An apparatus for automatic cleaning and glue pushing of a BMS product assembly

Abstract

The application discloses a kind of BMS product assembly's automatic cleaning and push glue device, it is related to BMS dispensing technical field;To solve the problem of cleaning;Specifically including mounting seat, the middle part of the mounting seat is provided with A / B glue storage glue feeding mechanism, the bottom of mounting seat is provided with cleaning dispensing mechanism, the inner wall of mounting seat is rotatably connected with two lead screws above A / B glue storage glue feeding mechanism, the outer wall of each lead screw is connected with push table by thread, push table is slidably connected to the inner wall of mounting seat, and the top of mounting seat is provided with the driving part for driving lead screw.This application can clean the area to be dispensed by setting the wiping head, thereby ensuring the dispensing effect, on the other hand, the wiping head and the dispensing head are arranged integrally, which simplifies the process station and the arrangement of cleaning equipment, and the rotation of the rotating frame can switch the station of the wiping head and the dispensing head, and the dispensing head can dispense vertically or obliquely when dispensing, which increases the flexibility of dispensing angle.

Description

TECHNICAL FIELD

[0001] The present application relates to the BMS dispensing technology field, especially to a kind of automatic cleaning and push glue device of BMS product assembly. BACKGROUND

[0002] BMS product assembly refers to the entire process of assembling various electronic components, structural parts, connectors and the like into a complete, normally operating battery management system (BMS) module or printed circuit board (PCBA).

[0003] This process usually includes SMT patch, wave soldering / reflow soldering, THT plug-in, three-proof paint coating, glue filling / dispensing, shell assembly, testing, wherein the dispensing process is dispensing some areas or elements for dispensing, heat dissipation or sealing.

[0004] The traditional glue pushing machine does not have cleaning effect, and if dispensing is not cleaned, it will have the disadvantages of insufficient adhesive force and decreased element insulation performance.

[0005] If another cleaning process is provided, it will cause process complexity, multiple equipment use and other defects.

[0006] Therefore, the present application provides an automatic cleaning and glue pushing device for BMS product assembly. SUMMARY

[0007] The purpose of the present application is to solve the shortcomings in the prior art and provide an automatic cleaning and glue pushing device for BMS product assembly.

[0008] To achieve the above purpose, the present application adopts the following technical solutions:

[0009] An automatic cleaning and glue pushing device for BMS product assembly, comprising a mounting seat, an A / B glue storage dispensing mechanism is arranged in the middle of the mounting seat, a cleaning and dispensing mechanism is arranged at the bottom of the mounting seat, two lead screws are rotatably connected to the inner wall of the mounting seat above the A / B glue storage dispensing mechanism, a pushing table is threadedly connected to the outer wall of each lead screw, the pushing table is slidingly connected to the inner wall of the mounting seat, and a driving portion is arranged at the top of the mounting seat to drive the lead screws;

[0010] The A / B glue storage dispensing mechanism comprises two glue storage boxes storing the same or different types of glue and a piston slidingly connected to the inner wall of the glue storage box, the top of the piston is connected to the pushing table by a push rod, and the bottoms of the two glue storage boxes are communicated and fixed with a multi-way glue mixing pipe;

[0011] The cleaning dispensing mechanism comprises a wiping head, a rotating frame and a dispensing head, the rotating frame is rotationally connected to the inner side of the mounting seat, a stop valve is fixed to the inner side of the rotating frame, the top of the stop valve is connected to the multi-way glue mixing pipe through a connecting hose, the dispensing head is fixed to the bottom of the rotating frame, and the wiping head is arranged on the outer wall of the rotating frame.

[0012] Preferably, an extension device is fixed to the inner side wall of the mounting seat, and the extension end of the extension device is rotationally connected to a connecting rod, and the other end of the connecting rod is rotationally connected to the side wall of the rotating frame.

[0013] Further, the wiping head is movably inserted into the inner wall of one side of the rotating frame, the side wall of the mounting seat is provided with a cam groove, and one side of the wiping head is movably limited and matched to the inner wall of the cam groove through a limiting column.

[0014] Based on the foregoing scheme, the cam groove is composed of two semicircular arcs and a straight groove connecting the two semicircular arcs and being tangent to the two semicircular arcs.

