate system, so the direction of the Y-axis (not marked) is perpendicular to the paper and inward.

[0029] The present invention adopts the following technical solution:

[0030] (1) The overall design concept of the multifunctional DOF track driving vehicle is divided into (from bottom to top): a track wheel assembly 100, a brake assembly 200, a lower frame 300, a stabilizing assembly 400, a detachable frame 500, an upper frame 600, a two-DOF assembly 700, a pallet support seat 800, a horizontal adjustment mechanism 900, a rotation adjustment assembly 1000, and a counterweight assembly 1100;

[0031] (2) This rail car is used to assist in the installation of equipment. According to specific needs, the equipment can be installed on the flange at the end of the rotation adjustment component 1000, or on the flat plate of the pallet support seat 800 (in this case, the pallet support seat 800, the horizontal adjustment mechanism 900, the rotation adjustment component 1000, and the counterweight component 1100 need to be removed). The equipment can be adjusted and installed by adjusting the hand wheel of the rail car;

[0032] (3) The rail wheel assembly 100, the brake assembly 200, the lower frame 300, the detachable frame 500, and the upper frame 600 together form the frame body. The stabilizing assembly 400 is used to increase the stability of the vehicle body, and it can be selected whether to install it according to the specific usage scenario; the detachable frame 500 is a stacking installation frame, and it can be selected whether to install it or how many to install according to the needs;

[0033] (4) The two-degree-of-freedom assembly 700 is used to adjust the degrees of freedom of Y-axis translation, Z-axis translation, and rotation about the Y axis;

[0034] (5) The horizontal adjustment mechanism 900 is used to adjust the degree of freedom of translation in the X direction;

[0035] (6) The rotation adjustment assembly 1000 is used to adjust the degree of freedom of rotation around the X-axis.

[0036] The system is further described in detail below with reference to Figures 1-12.

[0037] 1 Overall structure

[0038] The rail vehicle is composed of: a rail wheel assembly 100, a brake assembly 200, a lower frame 300, a stabilizing assembly 400, a detachable frame 500, an upper frame 600, a two-degree-of-freedom assembly 700, a pallet support seat 800, a horizontal adjustment mechanism 900, a rotation adjustment assembly 1000, and a counterweight assembly 1100.

[0039] The track wheel assembly 100 is embedded in the track to complete long-distance movement along the X direction; the brake assembly 200 is installed on the frame, and the track wheel assembly 100 can be held tightly by rotating the brake handwheel to realize the braking function; the lower frame 300, the stabilizing assembly 400, the detachable frame 500, and the upper frame 600 constitute the main body of the frame, and the stabilizing assembly 400 can be installed according to the actual use scenario; the two-degree-of-freedom assembly 700, the horizontal adjustment mechanism 900, and the rotation adjustment assembly 1000 are used to adjust the five degrees of freedom of the vehicle body, and the adjustment function is realized by turning the handwheel; the counterweight assembly 1100 is a component for adjusting the overall center of gravity, and it can be installed according to actual needs. In addition, the horizontal adjustment mechanism 900 and the rotation adjustment assembly 1000 can be installed according to needs. If the equipment to be installed has the need for translation along the X-axis and rotation adjustment around the X-axis, it is necessary to install components 900 and 1000. Otherwise, there is no need to install components 900 and 1000, and the equipment can be installed on the pallet support seat 800.

[0040] 2 Track wheel assembly 100

[0041] As shown in the figure, the track wheel assembly 100 is composed of a bearing end cover 101, a nut 102, a bearing 103, a track wheel 104, a baffle 105, a connecting shaft head 106, a connecting shaft 107, a positioning pin 108, a connecting plate 109, etc. The track wheel assembly 100 can travel on the track, and the track wheel assembly 100 is connected to the vehicle body as a whole through the connecting plate 109.

[0042] 3 brake components 200

[0043] The brake assembly 200 is composed of a hand wheel 201, a mounting standard 202, a clamping screw 203, a mounting bracket 204, a brake plate 205, a brake rubber 206, etc. The brake assembly 200 is mounted on the lower frame 300, and the brake plate 205 is moved by rotating the hand wheel 201, and the brake rubber 206 is pressed against the track wheel assembly 100 to achieve braking.

