CN215753214U

CN215753214U - Egg or egg-shaped feeding equipment for packaging machine

Info

Publication number: CN215753214U
Application number: CN202122254841.3U
Authority: CN
Inventors: 康定栋
Original assignee: Shanghai Ningzhe Machinery Technology Co ltd
Current assignee: Shanghai Ningzhe Machinery Technology Co ltd
Priority date: 2021-09-16
Filing date: 2021-09-16
Publication date: 2022-02-08
Anticipated expiration: 2031-09-16

Abstract

The application discloses material equipment is thrown to eggs or egg form that packagine machine used, include the backup pad and throw the material structure, backup pad bottom rigid coupling slip wheelset, it includes the support column to throw the material structure, the support column rigid coupling is in the backup pad top, the first mounting panel of support column top rigid coupling, first mounting panel one side is provided with first conveying assembly, first mounting panel top rigid coupling storage silo, storage silo inner chamber lateral wall rigid coupling deflector, first mounting panel bottom rigid coupling second mounting panel, second mounting panel one side is provided with second conveying assembly, second mounting panel top is provided with blocks the subassembly. This application can be convenient for convey egg or egg form product through first conveying subassembly and second conveying subassembly isotructure, is convenient for throw the material to packagine machine, and can prevent through second baffle and division board that egg or egg form product are in disorder, gather together, improves the efficiency of throwing the material and the efficiency of packagine machine packing.

Description

Egg or egg-shaped feeding equipment for packaging machine

Technical Field

The application relates to the field of packaging, in particular to an egg or egg-shaped feeding device for a packaging machine.

Background

The packaging machine is a machine for packaging products, plays a role in protection and attractiveness, is used for production line type integral production and packaging, is applied to filling (filling), sealing machine and code printing of (bagged and bottled) products in the industries of food, medicine, daily chemicals, hardware, lamp decoration, furniture and the like, and has various types and classification methods. From different viewpoints, there are many, and the mechanical categories are: liquid packaging machine, powder packaging machine, granule packaging machine, skin packaging machine, sauce packaging machine, electronic combination scale packaging machine, pillow type packaging machine; according to the packaging function, an inner packaging machine and an outer packaging machine are provided; according to the packaging industry, the packaging machine comprises a packaging machine for food, daily chemical industry, textile and the like; according to the packaging stations, the packaging machine is divided into a single-station packaging machine and a multi-station packaging machine; according to the automatic degree, there are semi-automatic and full-automatic packing machines.

At present, the feeding efficiency is low when eggs or egg-shaped products are packaged, and the eggs or the egg-shaped products are easy to scatter and gather together when being conveyed, so that the packaging efficiency of the eggs or the egg-shaped products is low. Therefore, an egg or egg-shaped feeding device for a packaging machine is provided for solving the problems.

Disclosure of Invention

The embodiment provides an egg or egg-shaped feeding device for a packaging machine, which is used for solving the problems that in the prior art, the feeding efficiency is low when eggs or egg-shaped products are packaged, and the eggs or egg-shaped products are easily scattered and gathered together during conveying, so that the packaging efficiency of the eggs or egg-shaped products is low.

According to an aspect of the application, an egg or egg that packagine machine used throws material equipment is provided, include the backup pad and throw the material structure, backup pad bottom rigid coupling slip wheelset, it includes the support column to throw the material structure, the support column rigid coupling is in the backup pad top, the first mounting panel of support column top rigid coupling, first mounting panel one side is provided with first conveying assembly, first mounting panel top rigid coupling storage silo, storage silo inner chamber lateral wall rigid coupling deflector, first mounting panel bottom rigid coupling second mounting panel, second mounting panel one side is provided with second conveying assembly, second mounting panel top is provided with blocks the subassembly.

Further, first transmission assembly comprises conveyer belt subassembly and division board, the conveyer belt subassembly comprises two first transmission shafts and the first conveyer belt of parcel in first transmission shaft surface, and two first transmission shaft passes through first drive belt conveying connection, one of them first transmission shaft terminal surface rigid coupling has first motor, first conveyer belt surface rigid coupling has the division board of a plurality of equidistance distribution.

Furthermore, the second conveying assembly is composed of two second transmission shafts and a second conveying belt wrapped on the surfaces of the second transmission shafts, the two second transmission shafts are in conveying connection through a second conveying belt, and a second motor is fixedly connected to the end face of one of the second transmission shafts.

Further, the intercommunication mouth has been seted up to the storage silo bottom, storage silo inner chamber lateral wall rigid coupling has the deflector of two symmetric distributions, backup pad bottom rigid coupling has a plurality of slip wheelset, first conveying component both sides all are provided with first mounting panel, second conveying component both sides all are provided with the second mounting panel, just the equal rigid coupling in first mounting panel and second mounting panel bottom has a plurality of support column.

