CN210859081U

CN210859081U - Quantitative pump

Info

Publication number: CN210859081U
Application number: CN201921562576.1U
Authority: CN
Inventors: 屈钰钦; 付长生
Original assignee: Chongqing Hongguang Mechanical & Electrical Engineering Co ltd
Current assignee: Chongqing Hongguang Electromechanical Equipment Co ltd
Priority date: 2019-09-19
Filing date: 2019-09-19
Publication date: 2020-06-26
Anticipated expiration: 2029-09-19

Abstract

A constant delivery pump comprises a servo driver, a servo motor, a shaft connecting seat, a screw rod, a protective shell, a constant delivery cylinder barrel and a screw rod nut arranged in the protective shell; the servo motor, the shaft connecting seat, the protective shell and the quantitative cylinder barrel are fastened together in sequence; a guide shaft and a lead screw locking nut which is coaxial with the lead screw nut are arranged in the protective shell, one end of the guide shaft is fixed at the bottom in the protective shell, a limiting guide hole which is matched with the guide shaft is arranged on the lead screw locking nut, the lead screw nut is fixedly connected with the lead screw locking nut, and the screw hole corresponds to the lead screw locking nut; one end of the screw rod is movably sleeved with the servo motor in the shaft connecting seat; the screw rod locking nut is fixedly connected with a quantitative shaft in the quantitative cylinder barrel, and an accommodating groove with the cross section diameter larger than that of the screw rod is arranged at one end of the fixed connection of the quantitative shaft and the screw rod locking nut; the bottom in the quantitative cylinder barrel is also provided with an input hole and an output hole; the protective housing is hermetically connected with the shaft connecting seat and the quantitative cylinder barrel. The utility model has the advantages that: the glue can be evenly, equivalently and stably output, and the feeding amount is controlled accurately.

Description

Quantitative pump

Technical Field

The utility model relates to a rubber coating device field, concretely relates to constant delivery pump.

Background

In the production of modern vehicles, the use of various glues, such as structural glues for joining, sealing glues for sealing, and vibration-isolating glues for vibration isolation, is becoming increasingly common. The rubber coating can well reduce the problems of noise, water seepage and the like of the automobile, and the quality of the whole automobile is improved. In the gluing process of the automobile production line, how to ensure that the glue stock is evenly and reasonably coated on the workpiece relates to the quality of the finished automobile product. With the improvement of the future consumption level, the requirement of a consumer on the quality of an automobile is higher, and the automobile body gluing process directly influences the quality of the whole automobile, so that the improvement of the gluing quality and efficiency of the automobile is imperative and vital in a certain time in the future.

At present, the manual gluing speed is low, the glue yield is difficult to realize accurate control, the problems of glue overflow, glue falling, glue breaking, uneven glue spreading and the like often occur, and the waste of auxiliary material cost and personnel working hours is caused. When the edge folding glue is coated, if the defects of waves, different thicknesses and the like appear on the glue line, the problems of rework, even bad edge covering and the like are caused; the adhesive is not uniform, so that the phenomena of insecure adhesion, adhesive pollution and adhesive overflow can occur after adhesion; if glue overflows when welding, before adjusting the line on the car door, the glue needs to be wiped; when glue overflows after the vehicle body is painted, glue shoveling treatment which is difficult to operate is required, and labor and time are wasted; the problem of sealant gluing can also cause the problems of water leakage of the windshield and the like.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a constant delivery pump, its output glue that can be even, equivalent, stable, feed amount control is accurate.

The utility model aims at realizing the quantitative pump by the technical proposal, which comprises a servo driver, a servo motor, a shaft connecting seat, a screw rod, a protective shell, a quantitative cylinder barrel and a screw rod nut arranged in the protective shell; the servo motor, the shaft connecting seat, the protective shell and the quantitative cylinder barrel are fastened together in sequence; a guide shaft and a lead screw locking nut which is coaxial with the lead screw nut are arranged in the protective shell, one end of the guide shaft is fixed at the bottom in the protective shell, a limiting guide hole which is matched with the guide shaft is arranged on the lead screw locking nut, the lead screw nut is fixedly connected with the lead screw locking nut, and the screw hole corresponds to the lead screw locking nut; one end of the screw rod is movably sleeved with the servo motor in the shaft connecting seat; the screw rod locking nut is fixedly connected with a quantitative shaft in the quantitative cylinder barrel, and an accommodating groove with the cross section diameter larger than that of the screw rod is arranged at one end of the fixed connection of the quantitative shaft and the screw rod locking nut; the bottom in the quantitative cylinder barrel is also provided with an input hole and an output hole; the protective housing is hermetically connected with the shaft connecting seat and the quantitative cylinder barrel.