[0044] 4 Lower frame 300

[0045] The lower frame 300 is welded from profiles 303 into a rectangular structure. The lower welded connecting plate 302 is used to connect with the track wheel assembly 100 , the upper welded connecting plate 304 is used to connect with the detachable frame 500 , and the side welded connecting plate 301 is used to install the brake assembly 200 .

[0046] 5 Stabilizing components 400

[0047] The stabilizing assembly 400 is formed by welding the profile 402 and the counterweight mounting rod 407, and is welded with a mounting plate 401 for connecting with the lower frame 300, and a welded connecting plate 406 for mounting the support legs 403, the lifting rod 404, and the handle 405. The counterweight mounting rod 407 is provided with mounting holes for mounting the counterweight 1103 (which is common to the counterweight 1103 in the counterweight assembly 1100). It should be emphasized that the stabilizing assembly 400 can be mounted with the counterweight of the counterweight assembly 1100, and the mounting position of the counterweight can be selected according to actual needs.

[0048] 6 removable frames 500

[0049] The detachable frame 500 is formed by welding a mounting plate 501, a mounting plate 502, and a profile 503. The mounting plate 501 is used to connect with the lower frame 300, and the mounting plate 502 is used to connect with the upper frame 600.

[0050] 7 Upper frame 600

[0051] The upper frame 600 is formed by welding a mounting plate 601, a profile 602, and a mounting plate 603. The mounting plate 601 is used to connect with the detachable frame 500, and the mounting plate 603 is used to install the two-degree-of-freedom assembly 700.

[0052] 8 2-DOF Components 700

[0053] The two-degree-of-freedom assembly 700 is used to adjust the degrees of freedom of Y-axis translation, Z-axis translation, and rotation around the Y axis, and the posture adjustment is completed by two groups. Its core components include a Y-axis moving hand wheel 701, a screw support assembly 702, a screw assembly 703, an elevator 704, an elevator mounting plate 705, a guide rail slider assembly 706, a two-degree-of-freedom assembly mounting plate 707, an elevator hand wheel 708, an elevator connecting rod 709, and a coupling 710.

[0054] The two-degree-of-freedom assembly 700 is installed on the upper frame 600. The Y-direction moving handwheels 701 of the two-degree-of-freedom assembly 700 are rotated in the same direction at the same time, and the Y-direction translation of the mechanism is realized through the transmission of the guide rail slider assembly 705. The elevator handwheels 707 of the two-degree-of-freedom assembly 700 are rotated in the same direction at the same time, and the Z-direction translation is realized through the transmission of the elevator 703. The elevator handwheels 707 of the two-degree-of-freedom assembly 700 are rotated in the opposite direction at the same time, and the rotation around the Y axis is realized through the transmission of the elevator 703.

[0055] 9 pallet support seat 800

[0056] The support plate support seat 800 is composed of a profile 801, a two-degree-of-freedom component connection joint 802, a mounting plate 803, a two-degree-of-freedom component connection joint 804, etc. The connection feature of the two-degree-of-freedom component connection joint 802 can be but not limited to a circular hole, and the connection feature of the two-degree-of-freedom component connection joint can be but not limited to an oblong hole. A coordinate system and an array hole can be set on the mounting plate 803 to provide a standardized mounting hole position.

[0057] The pallet support seat 800 is installed on the two-degree-of-freedom component 700, and has two functions: one is that the equipment can be directly installed on it, and the other is that the horizontal adjustment mechanism 900 and the rotation adjustment component 1000 are installed on it and used in conjunction with the two components.

[0058] 10 Level adjustment mechanism 900

[0059] The horizontal adjustment mechanism 900 is used to adjust the freedom of X-axis translation, and is composed of a hand wheel 901, a screw support assembly 902, a screw assembly 903, a guide rail slider assembly 904, a lower mounting plate 905, an upper mounting plate 906, etc. This assembly is mounted on the pallet support seat 800 through the lower mounting plate 905, and is connected to the rotation adjustment assembly 1000 through the upper mounting plate 906.

[0060] The hand wheel 901 is rotated, and the screw assembly 903 and the guide rail slider assembly 904 are driven to realize translation along the X direction.