[0015] In the foregoing scheme, a better scheme is that a protective shell is fixed to the outer wall of the mounting seat at the A / B glue storage and glue feeding mechanism, the inner wall of the protective shell is respectively provided with a temperature insulation cavity and a containing cavity, the containing cavity is located on the inner side of the temperature insulation cavity, and the inner wall of the containing cavity is fixed with an electric heating wire.

[0016] As a further scheme of the present application, the driving part comprises an electric motor, two sets of elastic variable-diameter wheels and two sets of fixed-diameter pulleys, the two sets of fixed-diameter pulleys are respectively fixed to the outer walls of the two lead screws, the two sets of elastic variable-diameter wheels are coaxially fixedly connected through a main shaft, and the two sets of elastic variable-diameter wheels and the fixed-diameter pulleys are respectively matched through a synchronous belt transmission.

[0017] Meanwhile, the two ends of the main shaft are rotationally connected with sliding blocks, the sliding blocks are slidingly connected to the inner wall of the mounting seat, the electric motor is fixed to the outer wall of one of the sliding blocks through bolts, and the output shaft of the electric motor is fixedly connected to one end of the main shaft.

[0018] As a preferred scheme of the present application, the outer wall of one side of the mounting seat is fixed with an extension device two through bolts, and the extension end of the extension device two is fixed to the side wall of the sliding block through bolts.

[0019] Meanwhile, the elastic variable-diameter wheel comprises a base wheel and a plurality of support sliding columns which are slidingly connected to the side wall of the base wheel, the outer side of the support sliding column is fixed with an arc-shaped pulley piece, and the other side of the support sliding column is connected to the inner wall of the base wheel through an elastic body.

[0020] As a more preferred scheme of the present application, one side of the base wheel is rotationally connected with a synchronous disc, the side wall of the support sliding column is fixed with a limiting rod, and the inner wall of the synchronous disc is provided with a plurality of inclined sliding grooves which are movably limited and matched with the limiting rod.

[0021] The present application has the following advantages:

[0022] 1. The present application, on the one hand, by setting the wiping head, which can clean the area to be glued, so as to ensure the effect of glue dispensing, on the other hand, the wiping head and glue dispensing head are arranged integrally, which simplifies the process station and cleaning equipment arrangement, and at the same time, the rotation of the rotating frame can switch the station of the wiping head and the glue dispensing head, and can also make the glue dispensing head vertical or inclined when dispensing glue, increasing the flexibility of the dispensing angle.

[0023] 2. The present application, by setting the wiping head and the rotating frame as movable plug-in, and additionally setting the cam groove and the limiting column, so that the wiping head can be stretched outward when rotating to the bottom wiping station, and can be retracted inward when being in the non-working station, which can prevent the wiping head in the dispensing state from interfering with other components, and increase the reliability.

[0024] 3. The present application, by setting the protective shell, which can maintain the temperature of the glue by using the heating function of the electric heating wire in a low temperature environment, so as to ensure that the glue has good fluidity, thereby ensuring the reliability of the glue pushing and dispensing, and additionally setting the temperature insulation cavity, which can prevent the heat of the electric heating wire from leaking, and has a certain energy saving effect.

[0025] 4. The present application, by using two groups of elastic variable diameter wheels, synchronous belts and fixed diameter pulleys to drive connect two lead screws to the same motor, and then changing the transmission ratio of the two groups of elastic variable diameter wheels, synchronous belts and fixed diameter pulleys through the sliding block, so as to change the speed ratio of the two lead screws, and realize the stepless adjustment of the ratio of different glues in the two glue storage boxes.