The utility model discloses in, servo driver passes through the power cord and the encoder signal line is connected with servo motor, and servo controller utilizes motor absolute value coding control servo motor to rotate number of turns and angle to guarantee to glue the accuracy of feeding volume control. One end of the screw rod is movably sleeved with the servo motor, so that the screw rod can rotate along with the servo motor. The screw rod nut and the screw rod locking nut are matched with the screw rod, the screw rod nut is fixedly connected with the screw rod locking nut, the screw holes correspond to each other, and the screw rod locking nut is sleeved in a guide shaft fixed at the bottom in the protective shell through a limiting guide hole, so that the screw rod can move up and down while rotating; when the screw rod rotates, the screw rod locking nut limits the screw rod nut to rotate along with the screw rod, and acting force for rotating the screw rod nut is changed into power for driving the screw rod locking nut to move up and down together. Because the quantitative cylinder barrel is internally provided with the quantitative shaft, the screw rod locking nut is fixedly connected with the quantitative shaft in the quantitative cylinder barrel, so that the screw rod locking nut can drive the quantitative shaft to move up and down in the quantitative cylinder barrel; one end of the quantitative shaft fixedly connected with the screw rod locking nut is provided with an accommodating groove with a cross section diameter larger than that of the screw rod, and the accommodating groove can accommodate the screw rod when moving up and down. The bottom in the quantitative cylinder barrel is also provided with an input hole and an output hole which are used for inputting and outputting raw materials; the protective housing is connected with the shaft connecting seat and the quantitative cylinder barrel in a sealing mode, so that the stability of the internal pressure is guaranteed while glue leakage is avoided. The integral structure ensures the accuracy of the control of the uniform, equivalent and stable output glue and feeding amount.

Due to the adoption of the technical scheme, the utility model discloses following advantage has: the glue can be evenly, equivalently and stably output, and the feeding amount is controlled accurately.

Drawings

Fig. 1 is a schematic structural view of a constant delivery pump of the present invention.

Fig. 2 is a schematic structural view of another view angle of the constant delivery pump of the present invention.

Fig. 3 is a schematic cross-sectional view taken along line a-a in fig. 2.

Fig. 4 is another schematic cross-sectional view taken along line a-a in fig. 2.

Fig. 5 is a schematic structural diagram of a second view angle of the constant delivery pump of the present invention.

Fig. 6 is a schematic structural diagram of a third view angle of the constant delivery pump of the present invention.

Fig. 7 is a schematic cross-sectional view taken along line B-B in fig. 6.

Fig. 8 is a schematic diagram of the structure in a in fig. 7.

Fig. 9 is a schematic view of a structure of a bearing pressing end cover.

FIG. 10 is a schematic view of another perspective of the bearing compressing the end cap.

Fig. 11 is a schematic cross-sectional view taken along line C-C of fig. 10.

In the figure: 1. a servo motor; 2. a shaft connecting seat; 3. a screw rod; 4. a protective shell; 5. a quantitative cylinder barrel; 6. a feed screw nut; 7. a guide shaft; 8. a screw rod locking nut; 9. limiting a guide hole; 10. a dosing shaft; 11. accommodating grooves; 12. an input aperture; 13. an output aperture; 14. a speed reducer; 15. a coupling; 16. a clamping table; 17. a card slot; 18. a guide hole; 19. a guide seat; 20. a ring protrusion; 21. a bearing; 22. the bearing compresses the end cover; 23. a double row angular contact ball bearing; 24. a deep groove ball bearing; 25. a stepped bore; 26. a boss; 27. an oil seal liner; 28. locking the nut; 29. flanging; 30. a connecting flange; 31. a connecting rod; 32. an annular groove I; 33. an annular groove II; 34. oiling spacer bushes; 35. the shaft is sealed with a stent; 36. a throat spacer sleeve; 37. plugging and sealing; 38. compressing the flange; 39. an annular projection; 40. mounting holes; 41. an oil filler hole; 42. fastening the screw hole; 43. a through hole; 44. an aviation socket hole; 45. prying a hole; 46. and connecting the holes.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and examples.