Further, the stopping assembly comprises a first baffle, a center column and a second baffle, the two ends of the center column are fixedly connected with the first baffle, the two first baffles are fixedly connected to the top of the second mounting plate, and the surface of the center column is fixedly connected with the second baffles which are distributed at equal intervals.

Further, including clean structure, clean structure is including the installation casing, installation casing rigid coupling is in the backup pad top, installation casing inner chamber bottom rigid coupling reference column, reference column surface sliding connection sliding plate, sliding plate bottom rigid coupling supporting spring, sliding plate one side rigid coupling first connecting plate, first connecting plate top rigid coupling cleaning brush, backup pad top rigid coupling has the fixed plate, spacing post of fixed plate one side rigid coupling, spacing post surface sliding connection moving plate, moving plate threaded connection is on two-way threaded rod surface, two-way threaded rod surface is rotated with the fixed plate and is connected, moving plate one side is provided with the second connecting plate, the clean sponge of second connecting plate top rigid coupling.

Furthermore, sliding plates are fixedly connected to two sides of the first connecting plate, a plurality of positioning holes are formed in the sliding plates, a plurality of positioning columns are fixedly connected to the bottom of the inner cavity of the installation shell, the top ends of the positioning columns penetrate through the positioning holes and are fixedly connected to the top of the inner cavity of the installation shell, and the supporting springs are sleeved on the surfaces of the positioning columns.

Further, backup pad top rigid coupling has the fixed plate of two symmetric distributions, and two spacing post connection through two symmetric distributions between the fixed plate, two-way threaded rod surface threaded connection has the movable clamp plate of two symmetric distributions, two the fixed slot has all been seted up to the relative one side of movable clamp plate, two the rotation mouth has been seted up to the fixed plate, two-way threaded rod both ends are run through and are rotated the mouth and extend to fixed plate one side, the equal rigid coupling in two-way threaded rod both ends has the knob.

Through the above-mentioned embodiment of this application, utilize structures such as deflector and block subassembly to convey, throw the material to egg or egg form product, solved present when carrying out egg or egg form product and throw the material efficiency lower, and egg or egg form product easily scatter when the conveying, gather together, make the packing efficiency lower problem of egg or egg form product, prevent that egg or egg form product from scattering, improve the packing efficiency of egg or egg form product.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.

FIG. 1 is an overall perspective view of one embodiment of the present application;

FIG. 2 is an overall internal schematic view of an embodiment of the present application;

fig. 3 is a schematic view illustrating a positional relationship between the fixing plate, the limiting post, the movable clamp plate and the bidirectional threaded rod according to an embodiment of the present disclosure.

In the figure: 1. backup pad, 2, slip wheelset, 3, the support column, 4, first mounting panel, 5, first conveying component, 6, the storage silo, 7, the deflector, 8, the second mounting panel, 9, second conveying component, 10, block the subassembly, 11, first baffle, 12, the center post, 13, the second baffle, 14, the installation casing, 15, the reference column, 16, the sliding plate, 17, supporting spring, 18, first connecting plate, 19, the cleaning brush, 20, the fixed plate, 21, spacing post, 22, the movable clamp plate, 23, two-way threaded rod, 24, the second connecting plate, 25, clean sponge.

Detailed Description

In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be used. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

In this application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. These terms are used primarily to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.

Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meaning of these terms in this application will be understood by those of ordinary skill in the art as appropriate.

Furthermore, the terms "mounted," "disposed," "provided," "connected," and "sleeved" are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.

The feeding device in the present embodiment may be applied to various packaging machines, for example, the following four-seal egg vacuum packaging machine is provided in the present embodiment, and the feeding device in the present embodiment may be applied to the following four-seal egg vacuum packaging machine.

The four-seal egg vacuum packaging machine comprises seal tracks, working press plates, an instrument operating platform and a vacuum pump, wherein a machine body protective shell is arranged on the upper portion of a movable roller and can be adjusted at any time, the instrument operating platform is arranged on the machine body protective shell and is used for setting parameters such as temperature, processing time and the like in advance, a main switch button is arranged on one side of the instrument operating platform and used for controlling the opening and closing of a machine, a working platform is arranged on the upper portion of the machine body protective shell, the seal tracks are arranged on the upper portion of the working platform and used for film paving, a vacuum film paving device is arranged on the upper portion of the seal tracks and used for film paving of eggs placed in advance, a compression rocker is arranged on one side of each seal track, the working press plates are arranged on the upper portions of the compression rockers, the compression rockers drive the working press plates to move synchronously, auxiliary handles are arranged on two sides of the working press plates, and a vacuum exhaust device is arranged in the machine body protective shell, a vacuum pump is installed on one side of the vacuum exhaust device, residual gas in the film is exhausted by the vacuum pump, and a heat dissipation array hole is installed on one side of the vacuum pump, so that heat dissipation of the machine body is facilitated, and the service life is prolonged.