[0026] 5. The present application, by setting the elastic variable diameter wheel, which can be self-tensioned while meeting the variable diameter, so as to realize the automatic and reliable variable diameter process, and by setting the synchronous disc, which uses the limiting rod and the inclined sliding groove to synchronously cooperate with multiple arc-shaped pulley pieces, so as to ensure that the multiple arc-shaped pulley pieces are in the same transmission radius state, and ensure the transmission accuracy. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 The overall structure schematic diagram of the automatic cleaning and glue pushing device for BMS product assembly is proposed in the present application;

[0028] Figure 2 The cleaning and glue dispensing mechanism structure schematic diagram of the automatic cleaning and glue pushing device for BMS product assembly is proposed in the present application;

[0029] Figure 3 The wiping head and rotating frame cooperation structure schematic diagram of the automatic cleaning and glue pushing device for BMS product assembly is proposed in the present application;

[0030] Figure 4A / B glue storage and feeding mechanism structure schematic view of the automatic cleaning and glue pushing device for BMS product assembly provided by the present application;

[0031] Figure 5 Protective shell position structure schematic view of the automatic cleaning and glue pushing device for BMS product assembly provided by the present application;

[0032] Figure 6 Protective shell cross-sectional structure schematic view of the automatic cleaning and glue pushing device for BMS product assembly provided by the present application;

[0033] Figure 7 Drive part structure schematic view of the automatic cleaning and glue pushing device for BMS product assembly provided by the present application;

[0034] Figure 8 Extender two position structure schematic view of the automatic cleaning and glue pushing device for BMS product assembly provided by the present application;

[0035] Figure 9 Elastic variable-diameter wheel structure schematic view of the automatic cleaning and glue pushing device for BMS product assembly provided by the present application;

[0036] Figure 10 Elastic variable-diameter wheel cross-sectional structure schematic view of the automatic cleaning and glue pushing device for BMS product assembly provided by the present application.

[0037] In the figure: 1, mounting seat; 2, pushing table; 3, screw rod; 4, drive part; 5, A / B glue storage and feeding mechanism; 6, cleaning and glue dispensing mechanism; 7, connecting hose; 8, wiping head; 9, stop valve; 10, rotating frame; 11, glue dispensing head; 12, connecting rod; 13, extender one; 14, multi-way glue mixing pipe; 15, cam groove; 16, limiting column; 17, pushing rod; 18, glue storage box; 19, piston; 20, protective shell; 21, temperature insulation cavity; 22, containing cavity; 23, electric heating wire; 24, main shaft; 25, sliding block; 26, electric motor; 27, elastic variable-diameter wheel; 28, synchronous belt; 29, elastic body; 30, constant-diameter pulley; 31, base wheel; 32, extender two; 33, supporting sliding column; 34, arc-shaped pulley piece; 35, limiting rod; 36, inclined sliding groove; 37, synchronous disc. DETAILED DESCRIPTION

[0038] The technical solutions of the present application will be further described in detail below in combination with specific embodiments.

[0039] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0040] Example 1: An automatic cleaning and adhesive dispensing device for BMS product assembly, such as... Figures 1-10 As shown, the device includes a mounting base 1, which can be fixed or slidably mounted using a three-axis (x, y, z) sliding table. An A / B glue storage and dispensing mechanism 5 is located in the middle of the mounting base 1, and a cleaning and dispensing mechanism 6 is located at the bottom of the mounting base 1. Two lead screws 3 are rotatably connected to the inner wall of the mounting base 1 above the A / B glue storage and dispensing mechanism 5. A pusher 2 is threadedly connected to the outer wall of each lead screw 3, and the pusher 2 is slidably connected to the inner wall of the mounting base 1. A drive unit 4 for driving the lead screws 3 is located at the top of the mounting base 1.

[0041] The A / B glue storage and dispensing mechanism 5 includes two glue storage boxes 18 that store the same or different types of glue, and a piston 19 that is slidably connected to the inner wall of the glue storage box 18. The top of the piston 19 is connected to the push table 2 through a push rod 17. The bottoms of the two glue storage boxes 18 are connected and fixed with the same multi-port mixing tube 14.

[0042] The cleaning and dispensing mechanism 6 includes a wiping head 8, a rotating frame 10, and a dispensing head 11. The rotating frame 10 is rotatably connected to the inner side of the mounting base 1. A shut-off valve 9 is fixed to the inner side of the rotating frame 10. The top of the shut-off valve 9 is connected to the multi-port mixing tube 14 through a connecting hose 7. The dispensing head 11 is fixed to the bottom of the rotating frame 10, and the wiping head 8 is disposed on the outer wall of the rotating frame 10.