As shown in fig. 1 to 8, a fixed displacement pump includes a servo driver, a servo motor 1, a coupling base 2, a screw rod 3, a protective shell 4, a fixed displacement cylinder 5, and a screw rod nut 6 disposed in the protective shell 4; the servo motor 1, the shaft connecting seat 2, the protective shell 4 and the quantitative cylinder barrel 5 are fastened together in sequence; a guide shaft 7 and a lead screw locking nut 8 which is coaxial with the lead screw nut 6 are arranged in the protective shell 4, one end of the guide shaft 7 is fixed at the bottom in the protective shell 4, a limiting guide hole 9 which is matched with the guide shaft 7 is arranged on the lead screw locking nut 8, and the lead screw nut 6 is fixedly connected with the lead screw locking nut 8 and corresponds to the screw hole; one end of a screw rod 3 is movably sleeved with the servo motor 1 in the shaft connecting seat 2; the screw rod locking nut 8 is fixedly connected with a quantitative shaft 10 in the quantitative cylinder barrel 5, and one end of the quantitative shaft 10, which is fixedly connected with the screw rod locking nut 8, is provided with an accommodating groove 11 with the cross section diameter larger than that of the screw rod 3; the bottom in the quantitative cylinder barrel 5 is also provided with an input hole 12 and an output hole 13; the protective shell 4 is hermetically connected with the connecting shaft seat 2 and the quantitative cylinder barrel 5.

The utility model discloses in, servo driver passes through the power cord and is connected with servo motor 1 with encoder signal line, and servo controller utilizes motor absolute value coding control servo motor 1 to rotate number of turns and angle to guarantee to glue the accuracy of feeding volume control. One end of the screw rod 3 is movably sleeved with the servo motor 1, so that the screw rod 3 can rotate along with the servo motor 1. The screw rod nut 6 and the screw rod locking nut 8 are matched with the screw rod 3, the screw rod nut 6 is fixedly connected with the screw rod locking nut 8, screw holes correspond to each other, the screw rod locking nut 8 is sleeved in a guide shaft 7 fixed at the bottom in the protective shell 4 through a limiting guide hole 9, and the screw rod 3 can move up and down while rotating; when the screw rod 3 rotates, the screw rod locking nut 8 limits the screw rod nut 6 to rotate along with the screw rod 3, and the acting force for rotating the screw rod nut 6 is changed into power for driving the screw rod locking nut 8 to move up and down together. Because the screw rod locking nut 8 is fixedly connected with the quantitative shaft 10 in the quantitative cylinder 5, the screw rod locking nut 8 can drive the quantitative shaft 10 to move up and down in the quantitative cylinder 5; one end of the quantitative shaft 10 fixedly connected with the screw rod locking nut 8 is provided with an accommodating groove 11 with a cross section diameter larger than that of the screw rod 3, and the accommodating groove 11 can accommodate the screw rod 3 when moving up and down. The bottom in the quantitative cylinder barrel 5 is also provided with an input hole 12 and an output hole 13 which are communicated with each other in the same way and can be exchanged in position for inputting and outputting raw materials, and the raw materials are connected with an external glue pump for use; the protective housing 4 is hermetically connected with the connecting shaft seat 2 and the quantitative cylinder barrel 5, so that the stability of the internal pressure is ensured while the glue leakage is avoided. The integral structure ensures the accuracy of the control of the uniform, equivalent and stable output glue and feeding amount. Since the main body of this patent protection is the entire fixed displacement pump structure, the specific control system will not be described in detail here.

Further, as shown in fig. 1 to 8, a speed reducer 14 is further fixed between the servo motor 1 and the coupling boss 2, specifically, by screws; the purpose of speed reduction is achieved by engaging a gear with a small number of teeth on the input shaft of the speed reducer 14 with a large gear on the output shaft, and the functions of matching rotating speed and transmitting torque can be achieved.