Of course, the present embodiment can be applied to packing machines of other structures. Here, description is not repeated, and the feeding device according to the embodiment of the present application is described below.

Please refer to fig. 1-3, an egg or egg-shaped feeding device for a packaging machine comprises a support plate 1 and a feeding structure, wherein a sliding wheel set 2 is fixedly connected to the bottom of the support plate 1, the sliding wheel set 2 can be moved conveniently to feed the device, the feeding structure comprises a support column 3, the support column 3 is fixedly connected to the top of the support plate 1, the top end of the support column 3 is fixedly connected to a first mounting plate 4, a first conveying component 5 is arranged on one side of the first mounting plate 4, the top of the first mounting plate 4 is fixedly connected to a storage bin 6, a guide plate 7 is fixedly connected to the side wall of the inner cavity of the storage bin 6, a second mounting plate 8 is fixedly connected to the bottom of the first mounting plate 4, a second conveying component 9 is arranged on one side of the second mounting plate 8, and a blocking component 10 is arranged on the top of the second mounting plate 8.

Can be convenient for convey egg or egg form product through first conveying subassembly 5 and second conveying subassembly 9 isotructure, be convenient for throw the material to packagine machine, and can prevent through second baffle 13 and division board that egg or egg form product are in disorder, gather together, the packagine machine's of being convenient for packing, improve the efficiency of throwing the material and the efficiency of packagine machine packing.

The first conveying assembly 5 is composed of a conveying belt assembly and partition plates, the conveying belt assembly is composed of two first transmission shafts and a first conveying belt wrapped on the surfaces of the first transmission shafts, the two first transmission shafts are in transmission connection through the first conveying belt, a first motor is fixedly connected to the end face of one first transmission shaft, and a plurality of partition plates distributed at equal intervals are fixedly connected to the surfaces of the first conveying belts; the second conveying assembly 9 is composed of two second transmission shafts and a second conveying belt wrapped on the surfaces of the second transmission shafts, the two second transmission shafts are in conveying connection through the second conveying belt, and a second motor is fixedly connected to the end face of one of the second transmission shafts; the bottom of the storage bin 6 is provided with a communication port, the side wall of an inner cavity of the storage bin 6 is fixedly connected with two guide plates 7 which are symmetrically distributed, the bottom of the supporting plate 1 is fixedly connected with a plurality of sliding wheel sets 2, two sides of the first conveying assembly 5 are respectively provided with a first mounting plate 4, two sides of the second conveying assembly 9 are respectively provided with a second mounting plate 8, the bottoms of the first mounting plate 4 and the second mounting plate 8 are respectively fixedly connected with a plurality of supporting columns 3, and the supporting columns 3 can support the first mounting plate 4 and the second mounting plate 8; the blocking assembly 10 comprises a first baffle plate 11, a central column 12 and a second baffle plate 13, the first baffle plates 11 are fixedly connected to two ends of the central column 12, the two first baffle plates 11 are fixedly connected to the top of the second mounting plate 8, the surface of the central column 12 is fixedly connected with a plurality of second baffle plates 13 which are distributed at equal intervals, and eggs or egg-shaped products can be separated through the second baffle plates 13; the cleaning structure comprises a cleaning structure, the cleaning structure comprises a mounting shell 14, the mounting shell 14 is fixedly connected to the top of a support plate 1, the bottom of an inner cavity of the mounting shell 14 is fixedly connected with a positioning column 15, the surface of the positioning column 15 is slidably connected with a sliding plate 16, the bottom of the sliding plate 16 is fixedly connected with a supporting spring 17, one side of the sliding plate 16 is fixedly connected with a first connecting plate 18, the top of the first connecting plate 18 is fixedly connected with a cleaning brush 19, the top of the support plate 1 is fixedly connected with a fixed plate 20, one side of the fixed plate 20 is fixedly connected with a limiting column 21, the surface of the limiting column 21 is slidably connected with a movable clamping plate 22, the movable clamping plate 22 is in threaded connection with the surface of a bidirectional threaded rod 23, the surface of the bidirectional threaded rod 23 is rotatably connected with the fixed plate 20, one side of the movable clamping plate 22 is provided with a second connecting plate 24, the top of the second connecting plate 24 is fixedly connected with a cleaning sponge 25, and a second conveying component 9 can be cleaned through the cleaning structure, preventing the packaging of eggs or egg-like products from being affected; sliding plates 16 are fixedly connected to two sides of the first connecting plate 18, a plurality of positioning holes are formed in each sliding plate 16, a plurality of positioning columns 15 are fixedly connected to the bottom of the inner cavity of the mounting shell 14, the top ends of the positioning columns 15 penetrate through the positioning holes and are fixedly connected to the top of the inner cavity of the mounting shell 14, supporting springs 17 are sleeved on the surfaces of the positioning columns 15, and the supporting springs 17 can enable the cleaning brushes 19 to be tightly attached to the second transmission belts of the second transmission assemblies 9, so that the cleaning brushes 19 can be used for cleaning the second transmission belts conveniently; 1 top rigid coupling of backup pad has two symmetric distribution's fixed plate 20, and two connect through two symmetric distribution's spacing post 21 between the fixed plate 20, can inject the removal orbit of moving splint 22 through