[0043] When this device is in use, the drive unit 4 can drive the lead screw 3 to rotate. The lead screw 3 uses the threaded connection to drive the push table 2 to descend. The push table 2 drives the piston 19 to descend through the push rod 17. At this time, the shut-off valve 9 is in the open state. The glue in the glue storage box 18 is squeezed by the piston 19 and sprayed out after passing through the multi-port mixing tube 14, the connecting hose 7, the shut-off valve 9, and the dispensing head 11 in sequence. At the same time, before dispensing, the wiping head 8 can be positioned at the bottom and oscillated back and forth by rotating the rotating frame 10 to clean the area to be dispensed.

[0044] This device, on the one hand, cleans the area to be dispensed by wiping head 8, thereby ensuring the dispensing effect. On the other hand, the wiping head 8 and the dispensing head 11 are integrated, simplifying the arrangement of the process station and cleaning equipment. At the same time, the rotation of the rotating frame 10 can not only switch the station of wiping head 8 and dispensing head 11, but also allow dispensing head 11 to dispense glue vertically or at an angle, increasing the flexibility of the dispensing angle.

[0045] The inner side wall of the mounting base 1 is fixed with a telescopic device 13, the telescopic end of which is rotatably connected with a connecting rod 12, the other end of the connecting rod 12 being rotatably connected with the side wall of the rotating frame 10; when the telescopic device 13 is telescoped, it can drive the rotating frame 10 to rotate through the connecting rod 12, thereby driving the wiping head 8 and the glue dispensing head 11 to switch workstations and the wiping head 8 to reciprocally swing to clean the wiping station.

[0046] As shown in Figure 3 , the wiping head 8 is movably inserted into the inner wall of one side of the rotating frame 10, the side wall of the mounting base 1 is provided with a cam groove 15, and one side of the wiping head 8 is movably limited and fitted to the inner wall of the cam groove 15 through a limiting column 16.

[0047] The cam groove 15 is composed of two semicircular arcs and a straight groove connecting and tangent to the two semicircular arcs.

[0048] The device, by movably inserting the wiping head 8 and the rotating frame 10 and additionally providing the cam groove 15 and the limiting column 16, can make the wiping head 8 outwardly extend when rotating to the bottom wiping station and inwardly retract when being in the non-working station, thereby preventing the wiping head 8 in the glue dispensing state from interfering with other components and increasing reliability.

[0049] In order to solve the problem of fluidity; as shown in Figure 5 , 6 , the outer wall of the mounting base 1 at the A / B glue storage and glue feeding mechanism 5 is fixed with a protective shell 20, the inner wall of the protective shell 20 is provided with a temperature insulation cavity 21 and a containing cavity 22, the containing cavity 22 is located on the inner side of the temperature insulation cavity 21, and the inner wall of the containing cavity 22 is fixed with an electric heating wire 23.

[0050] Since the fluidity of the glue is positively correlated with the temperature of the glue within a reliable temperature range, the device can maintain the temperature of the glue by using the heating function of the electric heating wire 23 in a low temperature environment, so as to ensure that the glue has good fluidity and thereby ensure the reliability of the glue pushing and dispensing, and additionally, the temperature insulation cavity 21 can prevent the heat of the electric heating wire 23 from being discharged, thereby achieving a certain energy-saving effect.

[0051] In this embodiment, the drive unit 4 can drive the lead screw 3 to rotate. The lead screw 3 uses the threaded connection to drive the push table 2 to descend. The push table 2 drives the piston 19 to descend through the push rod 17. At this time, the shut-off valve 9 is in the open state. The glue in the glue storage box 18 is squeezed by the piston 19 and sprayed out after passing through the multi-port mixing tube 14, the connecting hose 7, the shut-off valve 9, and the dispensing head 11 in sequence. At the same time, before dispensing, the wiping head 8 can be positioned at the bottom and reciprocated by rotating the rotating frame 10 to clean the area to be dispensed. In addition, when the telescopic device 13 extends and retracts, it can drive the rotating frame 10 to rotate through the connecting rod 12, thereby driving the wiping head 8 to switch positions with the dispensing head 11 and the wiping head 8 to reciprocate and clean the wiping position.