Further, as shown in fig. 3 and 7, in the coupling base 2, an output end of the servo motor 1 or an output end of the speed reducer 14 is connected with one end of the screw rod 3 through a coupling 15, the coupling 15 is limited in the coupling base 2, and the output end of the servo motor 1 or the output end of the speed reducer 14 drives the screw rod 3 to rotate through the coupling 15. Specifically, the cross section diameter of the upper end of the coupling 15 is matched with the connecting shaft base 2, and the lower end of the coupling is sleeved with the screw rod 3 and is abutted to the clamping table 16 on the screw rod 3.

Further, as shown in fig. 4, in the connecting shaft base 2, the screw rod 3 and the output end of the servo motor 1 or the output end of the speed reducer 14 and the middle part of the end surface of the end connected with the output end of the speed reducer 14 are recessed inwards to form a clamping groove 17, the depth of the clamping groove 17 is smaller than the length of the output end of the servo motor 1 or the output end of the speed reducer, but the clamping groove 17 can still be clamped, preferably, the depth of the clamping groove 17 is larger than or equal to the length of the output end of the servo motor 1 or the output end of the speed reducer 14, and the. The cross section of the clamping groove 17 can be triangular, quadrangular, pentagonal, hexagonal and other polygonal shapes.

Further, as shown in fig. 1 to 8, a guide seat 19 with a guide hole 18 is fixedly connected between the shaft seat 2 and the protective shell 4; in the guide seat 19, a ring bulge 20 is arranged on the screw rod 3, a bearing 21 is arranged at the upper part of the ring bulge 20, and a bearing pressing end cover 22 matched with the guide hole 18 is arranged on the upper end surface of the guide seat 19; the bottom of the shaft connecting seat 2 is fixedly connected with the upper end face of the guide seat 19, and the end cover 22 is tightly pressed by a pressing bearing; the upper part and the lower part of the bearing 21 are provided with sealing elements matched with the rods of the wires 3.

Further, as shown in fig. 3, 4, 7 and 8, the bearing 21 includes two-row angular contact ball bearings 23 and deep groove ball bearings 24, and both are sleeved on the screw rod 3, the number of the two-row angular contact ball bearings 23 is 2 or more, the number of the deep groove ball bearings 24 is 1 or more, and the two-row angular contact ball bearings 23 are disposed at the upper and lower ends of the deep groove ball bearings 24. The double row angular contact ball bearing 23 can bear radial load and axial load acting in two directions, can provide a bearing configuration with higher rigidity, and can bear overturning moment; the deep groove ball bearing 24 has small friction resistance and high rotating speed, and can be used for bearing radial load or radial and axial directions. The two are combined together to assist the screw rod 3 to rotate more lightweight and more accurately.

Further, as shown in fig. 3, 4, 7 and 8 to 11, the outer structure of the bearing pressing end cover 22 is the same as the flange structure, a stepped hole 25 is formed in the inner part of the bearing pressing end cover, and the inner diameter of the large end of the stepped hole 25 is larger than the outer diameter of the boss 26. A sealing structure is arranged on the inner wall of the large end of the stepped hole 25, and a fluorine rubber framework oil seal is preferably used; an oil seal lining 27 positioned at the top of the bearing 21 is arranged between the boss 26 and the screw rod 3, the lower end of the boss 26 is directly abutted against the bearing 21, and the outer side of the boss is matched and fixed with the guide seat 19 through a corresponding step structure.

Further, as shown in fig. 3, 4, 7 and 8, a lock nut 28 is further provided in the coupling seat 2, and the lock nut 28 is preferably an F-shaped flank lock nut, and after being sleeved on the lead screw 3 and pressing the oil seal lining 27, the lock nut 28 and the lead screw 3 are fixed together by using a locking and retaining nut on the lock nut 28. The locking nut 28 can play a better role in sealing and reinforcing the oil seal lining 27 and the bearing 21 while the screw rod 3 rotates.

Further, as shown in fig. 3, 4, 7 and 8, a sealing structure is also provided between the ring protrusion 20 and the lower end of the bearing 21, preferably a fluorine rubber skeleton oil seal is used; an oil seal lining is arranged between the sealing structure and the screw rod 3; and the double-layer seal is used, so that good seal for oil is ensured.

Further, as shown in fig. 1 to 8, a flange 29 is arranged on the guide seat 19, the protective shell 4 and the quantitative cylinder 5 are connected through a connecting flange 30, and the flange 29 and the connecting flange 30 are fastened together through a connecting rod 31; the tightness of the connection of the whole structure is ensured.