spacing post

21, 23 surperficial threaded connection of two-way threaded rod has two symmetric distribution's moving splint 22, two the fixed slot has all been seted up to moving splint 22 relative one side, two the rotation mouth has been seted up to

fixed plate

20, 23 both ends of two-way threaded rod run through the rotation mouth and extend to fixed plate 20 one side, the equal rigid coupling in 23 both ends of two-way threaded rod has the knob, can be convenient for rotate two-way threaded rod 23 through the knob.

When the egg feeding device is used, electrical elements appearing in the egg feeding device are externally connected with a power supply and a control switch when the egg feeding device is used, firstly, eggs or egg-shaped products can be placed through the storage bin 6, at the moment, the eggs or the egg-shaped products are guided by the guide plate 7, the eggs or the egg-shaped products slide to the first conveying assembly 5 from a communication port formed in the bottom of the storage bin 6, at the moment, the eggs or the egg-shaped products are separated by the partition plate, the eggs or the egg-shaped products are conveyed to the second conveying assembly 9 by the first conveying assembly 5, at the moment, the eggs or the egg-shaped products are separated by the second baffle plate 13, the eggs or the egg-shaped products are prevented from being scattered and gathered, then the eggs or the egg-shaped products are conveyed to the packaging machine by the second conveying assembly 9 for packaging, the feeding efficiency and the packaging efficiency of the packaging machine are improved, when the second conveying assembly 9 is operated, the slide plate 16 and the first link plate 18 are supported by the support spring 17 so that the cleaning brush 19 is closely attached to the second belt of the second conveyor assembly 9, the second belt is swept by the cleaning brush 19, then the second conveyor belt is cleaned by the cleaning sponge 25, so that the second conveyor assembly 9 is cleaner when in use, dirt such as dust on the second conveyor assembly 9 is prevented from being adhered to the eggs or the egg-shaped products, the package of the eggs or the egg-shaped products is prevented from being influenced, and the two-way threaded rod 23 can be rotated to drive the movable clamping plate 22 to move towards two sides along the limiting column 21, so that the second connecting plate 24 slides out from the fixed groove formed in the movable clamping plate 22, thereby facilitating the removal of the second connecting plate 24 and the cleaning sponge 25, facilitating the replacement of the cleaning sponge 25, the cleaning sponge 25 can then be installed in the opposite manner, facilitating installation and removal of the cleaning sponge 25.

The application has the advantages that:

1. the egg-shaped or egg-shaped product conveying device is simple in structure, egg-shaped or egg-shaped products can be conveyed conveniently through the first conveying assembly, the second conveying assembly and the like, feeding of a packaging machine is facilitated, the egg-shaped or egg-shaped products can be prevented from being scattered and gathered together through the second baffle and the partition plate, packaging of the packaging machine is facilitated, and feeding efficiency and packaging efficiency of the packaging machine are improved;

2. this application is rational in infrastructure, can clean second conveying assembly through first connecting plate, can clean second conveying assembly through clean sponge, prevents that second conveying assembly from going up the dirty such as adhesion dust, prevents to influence the packing of eggs or egg form product.

It is well within the skill of those in the art to implement, without undue experimentation, the present application is not directed to software and process improvements, as they relate to circuits and electronic components and modules.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. The utility model provides an egg or egg form feeding equipment that packagine machine used which characterized in that: including backup pad (1) and throw the material structure, backup pad (1) bottom rigid coupling slip wheelset (2), it includes support column (3) to throw the material structure, support column (3) rigid coupling in backup pad (1) top, support column (3) top rigid coupling first mounting panel (4), first mounting panel (4) one side is provided with first conveying subassembly (5), first mounting panel (4) top rigid coupling storage silo (6), storage silo (6) inner chamber lateral wall rigid coupling deflector (7), first mounting panel (4) bottom rigid coupling second mounting panel (8), second mounting panel (8) one side is provided with second conveying subassembly (9), second mounting panel (8) top is provided with blocks subassembly (10).