[0061] 11 Rotation adjustment assembly 1000

[0062] The rotation adjustment assembly 1000 is composed of a mounting plate 1001, a reducer mounting bracket 1002, an intermediate bearing mounting seat assembly 1003, a front end bearing seat mounting assembly 1004, a reducer 1005, an adapter shaft assembly 1006, a bearing 1 1007, a bearing 1 end cover 1008, a shaft 1009, a bearing 2 1010, a bearing 2 end cover 1011, an end flange 1012, equipment mounting screws 1013, a handwheel 1014, a handwheel mounting shaft 1015, etc.

[0063] The reducer mounting bracket 1002, the intermediate bearing mounting seat assembly 1003, and the front bearing seat mounting assembly 1004 are used to install the reducer and the bearing assembly. The end flange 1012 is used to install the equipment to be installed, and the equipment is installed on the end flange 1012 through the equipment mounting screws 1013. The hand wheel 1014 is rotated to drive the end flange 1012 to rotate through the reducer 1005, thereby realizing the freedom of rotation around the X axis.

[0064] 12 Counterweight assembly 1100

[0065] The counterweight assembly 1100 is composed of a profile 1101, a mounting plate 1102, a counterweight block 1103, a lifting bolt 1104, a counterweight block connecting bolt 1105, etc., and is installed on the pallet support seat 800. The counterweight block 1103 is a block-type structure, and the number of counterweight blocks used can be set according to the actual counterweight requirements. According to the actual use scenario requirements, the counterweight block 1103 can also be installed on the stabilizing assembly 400. The lifting bolt 1104 is used when disassembling the counterweight block 1103.

[0066] The multi-degree-of-freedom universal flexible rail vehicle for equipment installation designed by the present invention fully considers the practical problems encountered by workers during on-site installation, such as low degrees of freedom, precision fine-tuning, distance compensation, height lifting and lowering restrictions, and realizes the universalization of equipment installation vehicles, reducing costs. The overall operation of the rail vehicle is simple, the structure is simplified, and it is a low-cost solution, which is suitable for the docking production of large and small batches of equipment.

Claims

1. A five-degree-of-freedom universal flexible rail vehicle for equipment installation, characterized by: The invention comprises a track wheel assembly (100), a brake assembly (200), a lower frame (300), a detachable frame (500), an upper frame (600), a two-degree-of-freedom assembly (700), a pallet support seat (800), a horizontal adjustment mechanism (900), a rotation adjustment assembly (1000), and a selectively installable stabilization assembly (400) and a counterweight assembly (1100), which are installed in sequence from bottom to top. The brake assembly (200) is installed on the lower frame (300), the stabilization assembly (400) is connected to the lower frame (300), the counterweight assembly (1100) is connected to the pallet support seat (800), the two-degree-of-freedom assembly (700) is used to adjust the degrees of freedom of Y-direction translation, Z-direction translation, and rotation around the Y axis, the horizontal adjustment mechanism (900) is used to adjust the degrees of freedom of X-direction translation, and the rotation adjustment assembly (1000) is used to adjust the degrees of freedom of rotation around the X axis.

2. The five-degree-of-freedom universal flexible rail vehicle for equipment installation according to claim 1 is characterized by: The detachable frame (500) is a stacking type installation frame, and it can be selected whether to install or how many to install according to the needs.

3. The five-degree-of-freedom universal flexible rail vehicle for equipment installation according to claim 1 is characterized by: The device can be installed on the flange at the end of the rotation adjustment component (1000), or on the flat plate of the pallet support seat (800). When the device is installed on the flat plate of the pallet support seat (800), the horizontal adjustment mechanism (900), the rotation adjustment component (1000) and the counterweight component (1100) need to be removed.

4. The five-degree-of-freedom universal flexible rail vehicle for equipment installation according to claim 1 is characterized by: The two-degree-of-freedom component (700) comprises a two-degree-of-freedom component mounting plate (707), a guide rail slider assembly (706) mounted on the two-degree-of-freedom component mounting plate (707), an elevator mounting plate (705) slidably connected to the guide rail slider assembly (706), an elevator (704) mounted on the elevator mounting plate (705), a screw support assembly (702) fixedly connected to the two-degree-of-freedom component mounting plate (707), a screw assembly (703) connected to the screw support assembly (702) and the elevator mounting plate (705) via a screw and a nut, a Y-axis moving hand wheel (701) fixedly connected to the screw assembly (703), and an elevator hand wheel (708) connected to the elevator (704).