Further, as shown in fig. 3, 4 and 7, the inner walls of the upper and lower portions of the connecting flange 30 are provided with an annular groove i 32 and an annular groove ii 33, an oil filling spacer 34 and a shaft steckel seal 35 are provided in the annular groove i 32 from top to bottom, and a throat spacer 36 and a flooding plug seal 37 are provided in the annular groove ii 33 from top to bottom. The annular groove II 33 is in a step shape, the throat spacer bush 34 is matched with the annular groove II in shape, and a flooding plug seal 37 is arranged on the lower step. The oil filling spacer 34 and the shaft steckel seal 35, the throat spacer 36 and the universal plug seal 37 in the annular groove I32 ensure the mutual tightness of oil and glue on the upper side and the lower side of the connecting flange 30.

Further, as shown in fig. 3, 4 and 7, the upper end face of the connecting flange 30 is provided with a pressing flange 38, and the lower part of the pressing flange 38 is provided with an annular protrusion 39 matched with the annular groove i 32; the guide shaft 7 is fixed to the connecting flange through the hold-down flange 38. The annular bulge 39 on the pressing flange 38 has a pressing effect on the oil injection spacer 34 and the shaft steckel seal 35, and the sealing performance of the structure is further ensured.

Further, as shown in fig. 2, 3, 4 and 7, the shape of the connection part of the guide holder 19 and the protective case 4 is matched with that of the lead screw nut 6, mounting holes 40 of the proximity switches are provided in the upper part and the lower part of the protective case 4, the mounting hole 40 of the upper part is provided at a position corresponding to the uppermost part of the lead screw nut 6, and the mounting hole 40 of the lower part is provided at the lowermost position of the lead screw lock nut 8 fastened with the lead screw nut 6 in the protective case 4. The proximity switch can more accurately control and identify the position of the screw nut 6 or the screw locking nut 8 so as to avoid the occurrence of damage caused by the fact that the servo motor 1 still rotates under the condition that the limit position is reached.

Further, as shown in fig. 1, 3, 4, 5, 7 and 8, oil holes 41 are provided on both the guide seat 19 and the attachment flange 30. The oil injection hole 41 on the guide seat 19 is arranged at a position corresponding to the uppermost part of the screw nut 6; oil injection holes 41 in the attachment flange 30 are provided in the upper portion of the pressing flange 38. The oil injection holes 41 are used for injecting lubricating oil, so that the screw rod locking nut 8 can slide up and down more smoothly on the guide shaft 7.

Further, as shown in fig. 1, 6 and 7, the bottom of the dosing cylinder 5 is provided with an air socket hole 44 communicating with the inside of the dosing cylinder 5. Aviation socket hole 44 is used for installing aviation socket, and aviation socket is used for installing heating tube and thermal sensor, still is equipped with on 5 walls of ration cylinder section of thick bamboo and is used for fixed inside heating tube and thermal sensor's tight set screw hole 42.

Further, as shown in fig. 3, 4, 7 and 8, the bottom of the lead screw nut 6 is provided with a through hole 43, when the lead screw locking nut 8 reaches a higher position for filling lubricating oil, the lubricating oil can be ensured to naturally enter the protective shell 4 through the through hole 43, and in addition, the through hole 43 also plays a role of reducing weight, so that the load of the servo motor 1 is reduced, and the energy is saved.

Further, as shown in fig. 3, 4, 7, and 8, the feed screw nut 6 and the feed screw lock nut 8 are fixed by a screw or a bolt. The connecting hole 46 is internally provided with an internal thread, the end part of the quantitative shaft 7 is provided with an external thread matched with the internal thread, and the internal thread is connected with the external thread to ensure that the screw rod locking nut 8 is fixedly connected with the quantitative shaft 10 in the quantitative cylinder barrel 5.

Further, as shown in fig. 6, a prying hole 45 is formed at a connection part of the quantitative cylinder 5 and the connecting flange 30. The prying hole 45 is a position for prying by using a prying bar, so that the quantitative cylinder barrel 5 can be more conveniently disassembled.