[0052] Example 2: An automatic cleaning and adhesive dispensing device for BMS product assembly, such as... Figures 1-10 As shown, in order to solve the problem of adjusting the mixing ratio of different adhesives, this embodiment makes the following improvements based on embodiment 1: The drive unit 4 includes a motor 26, two sets of elastic variable diameter pulleys 27 and two sets of sizing pulleys 30. The two sets of sizing pulleys 30 are respectively fixed to the outer walls of the two lead screws 3. The two sets of elastic variable diameter pulleys 27 are coaxially fixedly connected through the main shaft 24. The two sets of elastic variable diameter pulleys 27 and the sizing pulleys 30 are respectively driven by a synchronous belt 28.

[0053] Both ends of the main shaft 24 are rotatably connected to sliders 25, which are slidably connected to the inner wall of the mounting base 1. The motor 26 is fixed to the outer wall of one of the sliders 25 by bolts, and the output shaft of the motor 26 is fixedly connected to one end of the main shaft 24.

[0054] One side of the outer wall of the mounting base 1 is fixed with a second expansion joint 32 by bolts, and the telescopic end of the second expansion joint 32 is fixed to the side wall of the slider 25 by bolts.

[0055] When the motor 26 starts, it drives the two flexible variable diameter pulleys 27 to rotate through the main shaft 24, which in turn drives the sizing pulley 30 to rotate through the synchronous belt 28, causing the lead screw 3 to rotate. When the expansion joint 32 extends or retracts, it drives the slider 25 to slide, thereby changing the position of the flexible variable diameter pulleys 27. This results in a smaller distance between one set of flexible variable diameter pulleys 27 and the sizing pulley 30, reducing their transmission ratio, while the distance between the other set of flexible variable diameter pulleys 27 and the sizing pulley 30 increases, increasing their transmission ratio. This adjusts the speed ratio of the two lead screws 3.

[0056] This device connects two lead screws 3 to the same motor 26 via two sets of elastic variable diameter pulleys 27, synchronous belts 28, and fixed diameter pulleys 30. The transmission ratio of the two sets of elastic variable diameter pulleys 27, synchronous belts 28, and fixed diameter pulleys 30 is changed by sliding the slider 25, thereby changing the speed ratio of the two lead screws 3. This allows for stepless adjustment of the glue ratio when using different glues in the two glue storage boxes 18.

[0057] The elastic variable-diameter wheel 27 comprises a base wheel 31 and a plurality of supporting slide columns 33 radially slidingly connected to the side wall of the base wheel 31, the outer side of the supporting slide columns 33 is fixed with arc-shaped belt wheel pieces 34, and the other side of the supporting slide columns 33 is connected to the inner wall of the base wheel 31 through the elastic body 29.

[0058] One side of the base wheel 31 is rotationally connected with a synchronous disc 37, the side wall of the supporting slide columns 33 is fixed with a limiting rod 35, and the inner wall of the synchronous disc 37 is provided with a plurality of inclined slide grooves 36 movably limiting matched with the limiting rod 35.

[0059] The elastic body 29 will exert an elastic force to the supporting slide columns 33 to the outer side, so that the arc-shaped belt wheel pieces 34, the synchronous belt 28 and the diameter fixing belt wheel 30 are always in a tension state, but when the center distance between the arc-shaped belt wheel pieces 34 and the diameter fixing belt wheel 30 changes, the arc-shaped belt wheel pieces 34 will be expanded outwardly or contracted inwardly by the elastic force of the elastic body 29, so as to realize the change of transmission variable-diameter.

[0060] The device is provided with the elastic variable-diameter wheel 27, which can be self-tensioned while meeting the variable-diameter, so as to realize the automatic and reliable variable-diameter process, and the synchronous disc 37 is provided, which utilizes the limiting rod 35 and the inclined slide groove 36 to synchronously match the plurality of arc-shaped belt wheel pieces 34, so as to ensure that the plurality of arc-shaped belt wheel pieces 34 are in the same transmission radius state and ensure the transmission precision.