2. Egg or egg-shaped feeding equipment for a packaging machine according to claim 1, characterized in that: first transmission assembly (5) comprise conveyer belt subassembly and division board, the conveyer belt subassembly comprises two first transmission shafts and the first conveyer belt of parcel in first transmission shaft surface, and two first transmission shaft passes through first drive belt conveying connection, one of them first transmission shaft terminal surface rigid coupling has first motor, first conveyer belt surface rigid coupling has the division board of a plurality of equidistance distribution.

3. Egg or egg-shaped feeding equipment for a packaging machine according to claim 1, characterized in that: the second conveying assembly (9) is composed of two second transmission shafts and a second conveying belt wrapped on the surfaces of the second transmission shafts, the second transmission shafts are in conveying connection through second conveying belts, and one end face of each second transmission shaft is fixedly connected with a second motor.

4. Egg or egg-shaped feeding equipment for a packaging machine according to claim 1, characterized in that: the intercommunication mouth has been seted up to storage silo (6) bottom, storage silo (6) inner chamber lateral wall rigid coupling has deflector (7) of two symmetric distributions, backup pad (1) bottom rigid coupling has a plurality of slip wheelset (2), first conveying subassembly (5) both sides all are provided with first mounting panel (4), second conveying subassembly (9) both sides all are provided with second mounting panel (8), just the equal rigid coupling in first mounting panel (4) and second mounting panel (8) bottom has a plurality of support column (3).

5. Egg or egg-shaped feeding equipment for a packaging machine according to claim 1, characterized in that: the blocking assembly (10) comprises a first baffle (11), a center column (12) and a second baffle (13), wherein the first baffle (11) is fixedly connected to the two ends of the center column (12), the two first baffles (11) are fixedly connected to the top of the second mounting plate (8), and the second baffles (13) are distributed at equal intervals on the surface of the center column (12).

6. Egg or egg-shaped feeding equipment for a packaging machine according to claim 1, characterized in that: comprises a cleaning structure, the cleaning structure comprises an installation shell (14), the installation shell (14) is fixedly connected with the top of a support plate (1), the bottom of an inner cavity of the installation shell (14) is fixedly connected with a positioning column (15), the surface of the positioning column (15) is slidably connected with a sliding plate (16), the bottom of the sliding plate (16) is fixedly connected with a supporting spring (17), one side of the sliding plate (16) is fixedly connected with a first connecting plate (18), the top of the first connecting plate (18) is fixedly connected with a cleaning brush (19), the top of the support plate (1) is fixedly connected with a fixed plate (20), one side of the fixed plate (20) is fixedly connected with a limiting column (21), the surface of the limiting column (21) is slidably connected with a movable clamping plate (22), the movable clamping plate (22) is in threaded connection with the surface of a bidirectional threaded rod (23), and the surface of the bidirectional threaded rod (23) is rotatably connected with the fixed plate (20), a second connecting plate (24) is arranged on one side of the movable clamping plate (22), and the top of the second connecting plate (24) is fixedly connected with a cleaning sponge (25).

7. Egg or egg-shaped feeding equipment for a packaging machine according to claim 6, characterized in that: all the two sides of the first connecting plate (18) are fixedly connected with sliding plates (16), a plurality of positioning holes are formed in the sliding plates (16), a plurality of positioning columns (15) are fixedly connected to the bottom of an inner cavity of the mounting shell (14), the top ends of the positioning columns (15) penetrate through the positioning holes and are fixedly connected to the top of the inner cavity of the mounting shell (14), and the surfaces of the positioning columns (15) are sleeved with supporting springs (17).

8. Egg or egg-shaped feeding equipment for a packaging machine according to claim 6, characterized in that: backup pad (1) top rigid coupling has fixed plate (20) of two symmetric distributions, and two connect through spacing post (21) of two symmetric distributions between fixed plate (20), two-way threaded rod (23) surface threaded connection has movable clamp plate (22) of two symmetric distributions, two the fixed slot has all been seted up to movable clamp plate (22) relative one side, two the rotation mouth has been seted up in fixed plate (20), two-way threaded rod (23) both ends are run through and are rotated the mouth and extend to fixed plate (20) one side, the equal rigid coupling in two-way threaded rod (23) both ends has the knob.