5. The five-degree-of-freedom universal flexible rail vehicle for equipment installation according to claim 4 is characterized by: There are two elevators (704), which are connected by an elevator connecting rod (709) and a coupling (710), and can be raised and lowered simultaneously by rotating an elevator hand wheel (708).

6. The five-degree-of-freedom universal flexible rail vehicle for equipment installation according to claim 1 is characterized by: The horizontal adjustment mechanism (900) comprises a lower mounting plate (905) and an upper mounting plate (906); a guide rail slider assembly (904) is installed between the lower mounting plate (905) and the upper mounting plate (906); a lead screw support assembly (902) is fixedly connected to the lower mounting plate (905); the lead screw assembly (903) and the upper mounting plate (906) are connected via a lead screw and a nut; and a rotating hand wheel (901) is fixedly connected to the lead screw assembly (903).

7. The five-degree-of-freedom universal flexible rail vehicle for equipment installation according to claim 1 is characterized by: The rotation adjustment assembly (1000) comprises a mounting plate (1001), a reducer mounting bracket (1002), an intermediate bearing mounting seat assembly (1003), a front end bearing seat mounting assembly (1004), a reducer (1005), an adapter shaft assembly (1006), a bearing 1 (1007), a shaft (1009), a bearing 2 (1010), an end flange (1012), a hand wheel (1014) and a hand wheel mounting shaft (1015). The reducer mounting bracket (1002), the intermediate bearing mounting seat assembly (1003) and the front end bearing seat mounting assembly (1004) are fixedly mounted on the mounting plate (1001). 1001), the reducer (1005) is installed on the reducer mounting bracket (1002), the intermediate bearing mounting seat assembly (1003) and the front end bearing seat mounting assembly (1004) are respectively installed with bearing one (1007) and bearing two (1010), the shaft (1009) is installed in the bearing one (1007) and the bearing two (1010), one end of the shaft is fixedly connected to the reducer (1005) through the adapter shaft assembly (1006), and the other end is fixedly connected to the end flange (1012) of the mounting device, and the handwheel (1014) is connected to the reducer (1005) through the handwheel mounting shaft (1015).

8. The five-degree-of-freedom universal flexible rail vehicle for equipment installation according to claim 1 is characterized by: The assembly (400) is welded into a frame shape by profiles (402), a counterweight mounting rod (407) is welded in the middle, a mounting plate (401) for connecting with the lower frame (300) is welded at one end of the frame, and a lifting rod (404) is welded at the other end, a support foot (403) is installed at the bottom end of the lifting rod (404), and a handle (405) is installed at the top end, and a mounting hole for installing the counterweight is formed on the counterweight mounting rod (407).

9. The five-degree-of-freedom universal flexible rail vehicle for equipment installation according to claim 1 is characterized by: The brake assembly (200) comprises a hand wheel (201), a mounting standard part (202), a clamping screw (203), a mounting bracket (204), a brake plate (205) and a brake rubber (206); the mounting bracket (204) is mounted on the lower frame (300) through the mounting standard part (202); the clamping screw (203) with the hand wheel (201) is threadedly connected to the mounting bracket (204); the brake plate (205) is mounted on the lower end of the clamping screw (203); and the brake rubber (206) is mounted on the brake plate (205).

10. The five-degree-of-freedom universal flexible rail vehicle for equipment installation according to claim 1, characterized in that: the pallet The support seat (800) comprises a profile (801), two two-degree-of-freedom component connection joints and a mounting plate (803); the mounting plate (803) is welded to the profile (801); the two-degree-of-freedom component connection joint is mounted on the mounting plate (803); a round hole or an oblong hole is opened on the two-degree-of-freedom component connection joint; a coordinate system and array holes are arranged on the mounting plate (803) for providing standardized mounting hole positions; and a horizontal adjustment mechanism (900) and a rotation adjustment component (1000) are mounted thereon.

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