Further, the input aperture 12 and the output aperture 13 are identical and can be transposed with respect to each other. The heating tube is used for heating glue, and the heating tube effect lies in keeping equipment temperature and keeps invariable, guarantees out that the volume of gluing does not receive expend with heat and contract with cold and influence to prevent to glue excessively to glue and block up input and output, and heat-sensitive sensor converts the temperature into the conversion device of the signal of telecommunication, and it is connected with the servo controller electricity.

Claims

1. A constant delivery pump is characterized by comprising a servo driver, a servo motor (1), a connecting shaft seat (2), a screw rod (3), a protective shell (4), a constant delivery cylinder barrel (5) and a screw rod nut (6) arranged in the protective shell (4); the servo motor (1), the connecting shaft seat (2), the protective shell (4) and the quantitative cylinder barrel (5) are fastened together in sequence; a guide shaft (7) and a lead screw locking nut (8) which is coaxial with the lead screw nut (6) are arranged in the protective shell (4), one end of the guide shaft (7) is fixed at the bottom in the protective shell (4), a limiting guide hole (9) matched with the guide shaft (7) is arranged on the lead screw locking nut (8), and the lead screw nut (6) is fixedly connected with the lead screw locking nut (8) and corresponds to the screw hole; one end of the screw rod (3) is movably sleeved with the servo motor (1) in the shaft connecting seat (2); the screw rod locking nut (8) is fixedly connected with a quantitative shaft (10) in the quantitative cylinder barrel (5), and one end of the quantitative shaft (10) fixedly connected with the screw rod locking nut (8) is provided with an accommodating groove (11) with the cross section diameter larger than that of the screw rod (3); the inner bottom of the quantitative cylinder barrel (5) is also provided with an input hole (12) and an output hole (13); the protective shell (4) is hermetically connected with the shaft connecting seat (2) and the quantitative cylinder barrel (5).

2. Dosing pump according to claim 1, characterized in that a guide seat (19) with a guide hole (18) is further fastened between the shaft seat (2) and the protective casing (4); in the guide seat (19), a ring bulge (20) is arranged on the screw rod (3), a bearing (21) is arranged at the upper part of the ring bulge (20), and a bearing pressing end cover (22) matched with the guide hole (18) is arranged on the upper end surface of the guide seat (19); the bottom of the shaft connecting seat (2) is fixedly connected with the upper end face of the guide seat (19), and the end cover (22) is tightly pressed by a pressing bearing; the upper part and the lower part of the bearing (21) are provided with sealing elements matched with the screw rod (3).

3. Dosing pump according to claim 2, characterized in that the guide (19) is provided with a flange (29), the protective casing (4) and the dosing cylinder (5) are connected by a connecting flange (30), and the flange (29) and the connecting flange (30) are fastened together by a connecting rod (31).

4. Dosing pump according to claim 3, characterized in that the inner walls of the upper and lower parts of the coupling flange (30) are provided with an annular groove I (32) and an annular groove II (33), that the annular groove I (32) is provided with a grease filling spacer (34) and a shaft Stent seal (35) from top to bottom, and that the annular groove II (33) is provided with a throat spacer (36) and a flooding plug seal (37) from top to bottom.

5. Dosing pump according to claim 4, characterized in that the upper end face of the connecting flange (30) is provided with a pressing flange (38), and the lower part of the pressing flange (38) is provided with an annular protrusion (39) matching with the annular groove I (32); the guide shaft (7) passes through the pressing flange (38) and is fixed on the connecting flange.

6. Dosing pump according to one of claims 1 to 5, characterised in that the connection of the guide (19) to the protective housing (4) is shaped to match the spindle nut (6), and that the protective housing (4) is provided with mounting holes (40) for the proximity switches in the upper and lower parts.

7. Dosing pump according to one of claims 1 to 5, characterized in that the guide (19) and the connecting flange (30) are provided with oil holes (41).

8. Dosing pump according to claim 6, characterized in that the guide seat (19) and the connecting flange (30) are provided with oil holes (41).

9. Dosing pump according to claim 1, 2, 3, 4, 5 or 8, characterized in that the dosing cylinder (5) is provided at its bottom with an air-socket hole (44) communicating with the inside of the dosing cylinder (5).

10. Dosing pump according to claim 6, characterized in that the dosing cylinder (5) is provided at its bottom with an air-socket hole (44) communicating with the inside of the dosing cylinder (5).