[0061] The above is only the preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this, any skilled person in the art can make equivalent replacement or change according to the technical solution and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. An automatic cleaning and adhesive dispensing device for BMS product assembly, comprising a mounting base (1), characterized in that, The mounting base (1) is provided with an A / B glue storage and dispensing mechanism (5) in the middle and a cleaning and dispensing mechanism (6) at the bottom. The inner wall of the mounting base (1) above the A / B glue storage and dispensing mechanism (5) is rotatably connected to two screws (3). The outer wall of each screw (3) is connected to a pusher (2) by a thread. The pusher (2) is slidably connected to the inner wall of the mounting base (1). The top of the mounting base (1) is provided with a drive unit (4) for driving the screws (3). The A / B glue storage and dispensing mechanism (5) includes two glue storage boxes (18) for storing the same or different types of glue and a piston (19) slidably connected to the inner wall of the glue storage box (18). The top of the piston (19) is connected to the push table (2) through a push rod (17). The bottoms of the two glue storage boxes (18) are connected and fixed with the same multi-port mixing tube (14). The cleaning dispensing mechanism (6) includes a wiping head (8), a rotating frame (10), and a dispensing head (11). The rotating frame (10) is rotatably connected to the inner side of the mounting base (1). A shut-off valve (9) is fixed on the inner side of the rotating frame (10). The top of the shut-off valve (9) is connected to the multi-port mixing tube (14) through a connecting hose (7). The dispensing head (11) is fixed to the bottom of the rotating frame (10), and the wiping head (8) is located on the outer wall of the rotating frame (10). The inner wall of the mounting base (1) is fixed with an expansion joint (13), and the telescopic end of the expansion joint (13) is rotatably connected to a connecting rod (12), and the other end of the connecting rod (12) is rotatably connected to the side wall of the rotating frame (10). The wiping head (8) is movably inserted into the inner wall of one side of the rotating frame (10). The side wall of the mounting base (1) is provided with a cam groove (15). One side of the wiping head (8) is movably limited and matched with the inner wall of the cam groove (15) by a limiting post (16). By setting up a wiping head (8), it can clean the area where adhesive is applied; The drive unit (4) includes a motor (26), two sets of flexible variable diameter pulleys (27) and two sets of fixed diameter pulleys (30). The two sets of fixed diameter pulleys (30) are respectively fixed to the outer walls of the two lead screws (3). The two sets of flexible variable diameter pulleys (27) are coaxially fixedly connected through the main shaft (24). The two sets of flexible variable diameter pulleys (27) and the fixed diameter pulleys (30) are respectively driven by a synchronous belt (28). The elastic variable diameter wheel (27) includes a base wheel (31) and a plurality of support slides (33) that are radially slidably connected to the side wall of the base wheel (31). An arc-shaped pulley piece (34) is fixed on the outer side of the support slide (33), and the other side of the support slide (33) is connected to the inner wall of the base wheel (31) through an elastic body (29). The base wheel (31) is rotatably connected to a timing disc (37), and a limit rod (35) is fixed to the side wall of the supporting slide column (33). The inner wall of the timing disc (37) is provided with multiple inclined grooves (36) that are movable and limited by the limit rod (35).

2. The automatic cleaning and adhesive application device for BMS product assembly according to claim 1, characterized in that, The cam groove (15) consists of two semicircular arcs and a straight groove that connects the two semicircular arcs and is tangent to them.

3. The automatic cleaning and adhesive dispensing device for BMS product assembly according to claim 1, characterized in that, The mounting base (1) is fixed with a protective shell (20) on the outer wall of the A / B glue storage and dispensing mechanism (5). The inner wall of the protective shell (20) is provided with a heat insulation cavity (21) and a receiving cavity (22). The receiving cavity (22) is located inside the heat insulation cavity (21), and an electric heating wire (23) is fixed on the inner wall of the receiving cavity (22).

4. The automatic cleaning and adhesive dispensing device for BMS product assembly according to claim 1, characterized in that, Both ends of the main shaft (24) are rotatably connected to sliders (25). The sliders (25) are slidably connected to the inner wall of the mounting base (1). The motor (26) is fixed to the outer wall of one of the sliders (25) by bolts, and the output shaft of the motor (26) is fixedly connected to one end of the main shaft (24).

5. The automatic cleaning and adhesive dispensing device for BMS product assembly according to claim 4, characterized in that, One side of the mounting base (1) is fixed with a second expansion joint (32) by bolts, and the telescopic end of the second expansion joint (32) is fixed to the side wall of the slider (25) by bolts.

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